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FileStream.EndWrite Method

Ends an asynchronous write, blocking until the I/O operation has completed.

Namespace:  System.IO
Assembly:  mscorlib (in mscorlib.dll)

public override void EndWrite(
	IAsyncResult asyncResult


Type: System.IAsyncResult

The pending asynchronous I/O request.


asyncResult is null.


This IAsyncResult object was not created by calling BeginWrite on this class.


EndWrite is called multiple times.


The stream is closed or an internal error has occurred.

This method overrides EndWrite.

EndWrite must be called exactly once on every IAsyncResult from BeginWrite. EndWrite will block until the I/O operation has completed.

For a list of common I/O tasks, see Common I/O Tasks.

Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows CE Platform Note: In .NET Compact Framework applications, this method is supported, but it is reserved for future use. Using this method will raise a NotSupportedException until it becomes available in a future release.

This code example is part of a larger example provided for the FileStream(String, FileMode, FileAccess, FileShare, Int32, Boolean) constructor.

static void EndWriteCallback(IAsyncResult asyncResult)
    State tempState = (State)asyncResult.AsyncState;
    FileStream fStream = tempState.FStream;

    // Asynchronously read back the written data.
    fStream.Position = 0;
    asyncResult = fStream.BeginRead(
        tempState.ReadArray, 0 , tempState.ReadArray.Length, 
        new AsyncCallback(EndReadCallback), tempState);

    // Concurrently do other work, such as  
    // logging the write operation.

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.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0