/
AttributeCollection.xml
1280 lines (1206 loc) · 83.8 KB
/
AttributeCollection.xml
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<Type Name="AttributeCollection" FullName="System.ComponentModel.AttributeCollection">
<TypeSignature Language="C#" Value="public class AttributeCollection : System.Collections.ICollection" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit AttributeCollection extends System.Object implements class System.Collections.ICollection, class System.Collections.IEnumerable" />
<TypeSignature Language="DocId" Value="T:System.ComponentModel.AttributeCollection" />
<TypeSignature Language="VB.NET" Value="Public Class AttributeCollection
Implements ICollection" />
<TypeSignature Language="F#" Value="type AttributeCollection = class
 interface ICollection
 interface IEnumerable" />
<TypeSignature Language="C++ CLI" Value="public ref class AttributeCollection : System::Collections::ICollection" />
<AssemblyInfo>
<AssemblyName>System.ComponentModel.TypeConverter</AssemblyName>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</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>
<AssemblyInfo>
<AssemblyName>System</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<TypeForwardingChain>
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.ComponentModel.TypeConverter" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.ComponentModel.TypeConverter" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.ComponentModel.TypeConverter" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.ComponentModel.TypeConverter" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.ComponentModel.TypeConverter" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.ComponentModel.TypeConverter" FromVersion="4.1.1.0" To="System" ToVersion="4.0.0.0" FrameworkAlternate="netframework-4.6.2;netframework-4.7;netframework-4.7.1;netframework-4.7.2;netframework-4.8;netframework-4.8.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.Object</BaseTypeName>
</Base>
<Interfaces>
<Interface>
<InterfaceName>System.Collections.ICollection</InterfaceName>
</Interface>
<Interface>
<InterfaceName>System.Collections.IEnumerable</InterfaceName>
</Interface>
</Interfaces>
<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(0)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(0)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(1)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(1)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="netframework-1.1;netframework-2.0;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.Runtime.InteropServices.ComVisible(true)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(true)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Represents a collection of attributes.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The <xref:System.ComponentModel.AttributeCollection> class is read-only; it does not implement methods to add or remove attributes. You must inherit from this class to implement these methods.
Use the <xref:System.ComponentModel.AttributeCollection.Count%2A> property to find the number of attributes that exist in the collection.
You can also use the methods of this class to query the collection about its contents. Call the <xref:System.ComponentModel.AttributeCollection.Contains%2A> method to verify that a specified attribute or attribute array exists in the collection. Call the <xref:System.ComponentModel.AttributeCollection.Matches%2A> method to verify that a specified attribute or array of attributes exists in the collection, and that the values of the specified attributes are the same as the values in the collection.
While most attributes have default values, default values are not required. If an attribute has no default value, `null` is returned from the indexed property that takes a type. When defining your own attributes, you can declare a default value by either providing a constructor that takes no arguments, or defining a public static field of your attribute type named "Default".
## Examples
The first code example checks to see whether the <xref:System.ComponentModel.BrowsableAttribute> has been set in this collection. The second code example gets the actual value of the <xref:System.ComponentModel.DescriptionAttribute> for a button. Both examples require that `button1` and `textBox1` have been created on a form. When using attributes, verify that an attribute has been set, or access its value.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Overview/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection Example/VB/source.vb" id="Snippet1":::
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection Example/CPP/source.cpp" id="Snippet2":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Overview/source.cs" id="Snippet2":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection Example/VB/source.vb" id="Snippet2":::
]]></format>
</remarks>
<altmember cref="T:System.Attribute" />
<altmember cref="T:System.ComponentModel.BrowsableAttribute" />
<altmember cref="T:System.ComponentModel.DescriptionAttribute" />
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>System.ComponentModel.TypeConverter</AssemblyName>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.ComponentModel.AttributeCollection" /> class.</summary>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected AttributeCollection ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.ComponentModel.AttributeCollection.#ctor" />
<MemberSignature Language="VB.NET" Value="Protected Sub New ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 AttributeCollection();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.ComponentModel.TypeConverter</AssemblyName>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</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>
<AssemblyInfo>
<AssemblyName>System</AssemblyName>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<Attribute FrameworkAlternate="netframework-4.0">
<AttributeName Language="C#">[System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.TargetedPatchingOptOut("Performance critical to inline this type of method across NGen image boundaries")>]</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.ComponentModel.AttributeCollection" /> class.</summary>
<remarks>To be added.</remarks>
<altmember cref="T:System.Attribute" />
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public AttributeCollection (params Attribute[] attributes);" FrameworkAlternate="net-5.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;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;netstandard-2.0;netstandard-2.1" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.Attribute[] attributes) cil managed" />
<MemberSignature Language="DocId" Value="M:System.ComponentModel.AttributeCollection.#ctor(System.Attribute[])" />
<MemberSignature Language="VB.NET" Value="Public Sub New (ParamArray attributes As Attribute())" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;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;netstandard-2.0;netstandard-2.1" />
<MemberSignature Language="F#" Value="new System.ComponentModel.AttributeCollection : Attribute[] -> System.ComponentModel.AttributeCollection" Usage="new System.ComponentModel.AttributeCollection attributes" />
<MemberSignature Language="C++ CLI" Value="public:
 AttributeCollection(... cli::array <Attribute ^> ^ attributes);" FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;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;netstandard-2.0;netstandard-2.1" />
<MemberSignature Language="C#" Value="public AttributeCollection (params Attribute[]? attributes);" FrameworkAlternate="net-6.0;net-7.0;net-8.0;net-9.0" />
<MemberSignature Language="C#" Value="public AttributeCollection (Attribute[] attributes);" FrameworkAlternate="netframework-1.1" />
<MemberSignature Language="VB.NET" Value="Public Sub New (attributes As Attribute())" FrameworkAlternate="netframework-1.1" />
<MemberSignature Language="C++ CLI" Value="public:
 AttributeCollection(cli::array <Attribute ^> ^ attributes);" FrameworkAlternate="netframework-1.1" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.ComponentModel.TypeConverter</AssemblyName>
<AssemblyVersion>4.1.0.0</AssemblyVersion>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</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>
<AssemblyInfo>
<AssemblyName>System</AssemblyName>
<AssemblyVersion>1.0.5000.0</AssemblyVersion>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.0.5.0</AssemblyVersion>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>netstandard</AssemblyName>
<AssemblyVersion>2.0.0.0</AssemblyVersion>
<AssemblyVersion>2.1.0.0</AssemblyVersion>
</AssemblyInfo>
<Parameters>
<Parameter Name="attributes" Type="System.Attribute[]">
<Attributes>
<Attribute FrameworkAlternate="net-5.0;net-6.0;net-7.0;net-8.0;net-9.0;netcore-1.0;netcore-1.1;netcore-2.0;netcore-2.1;netcore-2.2;netcore-3.0;netcore-3.1;netframework-2.0;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;netstandard-2.0;netstandard-2.1">
<AttributeName Language="C#">[System.ParamArray]</AttributeName>
<AttributeName Language="F#">[<System.ParamArray>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(new System.Byte[] { 2, 1 })]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.Nullable(new System.Byte[] { 2, 1 })>]</AttributeName>
</Attribute>
</Attributes>
</Parameter>
</Parameters>
<Docs>
<param name="attributes">An array of type <see cref="T:System.Attribute" /> that provides the attributes for this collection.</param>
<summary>Initializes a new instance of the <see cref="T:System.ComponentModel.AttributeCollection" /> class.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Examples
The following code example creates a new <xref:System.ComponentModel.AttributeCollection> using the attributes on `button1`. It assumes that `button1` has been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.AttributeCollection Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/.ctor/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.AttributeCollection Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="attributes" /> is <see langword="null" />.</exception>
<altmember cref="T:System.Attribute" />
</Docs>
</Member>
<Member MemberName="Attributes">
<MemberSignature Language="C#" Value="protected virtual Attribute[] Attributes { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance class System.Attribute[] Attributes" />
<MemberSignature Language="DocId" Value="P:System.ComponentModel.AttributeCollection.Attributes" />
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<value>The attribute collection.</value>
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<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(2)>]</AttributeName>
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<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
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<Parameters>
<Parameter Name="attribute" Type="System.Attribute" />
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<Docs>
<param name="attribute">An <see cref="T:System.Attribute" /> to find in the collection.</param>
<summary>Determines whether this collection of attributes has the specified attribute.</summary>
<returns>
<see langword="true" /> if the collection contains the attribute or is the default attribute for the type of attribute; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This collection has the specified attribute if the specified type of attribute exists in the collection, and if the value of the specified attribute is the same as the value of the instance of the attribute in the collection.
The difference between the <xref:System.ComponentModel.AttributeCollection.Matches%2A> and <xref:System.ComponentModel.AttributeCollection.Contains%2A> methods is that <xref:System.ComponentModel.AttributeCollection.Matches%2A> calls the <xref:System.Attribute.Match%2A> method on an attribute, and <xref:System.ComponentModel.AttributeCollection.Contains%2A> calls the <xref:System.Object.Equals%2A> method.
For most attributes, these methods do the same thing. For attributes that may have multiple flags, however, <xref:System.Attribute.Match%2A> is typically implemented so that it returns `true` if any of the flags are satisfied. For example, consider a data binding attribute with the Boolean flags "SupportsSql", "SupportsOleDb", and "SupportsXml". This attribute may be present on a property that supports all three data-binding approaches. It will often be the case that a programmer needs to know only if a particular approach is available, not all three. Therefore, a programmer could use <xref:System.Attribute.Match%2A> with an instance of the attribute containing only the flags the programmer needs.
## Examples
The following code example checks to see whether the collection has a <xref:System.ComponentModel.BrowsableAttribute> set to `true`. It assumes that `button1` and `textBox1` have been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.Contains Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Contains/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.Contains Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
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<Parameter Name="attributes" Type="System.Attribute[]">
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<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(new System.Byte[] { 2, 1 })]</AttributeName>
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<param name="attributes">An array of type <see cref="T:System.Attribute" /> to find in the collection.</param>
<summary>Determines whether this attribute collection contains all the specified attributes in the attribute array.</summary>
<returns>
<see langword="true" /> if the collection contains all the attributes; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This collection has the specified array of attributes if all the specified attribute types exist in the collection and if each attribute in the specified array is the same as an attribute in the collection.
## Examples
The following code example compares the attributes in `button1` and `textBox1` to see whether the attributes for the button are contained in the attributes for the text box. It assumes that both `button1` and `textBox1` have been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.Contains1 Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Contains/source1.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.Contains1 Example/VB/source.vb" id="Snippet1":::
]]></format>
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<param name="array">The <see cref="T:System.Array" /> to copy the collection to.</param>
<param name="index">The index to start from.</param>
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<remarks>To be added.</remarks>
<altmember cref="T:System.Attribute" />
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## Remarks
You can use the <xref:System.ComponentModel.AttributeCollection.Count%2A> property to set the limits of a loop that iterates through a collection of objects. If the collection is zero-based, be sure to use `Count - 1` as the upper boundary of the loop.
## Examples
The following code example uses the <xref:System.ComponentModel.AttributeCollection.Count%2A> property to print the number of properties on `button1` in a text box. It assumes that `button1` and `textBox1` have been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.Count Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Count/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.Count Example/VB/source.vb" id="Snippet1":::
]]></format>
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<remarks>To be added.</remarks>
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<AttributeName Language="F#">[<System.ParamArray>]</AttributeName>
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<AttributeName Language="C#">[System.Runtime.CompilerServices.Nullable(new System.Byte[] { 2, 1 })]</AttributeName>
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<param name="existing">An <see cref="T:System.ComponentModel.AttributeCollection" /> from which to create the copy.</param>
<param name="newAttributes">An array of type <see cref="T:System.Attribute" /> that provides the attributes for this collection. Can be <see langword="null" />.</param>
<summary>Creates a new <see cref="T:System.ComponentModel.AttributeCollection" /> from an existing <see cref="T:System.ComponentModel.AttributeCollection" />.</summary>
<returns>A new <see cref="T:System.ComponentModel.AttributeCollection" /> that is a copy of <paramref name="existing" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If the `newAttributes` parameter is provided, its <xref:System.Attribute> entries are merged with those of the `existing` parameter.
]]></format>
</remarks>
<exception cref="T:System.ArgumentNullException">
<paramref name="existing" /> is <see langword="null" />.</exception>
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<Parameter Name="attributeType" Type="System.Type">
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<Attribute FrameworkAlternate="net-6.0;net-7.0;net-8.0;net-9.0">
<AttributeName Language="C#">[System.Diagnostics.CodeAnalysis.DynamicallyAccessedMembers(System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicFields | System.Diagnostics.CodeAnalysis.DynamicallyAccessedMemberTypes.PublicParameterlessConstructor)]</AttributeName>
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<param name="attributeType">The <see cref="T:System.Type" /> of the attribute to retrieve.</param>
<summary>Returns the default <see cref="T:System.Attribute" /> of a given <see cref="T:System.Type" />.</summary>
<returns>The default <see cref="T:System.Attribute" /> of a given <paramref name="attributeType" />.</returns>
<remarks>To be added.</remarks>
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<InterfaceMember FrameworkAlternate="netcore-1.0;netcore-1.1">M:System.Collections.IEnumerable.GetEnumerator</InterfaceMember>
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<ReturnType>System.Collections.IEnumerator</ReturnType>
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<summary>Gets an enumerator for this collection.</summary>
<returns>An enumerator of type <see cref="T:System.Collections.IEnumerator" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Examples
The following code example gets an enumerator for the attributes on `button1`. It uses the enumerator to print the names of the attributes in the collection. It assumes that `button1` and `textBox1` have been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.GetEnumerator Example/CPP/Source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/GetEnumerator/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.GetEnumerator Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="T:System.Attribute" />
<altmember cref="T:System.Collections.IEnumerator" />
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<MemberGroup MemberName="Item">
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<AssemblyName>System.ComponentModel.TypeConverter</AssemblyName>
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<Docs>
<summary>Gets the attribute with the specified index.</summary>
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<Member MemberName="Item">
<MemberSignature Language="C#" Value="public virtual Attribute this[int index] { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance class System.Attribute Item(int32)" />
<MemberSignature Language="DocId" Value="P:System.ComponentModel.AttributeCollection.Item(System.Int32)" />
<MemberSignature Language="VB.NET" Value="Default Public Overridable ReadOnly Property Item(index As Integer) As Attribute" />
<MemberSignature Language="F#" Value="member this.Item(int) : Attribute" Usage="System.ComponentModel.AttributeCollection.Item" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Property</MemberType>
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<ReturnValue>
<ReturnType>System.Attribute</ReturnType>
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<Parameters>
<Parameter Name="index" Type="System.Int32" />
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<Docs>
<param name="index">The zero-based index of <see cref="T:System.ComponentModel.AttributeCollection" />.</param>
<summary>Gets the attribute with the specified index number.</summary>
<value>The <see cref="T:System.Attribute" /> with the specified index number.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The index number is zero-based. Therefore, you must subtract 1 from the numerical position of a particular <xref:System.Attribute> to access that <xref:System.Attribute>. For example, to get the third <xref:System.Attribute>, you need to specify `myColl[2]`.
## Examples
The following code example uses the <xref:System.ComponentModel.AttributeCollection.Item%2A> property to print the name of the <xref:System.Attribute> specified by the index number in a text box. Because the index number is zero-based, this code example prints the name of the second <xref:System.Attribute> in a text box. It assumes `button1` and `textBox1` have been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.this Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Item/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.this Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="T:System.Attribute" />
</Docs>
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<Docs>
<param name="attributeType">The <see cref="T:System.Type" /> of the <see cref="T:System.Attribute" /> to get from the collection.</param>
<summary>Gets the attribute with the specified type.</summary>
<value>The <see cref="T:System.Attribute" /> with the specified type or, if the attribute does not exist, the default value for the attribute type.</value>
<remarks>
<format type="text/markdown"><.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.this1 Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Item/source1.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.this1 Example/VB/source.vb" id="Snippet1":::
]]></format>
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<summary>Determines whether a specified attribute or array of attributes is the same as an attribute or array of attributes in the collection.</summary>
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<Attributes>
<Attribute FrameworkAlternate="net-8.0;net-9.0">
<AttributeName Language="C#">[System.Runtime.CompilerServices.NullableContext(2)]</AttributeName>
<AttributeName Language="F#">[<System.Runtime.CompilerServices.NullableContext(2)>]</AttributeName>
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<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="attribute" Type="System.Attribute" />
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<Docs>
<param name="attribute">An instance of <see cref="T:System.Attribute" /> to compare with the attributes in this collection.</param>
<summary>Determines whether a specified attribute is the same as an attribute in the collection.</summary>
<returns>
<see langword="true" /> if the attribute is contained within the collection and has the same value as the attribute in the collection; otherwise, <see langword="false" />.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
An attribute can provide support for matching.
The difference between the <xref:System.ComponentModel.AttributeCollection.Matches%2A> and <xref:System.ComponentModel.AttributeCollection.Contains%2A> methods is that <xref:System.ComponentModel.AttributeCollection.Matches%2A> calls the <xref:System.Attribute.Match%2A> method on an attribute, and <xref:System.ComponentModel.AttributeCollection.Contains%2A> calls the <xref:System.Object.Equals%2A> method.
For most attributes, these methods do the same thing. For attributes that may have multiple flags, however, <xref:System.Attribute.Match%2A> is typically implemented so that it returns `true` if any of the flags are satisfied. For example, consider a data binding attribute with the Boolean flags "SupportsSql", "SupportsOleDb", and "SupportsXml". This attribute may be present on a property that supports all three data binding approaches. It will often be the case that a programmer needs to know only if a particular approach is available, not all three. Therefore, a programmer could use <xref:System.Attribute.Match%2A> with an instance of the attribute containing only the flags the programmer needs.
## Examples
The following code example verifies that the <xref:System.ComponentModel.BrowsableAttribute> is a member of the collection and that it has been set to `true`. It assumes that `button1` and `textBox1` have been created on a form.
:::code language="cpp" source="~/snippets/cpp/VS_Snippets_Winforms/Classic AttributeCollection.Matches Example/CPP/source.cpp" id="Snippet1":::
:::code language="csharp" source="~/snippets/csharp/System.ComponentModel/AttributeCollection/Matches/source.cs" id="Snippet1":::
:::code language="vb" source="~/snippets/visualbasic/VS_Snippets_Winforms/Classic AttributeCollection.Matches Example/VB/source.vb" id="Snippet1":::
]]></format>
</remarks>
<altmember cref="T:System.Attribute" />
<altmember cref="T:System.ComponentModel.BrowsableAttribute" />
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