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Stream.EndWrite(IAsyncResult) Method


Ends an asynchronous write operation. (Consider using WriteAsync(Byte[], Int32, Int32) instead.)

 virtual void EndWrite(IAsyncResult ^ asyncResult);
public virtual void EndWrite (IAsyncResult asyncResult);
abstract member EndWrite : IAsyncResult -> unit
override this.EndWrite : IAsyncResult -> unit
Public Overridable Sub EndWrite (asyncResult As IAsyncResult)



A reference to the outstanding asynchronous I/O request.


asyncResult is null.

A handle to the pending write operation is not available.


The pending operation does not support writing.

asyncResult did not originate from a BeginWrite(Byte[], Int32, Int32, AsyncCallback, Object) method on the current stream.

The stream is closed or an internal error has occurred.


In the .NET Framework 4 and earlier versions, you have to use methods such as BeginWrite and EndWrite to implement asynchronous I/O operations. These methods are still available in the .NET Framework 4.5 to support legacy code; however, the new async methods, such as ReadAsync, WriteAsync, CopyToAsync, and FlushAsync, help you implement asynchronous I/O operations more easily.

EndWrite must be called exactly once on every IAsyncResult from BeginWrite.

This method blocks until the I/O operation has completed. Errors that occur during an asynchronous write request, such as a disk failure during the I/O request, occur on the thread pool thread and become visible upon a call to EndWrite. Exceptions thrown by the thread pool thread will not be visible when calling EndWrite.

Applies to

See also