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Application.xml
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Application.xml
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<Type Name="Application" FullName="System.Windows.Application">
<TypeSignature Language="C#" Value="public class Application : System.Windows.Threading.DispatcherObject" FrameworkAlternate="netframework-3.0;netframework-3.5" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi Application extends System.Windows.Threading.DispatcherObject" FrameworkAlternate="netframework-3.0;netframework-3.5" />
<TypeSignature Language="DocId" Value="T:System.Windows.Application" />
<TypeSignature Language="VB.NET" Value="Public Class Application
Inherits DispatcherObject" FrameworkAlternate="netframework-3.0;netframework-3.5" />
<TypeSignature Language="F#" Value="type Application = class
 inherit DispatcherObject" FrameworkAlternate="netframework-3.0;netframework-3.5" />
<TypeSignature Language="C++ CLI" Value="public ref class Application : System::Windows::Threading::DispatcherObject" FrameworkAlternate="netframework-3.0;netframework-3.5" />
<TypeSignature Language="C#" Value="public class Application : System.Windows.Threading.DispatcherObject, System.Windows.Markup.IQueryAmbient" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi Application extends System.Windows.Threading.DispatcherObject implements class System.Windows.Markup.IQueryAmbient" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<TypeSignature Language="VB.NET" Value="Public Class Application
Inherits DispatcherObject
Implements IQueryAmbient" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<TypeSignature Language="F#" Value="type Application = class
 inherit DispatcherObject
 interface IQueryAmbient" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<TypeSignature Language="C++ CLI" Value="public ref class Application : System::Windows::Threading::DispatcherObject, System::Windows::Markup::IQueryAmbient" FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit Application extends System.Windows.Threading.DispatcherObject implements class System.Windows.Markup.IQueryAmbient" FrameworkAlternate="windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Base>
<BaseTypeName>System.Windows.Threading.DispatcherObject</BaseTypeName>
</Base>
<Interfaces>
<Interface FrameworkAlternate="netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0">
<InterfaceName>System.Windows.Markup.IQueryAmbient</InterfaceName>
</Interface>
</Interfaces>
<Docs>
<summary>Encapsulates a Windows Presentation Foundation application.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Windows.Application> is a class that encapsulates WPF application-specific functionality, including the following:
- **Application Lifetime**: <xref:System.Windows.Application.Activated>, <xref:System.Windows.Application.Current%2A>, <xref:System.Windows.Application.Deactivated>, <xref:System.Windows.Application.DispatcherUnhandledException>, <xref:System.Windows.Application.Exit>, <xref:System.Windows.Application.Run%2A>, <xref:System.Windows.Application.SessionEnding>, <xref:System.Windows.Application.Shutdown%2A>, <xref:System.Windows.Application.ShutdownMode%2A>, <xref:System.Windows.Application.Startup>.
- **Application-Scope Window, Property, and Resource Management**: <xref:System.Windows.Application.FindResource%2A>, <xref:System.Windows.Application.GetContentStream%2A>, <xref:System.Windows.Application.GetResourceStream%2A>, <xref:System.Windows.Application.LoadComponent%2A>, <xref:System.Windows.Application.MainWindow%2A>, <xref:System.Windows.Application.Properties%2A>, <xref:System.Windows.Application.Resources%2A>, <xref:System.Windows.Application.StartupUri%2A>, <xref:System.Windows.Application.Windows%2A>.
- **Command-Line Parameter and Exit Code Processing**: <xref:System.Windows.Application.Startup?displayProperty=nameWithType>, <xref:System.Windows.Application.Exit?displayProperty=nameWithType>, <xref:System.Windows.Application.Shutdown%2A?displayProperty=nameWithType>.
- **Navigation**: <xref:System.Windows.Application.FragmentNavigation>, <xref:System.Windows.Application.LoadCompleted>, <xref:System.Windows.Application.Navigated>, <xref:System.Windows.Application.Navigating>, <xref:System.Windows.Application.NavigationProgress>, <xref:System.Windows.Application.NavigationStopped>, <xref:System.Windows.Application.NavigationFailed>, <xref:System.Windows.Application.SetCookie%2A>, <xref:System.Windows.Application.GetCookie%2A>.
<xref:System.Windows.Application> implements the singleton pattern to provide shared access to its window, property, and resource scope services. Consequently, only one instance of the <xref:System.Windows.Application> class can be created per <xref:System.AppDomain>.
You can implement an <xref:System.Windows.Application> using markup, markup and code-behind, or code. If <xref:System.Windows.Application> is implemented with markup, whether markup or markup and code-behind, the markup file must be configured as an Microsoft build engine (MSBuild) `ApplicationDefinition` item.
> [!NOTE]
> A standalone application does not require an <xref:System.Windows.Application> object; it is possible to implement a custom `static` entry point method (`Main`) that opens a window without creating an instance of <xref:System.Windows.Application>. However, XAML browser applications (XBAPs) require an <xref:System.Windows.Application> object.
## Examples
The following example shows how a standard application is defined using only markup:
:::code language="xaml" source="~/snippets/csharp/System.Windows/Application/Overview/AppMarkup.xaml" id="Snippetapplicationmarkup":::
The following example shows how a standard application is defined using only code:
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/Overview/AppCode.cs" id="Snippetapplicationcode":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationSnippets/visualbasic/appcode.vb" id="Snippetapplicationcode":::
The following example shows how a standard application is defined using a combination of markup and code-behind.
:::code language="xaml" source="~/snippets/csharp/System.Windows/Application/Overview/App.xaml" id="Snippetapplicationxaml":::
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/Overview/App.xaml.cs" id="Snippetapplicationcodebehind":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationSnippets/visualbasic/application.xaml.vb" id="Snippetapplicationcodebehind":::
]]></format>
</remarks>
<threadsafe>The public <see langword="static" /> (<see langword="Shared" /> in Visual Basic) members of this type are thread safe. In addition, the <see cref="M:System.Windows.Application.FindResource(System.Object)" /> and <see cref="M:System.Windows.Application.TryFindResource(System.Object)" /> methods and the <see cref="P:System.Windows.Application.Properties" /> and <see cref="P:System.Windows.Application.Resources" /> properties are thread safe.</threadsafe>
<altmember cref="T:System.Windows.Window" />
</Docs>
<Members>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public Application ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.#ctor" />
<MemberSignature Language="VB.NET" Value="Public Sub New ()" />
<MemberSignature Language="C++ CLI" Value="public:
 Application();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Security.SecurityCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecurityCritical>]</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.Windows.Application" /> class.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
Only one instance of the <xref:System.Windows.Application> class can be created per <xref:System.AppDomain>, to ensure shared access to a single set of application-scope window, property, and resource data. Consequently, the parameterless constructor of the <xref:System.Windows.Application> class detects whether the instance being initialized is the first instance in an <xref:System.AppDomain>; if it is not, an <xref:System.InvalidOperationException> is thrown.
The <xref:System.Windows.Application> object for the current <xref:System.AppDomain> is exposed from the static <xref:System.Windows.Application.Current%2A> property.
]]></format>
</remarks>
<exception cref="T:System.InvalidOperationException">More than one instance of the <see cref="T:System.Windows.Application" /> class is created per <see cref="T:System.AppDomain" />.</exception>
</Docs>
</Member>
<Member MemberName="Activated">
<MemberSignature Language="C#" Value="public event EventHandler Activated;" />
<MemberSignature Language="ILAsm" Value=".event class System.EventHandler Activated" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.Activated" />
<MemberSignature Language="VB.NET" Value="Public Custom Event Activated As EventHandler " FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<MemberSignature Language="F#" Value="member this.Activated : EventHandler " Usage="member this.Activated : System.EventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event EventHandler ^ Activated;" />
<MemberSignature Language="VB.NET" Value="Public Event Activated As EventHandler " FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.EventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs when an application becomes the foreground application.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A Windows Presentation Foundation application that has one or more open windows is activated (becomes the foreground application) when one of the windows is activated for the first time since the application was launched, or when one of the windows is activated while the application is inactive: Specifically, activation occurs when:
- An application opens its first window.
- A user switches to the application by using ALT+TAB or by using Task Manager.
- A user clicks the taskbar button for one of the windows in an application.
Applications that need to detect when they activate can handle the <xref:System.Windows.Application.Activated> event.
After an application is first activated, it may be deactivated and reactivated many times during its lifetime. If an application's behavior or state depends on its activation state, it can handle both <xref:System.Windows.Application.Activated> and <xref:System.Windows.Application.Deactivated> events to determine which activation state it's in.
Once an application becomes active, <xref:System.Windows.Application.Activated> will not be raised again until the application is deactivated, irrespective of how many windows within an application are activated while the application is active.
<xref:System.Windows.Application.Activated> is not raised for XAML browser applications (XBAPs).
## Examples
The following example shows how to detect when a standalone application activates and deactivates.
:::code language="xaml" source="~/snippets/csharp/System.Windows/Application/Activated/App.xaml" id="Snippetdetectactivationstatexaml":::
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/Activated/App.xaml.cs" id="Snippetdetectactivationstatecodebehind":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationActivationSnippets/visualbasic/application.xaml.vb" id="Snippetdetectactivationstatecodebehind":::
]]></format>
</remarks>
<altmember cref="M:System.Windows.Application.OnActivated(System.EventArgs)" />
<altmember cref="E:System.Windows.Application.Deactivated" />
</Docs>
</Member>
<Member MemberName="Current">
<MemberSignature Language="C#" Value="public static System.Windows.Application Current { get; }" />
<MemberSignature Language="ILAsm" Value=".property class System.Windows.Application Current" />
<MemberSignature Language="DocId" Value="P:System.Windows.Application.Current" />
<MemberSignature Language="VB.NET" Value="Public Shared ReadOnly Property Current As Application" />
<MemberSignature Language="F#" Value="static member Current : System.Windows.Application" Usage="System.Windows.Application.Current" />
<MemberSignature Language="C++ CLI" Value="public:
 static property System::Windows::Application ^ Current { System::Windows::Application ^ get(); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[get: System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
<AttributeName Language="F#">[<get: System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Windows.Application</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets the <see cref="T:System.Windows.Application" /> object for the current <see cref="T:System.AppDomain" />.</summary>
<value>The <see cref="T:System.Windows.Application" /> object for the current <see cref="T:System.AppDomain" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Windows.Application> is a per-<xref:System.AppDomain> singleton type that implements the static <xref:System.Windows.Application.Current%2A> property to provide shared access to the <xref:System.Windows.Application> instance for the current <xref:System.AppDomain>. This design guarantees that state managed by <xref:System.Windows.Application>, including shared resources and state, is available from a single, shared location.
This property is thread safe and is available from any thread.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="Deactivated">
<MemberSignature Language="C#" Value="public event EventHandler Deactivated;" />
<MemberSignature Language="ILAsm" Value=".event class System.EventHandler Deactivated" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.Deactivated" />
<MemberSignature Language="VB.NET" Value="Public Custom Event Deactivated As EventHandler " FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<MemberSignature Language="F#" Value="member this.Deactivated : EventHandler " Usage="member this.Deactivated : System.EventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event EventHandler ^ Deactivated;" />
<MemberSignature Language="VB.NET" Value="Public Event Deactivated As EventHandler " FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.EventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs when an application stops being the foreground application.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A Windows Presentation Foundation application that has one or more open windows deactivates (stops being the foreground application) when a user does the following:
- Switches to another application by using ALT+TAB or by using Task Manager.
- Clicks the taskbar button for a window in another application.
Applications that need to detect deactivation can handle the <xref:System.Windows.Application.Deactivated> event.
After an application is first activated, it may be deactivated and reactivated many times during its lifetime. If an application's behavior or state depends on its activation state, it can handle both <xref:System.Windows.Application.Deactivated> and <xref:System.Windows.Application.Activated> events to determine which state it's in.
<xref:System.Windows.Application.Deactivated> is not raised for XAML browser applications (XBAPs).
## Examples
The following example shows how to detect when a standalone application deactivates and activates.
:::code language="xaml" source="~/snippets/csharp/System.Windows/Application/Activated/App.xaml" id="Snippetdetectactivationstatexaml":::
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/Activated/App.xaml.cs" id="Snippetdetectactivationstatecodebehind":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationActivationSnippets/visualbasic/application.xaml.vb" id="Snippetdetectactivationstatecodebehind":::
]]></format>
</remarks>
<altmember cref="M:System.Windows.Application.OnDeactivated(System.EventArgs)" />
<altmember cref="E:System.Windows.Application.Activated" />
</Docs>
</Member>
<Member MemberName="DispatcherUnhandledException">
<MemberSignature Language="C#" Value="public event System.Windows.Threading.DispatcherUnhandledExceptionEventHandler DispatcherUnhandledException;" />
<MemberSignature Language="ILAsm" Value=".event class System.Windows.Threading.DispatcherUnhandledExceptionEventHandler DispatcherUnhandledException" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.DispatcherUnhandledException" />
<MemberSignature Language="VB.NET" Value="Public Custom Event DispatcherUnhandledException As DispatcherUnhandledExceptionEventHandler " />
<MemberSignature Language="F#" Value="member this.DispatcherUnhandledException : System.Windows.Threading.DispatcherUnhandledExceptionEventHandler " Usage="member this.DispatcherUnhandledException : System.Windows.Threading.DispatcherUnhandledExceptionEventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event System::Windows::Threading::DispatcherUnhandledExceptionEventHandler ^ DispatcherUnhandledException;" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Windows.Threading.DispatcherUnhandledExceptionEventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs when an exception is thrown by an application but not handled.</summary>
<remarks>
<format type="text/markdown">< overview.
The <xref:System.Windows.Application.DispatcherUnhandledException> event handler is passed a <xref:System.Windows.Threading.DispatcherUnhandledExceptionEventArgs> argument that contains contextual information regarding the exception, including:
- The exception (<xref:System.Windows.Threading.DispatcherUnhandledExceptionEventArgs.Exception%2A>).
- The <xref:System.Windows.Threading.Dispatcher> from which it originated (<xref:System.Windows.Threading.DispatcherEventArgs.Dispatcher%2A>).
You can use this information to determine whether an exception is recoverable or not. A recoverable exception might be a <xref:System.IO.FileNotFoundException>, for example, while an unrecoverable exception might be a <xref:System.StackOverflowException>, for example.
When you process an unhandled exception from <xref:System.Windows.Application.DispatcherUnhandledException>, and you don't want WPF to continue processing it, you need to set the <xref:System.Windows.Threading.DispatcherUnhandledExceptionEventArgs.Handled%2A> property to `true`.
Unlike the other events that <xref:System.Windows.Application> raises, <xref:System.Windows.Application.DispatcherUnhandledException> does not have a matching protected virtual implementation (OnDispatcherUnhandledException). Consequently, classes that derive from <xref:System.Windows.Application> must always register an event handler with <xref:System.Windows.Application.DispatcherUnhandledException> to process unhandled exceptions.
## Examples
The following example shows how to process unhandled exceptions by handling the <xref:System.Windows.Application.DispatcherUnhandledException> event.
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/DispatcherUnhandledException/App.xaml.cs":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationDispatcherUnhandledExceptionSnippets/visualbasic/application.xaml.vb":::
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="Exit">
<MemberSignature Language="C#" Value="public event System.Windows.ExitEventHandler Exit;" />
<MemberSignature Language="ILAsm" Value=".event class System.Windows.ExitEventHandler Exit" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.Exit" />
<MemberSignature Language="VB.NET" Value="Public Custom Event Exit As ExitEventHandler " />
<MemberSignature Language="F#" Value="member this.Exit : System.Windows.ExitEventHandler " Usage="member this.Exit : System.Windows.ExitEventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event System::Windows::ExitEventHandler ^ Exit;" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Windows.ExitEventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs just before an application shuts down and cannot be canceled.</summary>
<remarks>
<format type="text/markdown"><.
## Examples
The following example demonstrates how to:
- Handle the <xref:System.Windows.Application.Exit> event.
- Inspect and update the <xref:System.Windows.ExitEventArgs.ApplicationExitCode%2A> property of the <xref:System.Windows.ExitEventArgs>.
- Write an entry to an application log in isolated storage.
- Persist the application state to isolated storage.
:::code language="xaml" source="~/snippets/csharp/System.Windows/Application/Exit/App.xaml" id="Snippethandleexitxaml":::
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/Exit/App.xaml.cs" id="Snippethandleexitcodebehind":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationExitSnippets/visualbasic/application.xaml.vb" id="Snippethandleexitcodebehind":::
]]></format>
</remarks>
<altmember cref="M:System.Windows.Application.OnExit(System.Windows.ExitEventArgs)" />
<altmember cref="E:System.Windows.Application.Startup" />
<altmember cref="T:System.IO.IsolatedStorage.IsolatedStorage" />
</Docs>
</Member>
<Member MemberName="FindResource">
<MemberSignature Language="C#" Value="public object FindResource (object resourceKey);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig instance object FindResource(object resourceKey) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.FindResource(System.Object)" />
<MemberSignature Language="VB.NET" Value="Public Function FindResource (resourceKey As Object) As Object" />
<MemberSignature Language="F#" Value="member this.FindResource : obj -> obj" Usage="application.FindResource resourceKey" />
<MemberSignature Language="C++ CLI" Value="public:
 System::Object ^ FindResource(System::Object ^ resourceKey);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Object</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="resourceKey" Type="System.Object" />
</Parameters>
<Docs>
<param name="resourceKey">The name of the resource to find.</param>
<summary>Searches for a user interface (UI) resource, such as a <see cref="T:System.Windows.Style" /> or <see cref="T:System.Windows.Media.Brush" />, with the specified key, and throws an exception if the requested resource is not found (see <see href="https://learn.microsoft.com/dotnet/framework/wpf/advanced/xaml-resources">XAML Resources</see>).</summary>
<returns>The requested resource object. If the requested resource is not found, a <see cref="T:System.Windows.ResourceReferenceKeyNotFoundException" /> is thrown.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Windows.Application.FindResource%2A> will first look in application-scope resources for the specified resource. Application-scope resources are managed by <xref:System.Windows.Application>, and are exposed from the <xref:System.Windows.Application.Resources%2A> property. If the specified resource is not found in the set of application-scope resources, <xref:System.Windows.Application.FindResource%2A> then next searches the system resources. System resources are shell resources defined by the user, and include colors, fonts, and shell configurations. These are exposed from the <xref:System.Windows.SystemColors>, <xref:System.Windows.SystemFonts>, and <xref:System.Windows.SystemParameters> types, respectively, as static properties. To use <xref:System.Windows.Application.FindResource%2A> to acquire them, these types also expose resource key properties that are designed to be passed to <xref:System.Windows.Application.FindResource%2A>; for example, <xref:System.Windows.SystemParameters.IconWidthKey%2A>.
Because <xref:System.Windows.Application.FindResource%2A> returns an object, you must cast the returned value to the appropriate type if the resource is found.
> [!IMPORTANT]
> If you call this method for a key that cannot be found, an exception is thrown. If you do not want to handle exceptions that result from calling <xref:System.Windows.Application.FindResource%2A>, call <xref:System.Windows.Application.TryFindResource%2A> instead; <xref:System.Windows.Application.TryFindResource%2A> returns a `null` reference when a requested resource cannot be found, and does not throw an exception.
This method is thread safe and can be called from any thread.
## Examples
The following example shows how to use <xref:System.Windows.Application.FindResource%2A> to find a resource, and to handle <xref:System.Windows.ResourceReferenceKeyNotFoundException> if the resource is not found.
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/FindResource/MainWindow.xaml.cs" id="Snippetapplicationcallfindresourcecodebehind":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationFindResourceSnippets/visualbasic/mainwindow.xaml.vb" id="Snippetapplicationcallfindresourcecodebehind":::
]]></format>
</remarks>
<exception cref="T:System.Windows.ResourceReferenceKeyNotFoundException">The resource cannot be found.</exception>
<altmember cref="M:System.Windows.Application.TryFindResource(System.Object)" />
</Docs>
</Member>
<Member MemberName="FragmentNavigation">
<MemberSignature Language="C#" Value="public event System.Windows.Navigation.FragmentNavigationEventHandler FragmentNavigation;" />
<MemberSignature Language="ILAsm" Value=".event class System.Windows.Navigation.FragmentNavigationEventHandler FragmentNavigation" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.FragmentNavigation" />
<MemberSignature Language="VB.NET" Value="Public Custom Event FragmentNavigation As FragmentNavigationEventHandler " FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<MemberSignature Language="F#" Value="member this.FragmentNavigation : System.Windows.Navigation.FragmentNavigationEventHandler " Usage="member this.FragmentNavigation : System.Windows.Navigation.FragmentNavigationEventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event System::Windows::Navigation::FragmentNavigationEventHandler ^ FragmentNavigation;" />
<MemberSignature Language="VB.NET" Value="Public Event FragmentNavigation As FragmentNavigationEventHandler " FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Windows.Navigation.FragmentNavigationEventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs when a navigator in the application begins navigation to a content fragment, Navigation occurs immediately if the desired fragment is in the current content, or after the source XAML content has been loaded if the desired fragment is in different content.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A navigator is either a <xref:System.Windows.Navigation.NavigationWindow> or a <xref:System.Windows.Controls.Frame>.
See <xref:System.Windows.Navigation.NavigationService.FragmentNavigation?displayProperty=nameWithType>.
]]></format>
</remarks>
<altmember cref="E:System.Windows.Application.Navigated" />
<altmember cref="E:System.Windows.Application.Navigating" />
<altmember cref="E:System.Windows.Application.LoadCompleted" />
<altmember cref="E:System.Windows.Application.NavigationProgress" />
<altmember cref="E:System.Windows.Application.NavigationStopped" />
<altmember cref="E:System.Windows.Application.NavigationFailed" />
</Docs>
</Member>
<Member MemberName="GetContentStream">
<MemberSignature Language="C#" Value="public static System.Windows.Resources.StreamResourceInfo GetContentStream (Uri uriContent);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Windows.Resources.StreamResourceInfo GetContentStream(class System.Uri uriContent) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.GetContentStream(System.Uri)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetContentStream (uriContent As Uri) As StreamResourceInfo" />
<MemberSignature Language="F#" Value="static member GetContentStream : Uri -> System.Windows.Resources.StreamResourceInfo" Usage="System.Windows.Application.GetContentStream uriContent" />
<MemberSignature Language="C++ CLI" Value="public:
 static System::Windows::Resources::StreamResourceInfo ^ GetContentStream(Uri ^ uriContent);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Security.SecurityCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecurityCritical>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Windows.Resources.StreamResourceInfo</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="uriContent" Type="System.Uri" />
</Parameters>
<Docs>
<param name="uriContent">The relative <see cref="T:System.Uri" /> that maps to a loose resource.</param>
<summary>Returns a resource stream for a content data file that is located at the specified <see cref="T:System.Uri" /> (see <see href="https://learn.microsoft.com/dotnet/framework/wpf/app-development/wpf-application-resource-content-and-data-files">WPF Application Resource, Content, and Data Files</see>).</summary>
<returns>A <see cref="T:System.Windows.Resources.StreamResourceInfo" /> that contains a content data file that is located at the specified <see cref="T:System.Uri" />. If a loose resource is not found, null is returned.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is not thread safe.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetContentStream(System.Uri)" /> is null.</exception>
<exception cref="T:System.ArgumentException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetContentStream(System.Uri)" /> is an absolute <see cref="T:System.Uri" />.</exception>
<altmember cref="M:System.Windows.Application.GetResourceStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" />
<altmember cref="Overload:System.Windows.Application.LoadComponent" />
</Docs>
</Member>
<Member MemberName="GetCookie">
<MemberSignature Language="C#" Value="public static string GetCookie (Uri uri);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig string GetCookie(class System.Uri uri) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.GetCookie(System.Uri)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetCookie (uri As Uri) As String" />
<MemberSignature Language="F#" Value="static member GetCookie : Uri -> string" Usage="System.Windows.Application.GetCookie uri" />
<MemberSignature Language="C++ CLI" Value="public:
 static System::String ^ GetCookie(Uri ^ uri);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.String</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="uri" Type="System.Uri" />
</Parameters>
<Docs>
<param name="uri">The <see cref="T:System.Uri" /> that specifies the location for which a cookie was created.</param>
<summary>Retrieves a cookie for the location specified by a <see cref="T:System.Uri" />.</summary>
<returns>A <see cref="T:System.String" /> value, if the cookie exists; otherwise, a <see cref="T:System.ComponentModel.Win32Exception" /> is thrown.</returns>
<remarks>
<format type="text/markdown"><.
]]></format>
</remarks>
<exception cref="T:System.ComponentModel.Win32Exception">A Win32 error is raised by the <see langword="InternetGetCookie" /> function (called by <see cref="M:System.Windows.Application.GetCookie(System.Uri)" />) if a problem occurs when attempting to retrieve the specified cookie.</exception>
<altmember cref="M:System.Windows.Application.SetCookie(System.Uri,System.String)" />
</Docs>
</Member>
<Member MemberName="GetRemoteStream">
<MemberSignature Language="C#" Value="public static System.Windows.Resources.StreamResourceInfo GetRemoteStream (Uri uriRemote);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Windows.Resources.StreamResourceInfo GetRemoteStream(class System.Uri uriRemote) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.GetRemoteStream(System.Uri)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetRemoteStream (uriRemote As Uri) As StreamResourceInfo" />
<MemberSignature Language="F#" Value="static member GetRemoteStream : Uri -> System.Windows.Resources.StreamResourceInfo" Usage="System.Windows.Application.GetRemoteStream uriRemote" />
<MemberSignature Language="C++ CLI" Value="public:
 static System::Windows::Resources::StreamResourceInfo ^ GetRemoteStream(Uri ^ uriRemote);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Security.SecurityCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecurityCritical>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Windows.Resources.StreamResourceInfo</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="uriRemote" Type="System.Uri" />
</Parameters>
<Docs>
<param name="uriRemote">The <see cref="T:System.Uri" /> that maps to a loose resource at the site of origin.</param>
<summary>Returns a resource stream for a site-of-origin data file that is located at the specified <see cref="T:System.Uri" /> (see <see href="https://learn.microsoft.com/dotnet/framework/wpf/app-development/wpf-application-resource-content-and-data-files">WPF Application Resource, Content, and Data Files</see>).</summary>
<returns>A <see cref="T:System.Windows.Resources.StreamResourceInfo" /> that contains a resource stream for a site-of-origin data file that is located at the specified <see cref="T:System.Uri" />. If the loose resource is not found, <see langword="null" /> is returned.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is not thread safe.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" /> is null.</exception>
<exception cref="T:System.ArgumentException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" /> is either not relative, or is absolute but not in the <c>pack://siteoforigin:,,,/</c> form.</exception>
<altmember cref="M:System.Windows.Application.GetContentStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetResourceStream(System.Uri)" />
<altmember cref="Overload:System.Windows.Application.LoadComponent" />
</Docs>
</Member>
<Member MemberName="GetResourceStream">
<MemberSignature Language="C#" Value="public static System.Windows.Resources.StreamResourceInfo GetResourceStream (Uri uriResource);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig class System.Windows.Resources.StreamResourceInfo GetResourceStream(class System.Uri uriResource) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.GetResourceStream(System.Uri)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function GetResourceStream (uriResource As Uri) As StreamResourceInfo" />
<MemberSignature Language="F#" Value="static member GetResourceStream : Uri -> System.Windows.Resources.StreamResourceInfo" Usage="System.Windows.Application.GetResourceStream uriResource" />
<MemberSignature Language="C++ CLI" Value="public:
 static System::Windows::Resources::StreamResourceInfo ^ GetResourceStream(Uri ^ uriResource);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Security.SecurityCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecurityCritical>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Windows.Resources.StreamResourceInfo</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="uriResource" Type="System.Uri" />
</Parameters>
<Docs>
<param name="uriResource">The <see cref="T:System.Uri" /> that maps to an embedded resource.</param>
<summary>Returns a resource stream for a resource data file that is located at the specified <see cref="T:System.Uri" /> (see <see href="https://learn.microsoft.com/dotnet/framework/wpf/app-development/wpf-application-resource-content-and-data-files">WPF Application Resource, Content, and Data Files</see>).</summary>
<returns>A <see cref="T:System.Windows.Resources.StreamResourceInfo" /> that contains a resource stream for resource data file that is located at the specified <see cref="T:System.Uri" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is not thread safe.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetResourceStream(System.Uri)" /> is null.</exception>
<exception cref="T:System.ArgumentException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetResourceStream(System.Uri)" /> is either not relative, or is absolute but not in the <c>pack://application:,,,/</c> form.</exception>
<exception cref="T:System.IO.IOException">The <see cref="T:System.Uri" /> that is passed to <see cref="M:System.Windows.Application.GetResourceStream(System.Uri)" /> cannot be found.</exception>
<altmember cref="M:System.Windows.Application.GetContentStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" />
<altmember cref="Overload:System.Windows.Application.LoadComponent" />
</Docs>
</Member>
<Member MemberName="LoadCompleted">
<MemberSignature Language="C#" Value="public event System.Windows.Navigation.LoadCompletedEventHandler LoadCompleted;" />
<MemberSignature Language="ILAsm" Value=".event class System.Windows.Navigation.LoadCompletedEventHandler LoadCompleted" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.LoadCompleted" />
<MemberSignature Language="VB.NET" Value="Public Custom Event LoadCompleted As LoadCompletedEventHandler " FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<MemberSignature Language="F#" Value="member this.LoadCompleted : System.Windows.Navigation.LoadCompletedEventHandler " Usage="member this.LoadCompleted : System.Windows.Navigation.LoadCompletedEventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event System::Windows::Navigation::LoadCompletedEventHandler ^ LoadCompleted;" />
<MemberSignature Language="VB.NET" Value="Public Event LoadCompleted As LoadCompletedEventHandler " FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Windows.Navigation.LoadCompletedEventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs when content that was navigated to by a navigator in the application has been loaded, parsed, and has begun rendering.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A navigator is either a <xref:System.Windows.Navigation.NavigationWindow> or a <xref:System.Windows.Controls.Frame>.
See <xref:System.Windows.Navigation.NavigationService.LoadCompleted?displayProperty=nameWithType>.
> [!NOTE]
> Listen for events on the navigated content such as the <xref:System.Windows.FrameworkElement.Loaded> event on <xref:System.Windows.Controls.Page> before you access properties of the navigated content.
]]></format>
</remarks>
<altmember cref="E:System.Windows.Application.Navigated" />
<altmember cref="E:System.Windows.Application.Navigating" />
<altmember cref="E:System.Windows.Application.NavigationProgress" />
<altmember cref="E:System.Windows.Application.NavigationStopped" />
<altmember cref="E:System.Windows.Application.NavigationFailed" />
<altmember cref="E:System.Windows.Application.FragmentNavigation" />
</Docs>
</Member>
<MemberGroup MemberName="LoadComponent">
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Loads a XAML file that is located at the specified uniform resource identifier (URI).</summary>
<remarks>
<format type="text/markdown"><).
> [!NOTE]
> This method is not thread-safe.
]]></format>
</remarks>
<altmember cref="M:System.Windows.Application.GetResourceStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetContentStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" />
</Docs>
</MemberGroup>
<Member MemberName="LoadComponent">
<MemberSignature Language="C#" Value="public static object LoadComponent (Uri resourceLocator);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig object LoadComponent(class System.Uri resourceLocator) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.LoadComponent(System.Uri)" />
<MemberSignature Language="VB.NET" Value="Public Shared Function LoadComponent (resourceLocator As Uri) As Object" />
<MemberSignature Language="F#" Value="static member LoadComponent : Uri -> obj" Usage="System.Windows.Application.LoadComponent resourceLocator" />
<MemberSignature Language="C++ CLI" Value="public:
 static System::Object ^ LoadComponent(Uri ^ resourceLocator);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Object</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="resourceLocator" Type="System.Uri" />
</Parameters>
<Docs>
<param name="resourceLocator">A <see cref="T:System.Uri" /> that maps to a relative XAML file.</param>
<summary>Loads a XAML file that is located at the specified uniform resource identifier (URI), and converts it to an instance of the object that is specified by the root element of the XAML file.</summary>
<returns>An instance of the root element specified by the XAML file loaded.</returns>
<remarks>
<format type="text/markdown"><).
> [!NOTE]
> This method is not thread-safe.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="resourceLocator" /> is null.</exception>
<exception cref="T:System.ArgumentException">The <paramref name="resourceLocator" /> is an absolute URI.</exception>
<exception cref="T:System.Exception">The file is not a XAML file.</exception>
<altmember cref="M:System.Windows.Application.GetResourceStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetContentStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" />
</Docs>
</Member>
<Member MemberName="LoadComponent">
<MemberSignature Language="C#" Value="public static void LoadComponent (object component, Uri resourceLocator);" />
<MemberSignature Language="ILAsm" Value=".method public static hidebysig void LoadComponent(object component, class System.Uri resourceLocator) cil managed" />
<MemberSignature Language="DocId" Value="M:System.Windows.Application.LoadComponent(System.Object,System.Uri)" />
<MemberSignature Language="VB.NET" Value="Public Shared Sub LoadComponent (component As Object, resourceLocator As Uri)" />
<MemberSignature Language="F#" Value="static member LoadComponent : obj * Uri -> unit" Usage="System.Windows.Application.LoadComponent (component, resourceLocator)" />
<MemberSignature Language="C++ CLI" Value="public:
 static void LoadComponent(System::Object ^ component, Uri ^ resourceLocator);" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1">
<AttributeName Language="C#">[System.Security.SecurityCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecurityCritical>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="component" Type="System.Object" />
<Parameter Name="resourceLocator" Type="System.Uri" />
</Parameters>
<Docs>
<param name="component">An object of the same type as the root element of the XAML file.</param>
<param name="resourceLocator">A <see cref="T:System.Uri" /> that maps to a relative XAML file.</param>
<summary>Loads a XAML file that is located at the specified uniform resource identifier (URI) and converts it to an instance of the object that is specified by the root element of the XAML file.</summary>
<remarks>
<format type="text/markdown"><).
> [!NOTE]
> This method is not thread-safe.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="resourceLocator" /> is null.</exception>
<exception cref="T:System.ArgumentException">The <paramref name="resourceLocator" /> is an absolute URI.</exception>
<exception cref="T:System.Exception">
<paramref name="component" /> is of a type that does not match the root element of the XAML file.</exception>
<altmember cref="M:System.Windows.Application.GetResourceStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetContentStream(System.Uri)" />
<altmember cref="M:System.Windows.Application.GetRemoteStream(System.Uri)" />
</Docs>
</Member>
<Member MemberName="MainWindow">
<MemberSignature Language="C#" Value="public System.Windows.Window MainWindow { get; set; }" />
<MemberSignature Language="ILAsm" Value=".property instance class System.Windows.Window MainWindow" />
<MemberSignature Language="DocId" Value="P:System.Windows.Application.MainWindow" />
<MemberSignature Language="VB.NET" Value="Public Property MainWindow As Window" />
<MemberSignature Language="F#" Value="member this.MainWindow : System.Windows.Window with get, set" Usage="System.Windows.Application.MainWindow" />
<MemberSignature Language="C++ CLI" Value="public:
 property System::Windows::Window ^ MainWindow { System::Windows::Window ^ get(); void set(System::Windows::Window ^ value); };" />
<MemberType>Property</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Windows.Window</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets or sets the main window of the application.</summary>
<value>A <see cref="T:System.Windows.Window" /> that is designated as the main application window.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
<xref:System.Windows.Application.MainWindow%2A> is automatically set with a reference to the first <xref:System.Windows.Window> object to be instantiated in the <xref:System.AppDomain>.
You can specify a different main window by setting <xref:System.Windows.Application.MainWindow%2A> assigning another <xref:System.Windows.Application.Windows%2A> object to the <xref:System.Windows.Application.MainWindow%2A> property.
If the <xref:System.Windows.Application.ShutdownMode%2A> property of the <xref:System.Windows.Application> object is set to <xref:System.Windows.ShutdownMode.OnMainWindowClose>, closing the main window causes the application to shut down.
It is possible to set the <xref:System.Windows.Application.MainWindow%2A> property from XAML, if an application's main window is not the window that is produced by setting the <xref:System.Windows.Application.StartupUri%2A> property in XAML. The two limitations of the XAML approach are:
- You can specify either a XAML-only <xref:System.Windows.Window> or a XAML-only <xref:System.Windows.Navigation.NavigationWindow> as the main window.
- You must set the <xref:System.Windows.UIElement.Visibility%2A> property of the window you specify, otherwise it won't be shown.
The reference to the first <xref:System.Windows.Window> object to be instantiated is also added as the first item to the <xref:System.Windows.Application.Windows%2A> collection. If <xref:System.Windows.Application.MainWindow%2A> is subsequently set with a reference to a different <xref:System.Windows.Window>, the position of the item with the reference to the main window will change, while the order of items in <xref:System.Windows.Application.Windows%2A> remains the same. Consequently, always use <xref:System.Windows.Application.MainWindow%2A> to refer to the main window instead of the first item in <xref:System.Windows.Application.Windows%2A>.
> [!NOTE]
> If the main window is a <xref:System.Windows.Navigation.NavigationWindow>, and you need specific access to <xref:System.Windows.Navigation.NavigationWindow> members, you will need to cast the value of <xref:System.Windows.Application.MainWindow%2A> to <xref:System.Windows.Navigation.NavigationWindow>.
>
> This property is available only from the thread that created the <xref:System.Windows.Application> object.
## Examples
The following example shows how to find the main application window.
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/MainWindow/App.xaml.cs" id="Snippetgetapplicationmainwindowcode":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/ApplicationMainWindowSnippets/visualbasic/application.xaml.vb" id="Snippetgetapplicationmainwindowcode":::
The following example shows how to set <xref:System.Windows.Application.MainWindow%2A> using XAML.
:::code language="xaml" source="~/snippets/xaml/VS_Snippets_Wpf/ApplicationMainWindowSnippets/XAML/App.xaml" id="Snippetsetapplicationmainwindowxaml":::
The following example shows how to instantiate the <xref:System.Windows.Application.MainWindow%2A> in code during application startup.
:::code language="csharp" source="~/snippets/csharp/System.Windows/Application/MainWindow/App1.xaml.cs" id="Snippetfirstwindowusingcodecodebehind":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Wpf/HOWTOWindowManagementSnippets/visualbasic/application.xaml.vb" id="Snippetfirstwindowusingcodecodebehind":::
]]></format>
</remarks>
<exception cref="T:System.InvalidOperationException">
<see cref="P:System.Windows.Application.MainWindow" /> is set from an application that's hosted in a browser, such as an XAML browser applications (XBAPs).</exception>
<altmember cref="E:System.Windows.Application.Exit" />
</Docs>
</Member>
<Member MemberName="Navigated">
<MemberSignature Language="C#" Value="public event System.Windows.Navigation.NavigatedEventHandler Navigated;" />
<MemberSignature Language="ILAsm" Value=".event class System.Windows.Navigation.NavigatedEventHandler Navigated" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.Navigated" />
<MemberSignature Language="VB.NET" Value="Public Custom Event Navigated As NavigatedEventHandler " FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<MemberSignature Language="F#" Value="member this.Navigated : System.Windows.Navigation.NavigatedEventHandler " Usage="member this.Navigated : System.Windows.Navigation.NavigatedEventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event System::Windows::Navigation::NavigatedEventHandler ^ Navigated;" />
<MemberSignature Language="VB.NET" Value="Public Event Navigated As NavigatedEventHandler " FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Event</MemberType>
<AssemblyInfo>
<AssemblyName>PresentationFramework</AssemblyName>
<AssemblyVersion>3.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Windows.Navigation.NavigatedEventHandler</ReturnType>
</ReturnValue>
<Docs>
<summary>Occurs when the content that is being navigated to by a navigator in the application has been found, although it may not have completed loading.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
A navigator is either a <xref:System.Windows.Navigation.NavigationWindow> or a <xref:System.Windows.Controls.Frame>.
See <xref:System.Windows.Navigation.NavigationService.NavigationFailed?displayProperty=nameWithType>.
]]></format>
</remarks>
<altmember cref="E:System.Windows.Application.Navigating" />
<altmember cref="E:System.Windows.Application.LoadCompleted" />
<altmember cref="E:System.Windows.Application.NavigationProgress" />
<altmember cref="E:System.Windows.Application.NavigationStopped" />
<altmember cref="E:System.Windows.Application.NavigationFailed" />
<altmember cref="E:System.Windows.Application.FragmentNavigation" />
</Docs>
</Member>
<Member MemberName="Navigating">
<MemberSignature Language="C#" Value="public event System.Windows.Navigation.NavigatingCancelEventHandler Navigating;" />
<MemberSignature Language="ILAsm" Value=".event class System.Windows.Navigation.NavigatingCancelEventHandler Navigating" />
<MemberSignature Language="DocId" Value="E:System.Windows.Application.Navigating" />
<MemberSignature Language="VB.NET" Value="Public Custom Event Navigating As NavigatingCancelEventHandler " FrameworkAlternate="netframework-3.0;netframework-3.5;netframework-4.0;netframework-4.5;netframework-4.5.1;netframework-4.5.2;windowsdesktop-3.0;windowsdesktop-3.1;windowsdesktop-5.0;windowsdesktop-6.0;windowsdesktop-7.0;windowsdesktop-8.0;windowsdesktop-9.0" />
<MemberSignature Language="F#" Value="member this.Navigating : System.Windows.Navigation.NavigatingCancelEventHandler " Usage="member this.Navigating : System.Windows.Navigation.NavigatingCancelEventHandler " />
<MemberSignature Language="C++ CLI" Value="public:
 event System::Windows::Navigation::NavigatingCancelEventHandler ^ Navigating;" />
<MemberSignature Language="VB.NET" Value="Public Event Navigating As NavigatingCancelEventHandler " FrameworkAlternate="netframework-4.6;netframework-4.6.1;netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
<MemberType>Event</MemberType>