Begins an asynchronous write.
Assembly: mscorlib (in mscorlib.dll)
[HostProtectionAttribute(SecurityAction.LinkDemand, ExternalThreading = true)] public override IAsyncResult BeginWrite( byte buffer, int offset, int numBytes, AsyncCallback userCallback, Object stateObject )
- Type: System.Byte
The buffer to write data to.
- Type: System.Int32
The byte offset in buffer at which to begin writing.
- Type: System.Int32
The maximum number of bytes to write.
- Type: System.AsyncCallback
The method to call when the asynchronous write operation is completed. This parameter is optional.
- Type: System.Object
The status of the asynchronous write.
Return ValueType: System.IAsyncResult
An IAsyncResult that represents the asynchronous write, which is possibly still pending. This IAsyncResult must be passed to this stream's EndWrite method to ensure that the write is complete, then frees resources appropriately. This can be done either by the same code that called BeginWrite or in a callback passed to BeginWrite.
An asynchronous write was attempted past the end of the file.
The HostProtectionAttribute attribute applied to this type or member has the following Resources property value: ExternalThreading. The HostProtectionAttribute does not affect desktop applications (which are typically started by double-clicking an icon, typing a command, or entering a URL in a browser). For more information, see the HostProtectionAttribute class or SQL Server Programming and Host Protection Attributes.
If a IsolatedStorageFileStream object is writable, writing at the end of the stream expands the stream.
The current position in the stream is updated when you issue the asynchronous read or write, not when the I/O operation completes.
Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.