/
UnmanagedMemoryStream.xml
2089 lines (1965 loc) · 137 KB
/
UnmanagedMemoryStream.xml
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<Type Name="UnmanagedMemoryStream" FullName="System.IO.UnmanagedMemoryStream">
<TypeSignature Language="C#" Value="public class UnmanagedMemoryStream : System.IO.Stream" />
<TypeSignature Language="ILAsm" Value=".class public auto ansi beforefieldinit UnmanagedMemoryStream extends System.IO.Stream" />
<TypeSignature Language="DocId" Value="T:System.IO.UnmanagedMemoryStream" />
<TypeSignature Language="VB.NET" Value="Public Class UnmanagedMemoryStream
Inherits Stream" />
<TypeSignature Language="F#" Value="type UnmanagedMemoryStream = class
 inherit Stream" />
<TypeSignature Language="C++ CLI" Value="public ref class UnmanagedMemoryStream : System::IO::Stream" />
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<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>
<AssemblyInfo>
<AssemblyName>System.Runtime.InteropServices</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<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>
<TypeForwardingChain>
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="5.0.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="System.Runtime.InteropServices" FromVersion="5.0.0.0" To="System.Runtime" ToVersion="5.0.0.0" FrameworkAlternate="net-5.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="6.0.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="System.Runtime.InteropServices" FromVersion="6.0.0.0" To="System.Runtime" ToVersion="6.0.0.0" FrameworkAlternate="net-6.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="7.0.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="System.Runtime.InteropServices" FromVersion="7.0.0.0" To="System.Runtime" ToVersion="7.0.0.0" FrameworkAlternate="net-7.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="8.0.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="System.Runtime.InteropServices" FromVersion="8.0.0.0" To="System.Runtime" ToVersion="8.0.0.0" FrameworkAlternate="net-8.0" />
<TypeForwarding From="netstandard" FromVersion="2.1.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="9.0.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.Runtime.InteropServices" FromVersion="9.0.0.0" To="System.Runtime" ToVersion="9.0.0.0" FrameworkAlternate="net-9.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="4.1.0.0" To="System.Runtime.InteropServices" ToVersion="4.2.0.0" FrameworkAlternate="netcore-2.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="4.1.1.0" To="System.Runtime.InteropServices" ToVersion="4.2.1.0" FrameworkAlternate="netcore-2.1;netcore-2.2;netcore-3.0" />
<TypeForwarding From="System.IO.UnmanagedMemoryStream" FromVersion="4.1.2.0" To="System.Runtime.InteropServices" ToVersion="4.2.2.0" FrameworkAlternate="netcore-3.1" />
</TypeForwardingChain>
<Base>
<BaseTypeName>System.IO.Stream</BaseTypeName>
</Base>
<Interfaces />
<Attributes>
<Attribute FrameworkAlternate="netframework-2.0;netframework-3.0;netframework-3.5">
<AttributeName Language="C#">[System.CLSCompliant(false)]</AttributeName>
<AttributeName Language="F#">[<System.CLSCompliant(false)>]</AttributeName>
</Attribute>
</Attributes>
<Docs>
<summary>Provides access to unmanaged blocks of memory from managed code.</summary>
<remarks>
<format type="text/markdown"><]
## Examples
The following code example demonstrates how to read from and write to unmanaged memory using the <xref:System.IO.UnmanagedMemoryStream> class. A block of unmanaged memory is allocated and de-allocated using the <xref:System.Runtime.InteropServices.Marshal> class.
:::code language="csharp" source="~/snippets/csharp/System.IO/UnmanagedMemoryStream/Overview/sample.cs" id="Snippet1":::
]]></format>
</remarks>
</Docs>
<Members>
<MemberGroup MemberName=".ctor">
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class.</summary>
</Docs>
</MemberGroup>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="protected UnmanagedMemoryStream ();" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig specialname rtspecialname instance void .ctor() cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.#ctor" />
<MemberSignature Language="VB.NET" Value="Protected Sub New ()" />
<MemberSignature Language="C++ CLI" Value="protected:
 UnmanagedMemoryStream();" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<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>
<AssemblyInfo>
<AssemblyName>System.Runtime.InteropServices</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<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;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.SecuritySafeCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecuritySafeCritical>]</AttributeName>
</Attribute>
</Attributes>
<Parameters />
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class.</summary>
<remarks>To be added.</remarks>
<exception cref="T:System.Security.SecurityException">The user does not have the required permission.</exception>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public UnmanagedMemoryStream (byte* pointer, long length);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(unsigned int8* pointer, int64 length) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.#ctor(System.Byte*,System.Int64)" />
<MemberSignature Language="F#" Value="new System.IO.UnmanagedMemoryStream : nativeptr<byte> * int64 -> System.IO.UnmanagedMemoryStream" Usage="new System.IO.UnmanagedMemoryStream (pointer, length)" />
<MemberSignature Language="C++ CLI" Value="public:
 UnmanagedMemoryStream(System::Byte* pointer, long length);" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</AssemblyName>
<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>
<AssemblyInfo>
<AssemblyName>System.Runtime.InteropServices</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<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="dotnet-uwp-10.0;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-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.CLSCompliant(false)]</AttributeName>
<AttributeName Language="F#">[<System.CLSCompliant(false)>]</AttributeName>
</Attribute>
<Attribute FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;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>
<Parameter Name="pointer" Type="System.Byte*" />
<Parameter Name="length" Type="System.Int64" />
</Parameters>
<Docs>
<param name="pointer">A pointer to an unmanaged memory location.</param>
<param name="length">The length of the memory to use.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class using the specified location and memory length.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This constructor creates a new instance of the <xref:System.IO.UnmanagedMemoryStream> class, and by default sets the <xref:System.IO.UnmanagedMemoryStream.CanWrite%2A> property to `false` and the <xref:System.IO.UnmanagedMemoryStream.CanRead%2A> property to `true`. The <xref:System.IO.UnmanagedMemoryStream.Length%2A> property is set to the value of the `length` parameter and cannot be changed.
## Examples
The following code example demonstrates how to read from and write to unmanaged memory using the <xref:System.IO.UnmanagedMemoryStream> class. A block of unmanaged memory is allocated and de-allocated using the <xref:System.Runtime.InteropServices.Marshal> class.
:::code language="csharp" source="~/snippets/csharp/System.IO/UnmanagedMemoryStream/.ctor/program.cs" id="Snippet00":::
]]></format>
</remarks>
<exception cref="T:System.Security.SecurityException">The user does not have the required permission.</exception>
<exception cref="T:System.ArgumentNullException">The <paramref name="pointer" /> value is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="length" /> value is less than zero.
-or-
The <paramref name="length" /> is large enough to cause an overflow.</exception>
</Docs>
</Member>
<Member MemberName=".ctor">
<MemberSignature Language="C#" Value="public UnmanagedMemoryStream (System.Runtime.InteropServices.SafeBuffer buffer, long offset, long length);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.Runtime.InteropServices.SafeBuffer buffer, int64 offset, int64 length) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.#ctor(System.Runtime.InteropServices.SafeBuffer,System.Int64,System.Int64)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (buffer As SafeBuffer, offset As Long, length As Long)" />
<MemberSignature Language="F#" Value="new System.IO.UnmanagedMemoryStream : System.Runtime.InteropServices.SafeBuffer * int64 * int64 -> System.IO.UnmanagedMemoryStream" Usage="new System.IO.UnmanagedMemoryStream (buffer, offset, length)" />
<MemberSignature Language="C++ CLI" Value="public:
 UnmanagedMemoryStream(System::Runtime::InteropServices::SafeBuffer ^ buffer, long offset, long length);" />
<MemberType>Constructor</MemberType>
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>mscorlib</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>
<AssemblyInfo>
<AssemblyName>System.Runtime.InteropServices</AssemblyName>
<AssemblyVersion>4.2.0.0</AssemblyVersion>
<AssemblyVersion>4.2.1.0</AssemblyVersion>
<AssemblyVersion>4.2.2.0</AssemblyVersion>
</AssemblyInfo>
<AssemblyInfo>
<AssemblyName>System.Runtime</AssemblyName>
<AssemblyVersion>5.0.0.0</AssemblyVersion>
<AssemblyVersion>6.0.0.0</AssemblyVersion>
<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
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<param name="buffer">The buffer to contain the unmanaged memory stream.</param>
<param name="offset">The byte position in the buffer at which to start the unmanaged memory stream.</param>
<param name="length">The length of the unmanaged memory stream.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class in a safe buffer with a specified offset and length.</summary>
<remarks>To be added.</remarks>
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<Parameter Name="pointer" Type="System.Byte*" />
<Parameter Name="length" Type="System.Int64" />
<Parameter Name="capacity" Type="System.Int64" />
<Parameter Name="access" Type="System.IO.FileAccess" />
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<Docs>
<param name="pointer">A pointer to an unmanaged memory location.</param>
<param name="length">The length of the memory to use.</param>
<param name="capacity">The total amount of memory assigned to the stream.</param>
<param name="access">One of the <see cref="T:System.IO.FileAccess" /> values.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class using the specified location, memory length, total amount of memory, and file access values.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
The `length` parameter defines the current amount of memory in use. If reading or appending data to the stream, the `length` value should be equal to the amount of valid data in the stream to be read from or preserved. If writing to the stream, this value should be zero.
The `capacity` parameter indicates the amount of total memory available. This value can describe a region that is longer than the length specified, or indicate a region that can be appended to. Any attempt to write beyond this value will fail.
The `access` parameter sets the <xref:System.IO.UnmanagedMemoryStream.CanRead%2A>, and <xref:System.IO.UnmanagedMemoryStream.CanWrite%2A> properties. Note that specifying <xref:System.IO.FileAccess.Write> does not guarantee that the stream will be writable. The access parameters allow the implementer to create an object whose implementation can match the actual stream that is exposed.
## Examples
The following code example demonstrates how to read from and write to unmanaged memory using the <xref:System.IO.UnmanagedMemoryStream> class. A block of unmanaged memory is allocated and de-allocated using the <xref:System.Runtime.InteropServices.Marshal> class.
:::code language="csharp" source="~/snippets/csharp/System.IO/UnmanagedMemoryStream/Overview/sample.cs" id="Snippet1":::
]]></format>
</remarks>
<exception cref="T:System.Security.SecurityException">The user does not have the required permission.</exception>
<exception cref="T:System.ArgumentNullException">The <paramref name="pointer" /> value is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="length" /> value is less than zero.
-or-
The <paramref name="capacity" /> value is less than zero.
-or-
The <paramref name="length" /> value is greater than the <paramref name="capacity" /> value.</exception>
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<MemberSignature Language="C#" Value="public UnmanagedMemoryStream (System.Runtime.InteropServices.SafeBuffer buffer, long offset, long length, System.IO.FileAccess access);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig specialname rtspecialname instance void .ctor(class System.Runtime.InteropServices.SafeBuffer buffer, int64 offset, int64 length, valuetype System.IO.FileAccess access) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.#ctor(System.Runtime.InteropServices.SafeBuffer,System.Int64,System.Int64,System.IO.FileAccess)" />
<MemberSignature Language="VB.NET" Value="Public Sub New (buffer As SafeBuffer, offset As Long, length As Long, access As FileAccess)" />
<MemberSignature Language="F#" Value="new System.IO.UnmanagedMemoryStream : System.Runtime.InteropServices.SafeBuffer * int64 * int64 * System.IO.FileAccess -> System.IO.UnmanagedMemoryStream" Usage="new System.IO.UnmanagedMemoryStream (buffer, offset, length, access)" />
<MemberSignature Language="C++ CLI" Value="public:
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<AttributeName Language="C#">[System.Security.SecuritySafeCritical]</AttributeName>
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<Parameter Name="offset" Type="System.Int64" Index="1" FrameworkAlternate="dotnet-uwp-10.0;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-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" />
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<param name="buffer">The buffer to contain the unmanaged memory stream.</param>
<param name="offset">The byte position in the buffer at which to start the unmanaged memory stream.</param>
<param name="length">The length of the unmanaged memory stream.</param>
<param name="access">The mode of file access to the unmanaged memory stream.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class in a safe buffer with a specified offset, length, and file access.</summary>
<remarks>To be added.</remarks>
</Docs>
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<Member MemberName="CanRead">
<MemberSignature Language="C#" Value="public override bool CanRead { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool CanRead" />
<MemberSignature Language="DocId" Value="P:System.IO.UnmanagedMemoryStream.CanRead" />
<MemberSignature Language="VB.NET" Value="Public Overrides ReadOnly Property CanRead As Boolean" />
<MemberSignature Language="F#" Value="member this.CanRead : bool" Usage="System.IO.UnmanagedMemoryStream.CanRead" />
<MemberSignature Language="C++ CLI" Value="public:
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<MemberType>Property</MemberType>
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<ReturnType>System.Boolean</ReturnType>
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<Docs>
<summary>Gets a value indicating whether a stream supports reading.</summary>
<value>
<see langword="false" /> if the object was created by a constructor with an <paramref name="access" /> parameter that did not include reading the stream and if the stream is closed; otherwise, <see langword="true" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This property indicates whether the current stream object supports reading.
## Examples
The following code example demonstrates how to read from and write to unmanaged memory using the <xref:System.IO.UnmanagedMemoryStream> class. A block of unmanaged memory is allocated and de-allocated using the <xref:System.Runtime.InteropServices.Marshal> class. In this example, an <xref:System.IO.UnmanagedMemoryStream> object is passed to a method which checks the <xref:System.IO.UnmanagedMemoryStream.CanRead%2A> property before attempting to display the contents to the console.
:::code language="csharp" source="~/snippets/csharp/System.IO/UnmanagedMemoryStream/.ctor/program.cs" id="Snippet00":::
]]></format>
</remarks>
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<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
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<Docs>
<summary>Gets a value indicating whether a stream supports seeking.</summary>
<value>
<see langword="false" /> if the stream is closed; otherwise, <see langword="true" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This property indicates whether the current stream object supports seeking.
]]></format>
</remarks>
</Docs>
</Member>
<Member MemberName="CanWrite">
<MemberSignature Language="C#" Value="public override bool CanWrite { get; }" />
<MemberSignature Language="ILAsm" Value=".property instance bool CanWrite" />
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<AttributeName Language="F#">[<get: System.Runtime.TargetedPatchingOptOut("Performance critical to inline across NGen image boundaries")>]</AttributeName>
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<ReturnValue>
<ReturnType>System.Boolean</ReturnType>
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<Docs>
<summary>Gets a value indicating whether a stream supports writing.</summary>
<value>
<see langword="false" /> if the object was created by a constructor with an <paramref name="access" /> parameter value that supports writing or was created by a constructor that had no parameters, or if the stream is closed; otherwise, <see langword="true" />.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This property indicates whether the current stream object supports writing.
## Examples
The following code example demonstrates how to read from and write to unmanaged memory using the <xref:System.IO.UnmanagedMemoryStream> class. A block of unmanaged memory is allocated and de-allocated using the <xref:System.Runtime.InteropServices.Marshal> class. In this example, an <xref:System.IO.UnmanagedMemoryStream> object is passed to a method which checks the <xref:System.IO.UnmanagedMemoryStream.CanWrite%2A> property before attempting to write the data to the stream.
:::code language="csharp" source="~/snippets/csharp/System.IO/UnmanagedMemoryStream/.ctor/program.cs" id="Snippet00":::
]]></format>
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<MemberSignature Language="ILAsm" Value=".property instance int64 Capacity" />
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<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.0.0</AssemblyVersion>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
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<AssemblyName>mscorlib</AssemblyName>
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<AssemblyVersion>2.1.0.0</AssemblyVersion>
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<AssemblyVersion>4.2.0.0</AssemblyVersion>
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<AssemblyName>System.Runtime</AssemblyName>
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<AssemblyVersion>7.0.0.0</AssemblyVersion>
<AssemblyVersion>8.0.0.0</AssemblyVersion>
<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<ReturnValue>
<ReturnType>System.Int64</ReturnType>
</ReturnValue>
<Docs>
<summary>Gets the stream length (size) or the total amount of memory assigned to a stream (capacity).</summary>
<value>The size or capacity of the stream.</value>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This property returns the `capacity` value provided to the constructor. If no `capacity` value was specified when the stream was initialized, this property returns the stream length.
]]></format>
</remarks>
<exception cref="T:System.ObjectDisposedException">The stream is closed.</exception>
</Docs>
</Member>
<Member MemberName="Dispose">
<MemberSignature Language="C#" Value="protected override void Dispose (bool disposing);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig virtual instance void Dispose(bool disposing) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.Dispose(System.Boolean)" />
<MemberSignature Language="VB.NET" Value="Protected Overrides Sub Dispose (disposing As Boolean)" />
<MemberSignature Language="F#" Value="override this.Dispose : bool -> unit" Usage="unmanagedMemoryStream.Dispose disposing" />
<MemberSignature Language="C++ CLI" Value="protected:
 override void Dispose(bool disposing);" />
<MemberType>Method</MemberType>
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<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;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.SecuritySafeCritical]</AttributeName>
<AttributeName Language="F#">[<System.Security.SecuritySafeCritical>]</AttributeName>
</Attribute>
</Attributes>
<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="disposing" Type="System.Boolean" />
</Parameters>
<Docs>
<param name="disposing">
<see langword="true" /> to release both managed and unmanaged resources; <see langword="false" /> to release only unmanaged resources.</param>
<summary>Releases the unmanaged resources used by the <see cref="T:System.IO.UnmanagedMemoryStream" /> and optionally releases the managed resources.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is called by the public <xref:System.ComponentModel.Component.Dispose> method and the <xref:System.Object.Finalize> method, if it has been overridden. <xref:System.ComponentModel.Component.Dispose> invokes the protected <xref:System.IO.UnmanagedMemoryStream.Dispose%2A> method with the `disposing` parameter set to `true`. `Finalize` invokes <xref:System.IO.UnmanagedMemoryStream.Dispose%2A> with `disposing` set to `false`.
When the `disposing` parameter is `true`, this method releases all resources held by any managed objects that this <xref:System.IO.UnmanagedMemoryStream> references. This method invokes the <xref:System.ComponentModel.Component.Dispose> method of each referenced object.
]]></format>
</remarks>
<block subset="none" type="overrides">
<para>
<see cref="M:System.ComponentModel.Component.Dispose" /> can be called multiple times by other objects. When overriding <see cref="M:System.IO.UnmanagedMemoryStream.Dispose(System.Boolean)" /> be careful not to reference objects that have been previously disposed of in an earlier call to <see cref="M:System.ComponentModel.Component.Dispose" />. For more information about how to implement <see cref="M:System.IO.UnmanagedMemoryStream.Dispose(System.Boolean)" />, see [Implementing a Dispose Method](/dotnet/standard/garbage-collection/implementing-dispose).
For more information about <see cref="M:System.ComponentModel.Component.Dispose" /> and <see cref="M:System.Object.Finalize" />, see [Cleaning Up Unmanaged Resources](/dotnet/standard/garbage-collection/unmanaged).</para>
</block>
</Docs>
</Member>
<Member MemberName="Flush">
<MemberSignature Language="C#" Value="public override void Flush ();" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance void Flush() cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.Flush" />
<MemberSignature Language="VB.NET" Value="Public Overrides Sub Flush ()" />
<MemberSignature Language="F#" Value="override this.Flush : unit -> unit" Usage="unmanagedMemoryStream.Flush " />
<MemberSignature Language="C++ CLI" Value="public:
 override void Flush();" />
<MemberType>Method</MemberType>
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
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<AssemblyVersion>4.0.1.0</AssemblyVersion>
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<AssemblyName>mscorlib</AssemblyName>
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<AssemblyName>netstandard</AssemblyName>
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<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.Void</ReturnType>
</ReturnValue>
<Parameters />
<Docs>
<summary>Overrides the <see cref="M:System.IO.Stream.Flush" /> method so that no action is performed.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method performs no action for this class but is included as part of the <xref:System.IO.Stream> base class. Since any data is written to RAM, this method is redundant.
]]></format>
</remarks>
<exception cref="T:System.ObjectDisposedException">The stream is closed.</exception>
</Docs>
</Member>
<Member MemberName="FlushAsync">
<MemberSignature Language="C#" Value="public override System.Threading.Tasks.Task FlushAsync (System.Threading.CancellationToken cancellationToken);" />
<MemberSignature Language="ILAsm" Value=".method public hidebysig virtual instance class System.Threading.Tasks.Task FlushAsync(valuetype System.Threading.CancellationToken cancellationToken) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.FlushAsync(System.Threading.CancellationToken)" />
<MemberSignature Language="VB.NET" Value="Public Overrides Function FlushAsync (cancellationToken As CancellationToken) As Task" />
<MemberSignature Language="F#" Value="override this.FlushAsync : System.Threading.CancellationToken -> System.Threading.Tasks.Task" Usage="unmanagedMemoryStream.FlushAsync cancellationToken" />
<MemberSignature Language="C++ CLI" Value="public:
 override System::Threading::Tasks::Task ^ FlushAsync(System::Threading::CancellationToken cancellationToken);" />
<MemberType>Method</MemberType>
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<AssemblyVersion>9.0.0.0</AssemblyVersion>
</AssemblyInfo>
<Attributes>
<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-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">
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<AttributeName Language="F#">[<System.Runtime.InteropServices.ComVisible(false)>]</AttributeName>
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<ReturnValue>
<ReturnType>System.Threading.Tasks.Task</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="cancellationToken" Type="System.Threading.CancellationToken" Index="0" FrameworkAlternate="dotnet-uwp-10.0;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-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" />
</Parameters>
<Docs>
<param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="P:System.Threading.CancellationToken.None" />.</param>
<summary>Overrides the <see cref="M:System.IO.Stream.FlushAsync(System.Threading.CancellationToken)" /> method so that the operation is cancelled if specified, but no other action is performed.</summary>
<returns>A task that represents the asynchronous flush operation.</returns>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
If the operation isn't cancelled, the <xref:System.IO.UnmanagedMemoryStream> calls the <xref:System.IO.UnmanagedMemoryStream.Flush%2A> method, which means that no action performed.
This method stores in the task it returns all non-usage exceptions that the method's synchronous counterpart can throw. If an exception is stored into the returned task, that exception will be thrown when the task is awaited. Usage exceptions, such as <xref:System.ArgumentException>, are still thrown synchronously. For the stored exceptions, see the exceptions thrown by <xref:System.IO.UnmanagedMemoryStream.Flush>.
]]></format>
</remarks>
<exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>
</Docs>
</Member>
<MemberGroup MemberName="Initialize">
<AssemblyInfo>
<AssemblyName>System.IO.UnmanagedMemoryStream</AssemblyName>
<AssemblyVersion>4.0.1.0</AssemblyVersion>
</AssemblyInfo>
<Docs>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class in a safe buffer, or by using a pointer to an unmanaged memory location.</summary>
</Docs>
</MemberGroup>
<Member MemberName="Initialize">
<MemberSignature Language="C#" Value="protected void Initialize (byte* pointer, long length, long capacity, System.IO.FileAccess access);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig instance void Initialize(unsigned int8* pointer, int64 length, int64 capacity, valuetype System.IO.FileAccess access) cil managed" />
<MemberSignature Language="DocId" Value="M:System.IO.UnmanagedMemoryStream.Initialize(System.Byte*,System.Int64,System.Int64,System.IO.FileAccess)" />
<MemberSignature Language="F#" Value="member this.Initialize : nativeptr<byte> * int64 * int64 * System.IO.FileAccess -> unit" Usage="unmanagedMemoryStream.Initialize (pointer, length, capacity, access)" />
<MemberSignature Language="C++ CLI" Value="protected:
 void Initialize(System::Byte* pointer, long length, long capacity, System::IO::FileAccess access);" />
<MemberType>Method</MemberType>
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<Attributes>
<Attribute FrameworkAlternate="dotnet-uwp-10.0;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-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.CLSCompliant(false)]</AttributeName>
<AttributeName Language="F#">[<System.CLSCompliant(false)>]</AttributeName>
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<Attribute FrameworkAlternate="dotnet-uwp-10.0;netcore-1.0;netcore-1.1;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>
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<ReturnValue>
<ReturnType>System.Void</ReturnType>
</ReturnValue>
<Parameters>
<Parameter Name="pointer" Type="System.Byte*" />
<Parameter Name="length" Type="System.Int64" />
<Parameter Name="capacity" Type="System.Int64" />
<Parameter Name="access" Type="System.IO.FileAccess" />
</Parameters>
<Docs>
<param name="pointer">A pointer to an unmanaged memory location.</param>
<param name="length">The length of the memory to use.</param>
<param name="capacity">The total amount of memory assigned to the stream.</param>
<param name="access">One of the <see cref="T:System.IO.FileAccess" /> values.</param>
<summary>Initializes a new instance of the <see cref="T:System.IO.UnmanagedMemoryStream" /> class by using a pointer to an unmanaged memory location.</summary>
<remarks>
<format type="text/markdown"><![CDATA[
## Remarks
This method is equivalent to the <xref:System.IO.UnmanagedMemoryStream.%23ctor%2A> constructor. It supports methods that need to initialize the pointer before setting stream variables and, therefore, cannot call the parameterized constructor. Such methods should use the parameterless constructor, <xref:System.IO.UnmanagedMemoryStream.%23ctor>, initialize the pointer, and then invoke the <xref:System.IO.UnmanagedMemoryStream.Initialize%2A> method.
]]></format>
</remarks>
<exception cref="T:System.Security.SecurityException">The user does not have the required permission.</exception>
<exception cref="T:System.ArgumentNullException">The <paramref name="pointer" /> value is <see langword="null" />.</exception>
<exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="length" /> value is less than zero.
-or-
The <paramref name="capacity" /> value is less than zero.
-or-
The <paramref name="length" /> value is large enough to cause an overflow.</exception>
</Docs>
</Member>
<Member MemberName="Initialize">
<MemberSignature Language="C#" Value="protected void Initialize (System.Runtime.InteropServices.SafeBuffer buffer, long offset, long length, System.IO.FileAccess access);" />
<MemberSignature Language="ILAsm" Value=".method familyhidebysig instance void Initialize(class System.Runtime.InteropServices.SafeBuffer buffer, int64 offset, int64 length, valuetype System.IO.FileAccess access) cil managed" />
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<MemberSignature Language="VB.NET" Value="Protected Sub Initialize (buffer As SafeBuffer, offset As Long, length As Long, access As FileAccess)" />
<MemberSignature Language="F#" Value="member this.Initialize : System.Runtime.InteropServices.SafeBuffer * int64 * int64 * System.IO.FileAccess -> unit" Usage="unmanagedMemoryStream.Initialize (buffer, offset, length, access)" />
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 void Initialize(System::Runtime::InteropServices::SafeBuffer ^ buffer, long offset, long length, System::IO::FileAccess access);" />
<MemberType>Method</MemberType>
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