FtpWebRequest.EndGetRequestStream Method (IAsyncResult)


Ends a pending asynchronous operation started with BeginGetRequestStream.

Namespace:   System.Net
Assembly:  System (in System.dll)

public override Stream EndGetRequestStream(
	IAsyncResult asyncResult


Type: System.IAsyncResult

The IAsyncResult object that was returned when the operation started.

Return Value

Type: System.IO.Stream

A writable Stream instance associated with this instance.

Exception Condition

asyncResult is null.


asyncResult was not obtained by calling BeginGetRequestStream.


This method was already called for the operation identified by asyncResult.

If the operation has not completed, the EndGetRequestStream method blocks until the operation completes. To determine whether the operation has completed, check the IsCompleted property before calling EndGetRequestStream.

In addition to the exceptions noted in "Exceptions," EndGetRequestStream rethrows exceptions that were thrown while opening the stream for writing.


This member outputs trace information when you enable network tracing in your application. For more information, see Network Tracing in the .NET Framework.

The following code example demonstrates ending an asynchronous operation to get a request's stream. This code example is part of a larger example provided for the FtpWebRequest class overview.

private static void EndGetStreamCallback(IAsyncResult ar)
    FtpState state = (FtpState) ar.AsyncState;

    Stream requestStream = null;
    // End the asynchronous call to get the request stream.
        requestStream = state.Request.EndGetRequestStream(ar);
        // Copy the file contents to the request stream.
        const int bufferLength = 2048;
        byte[] buffer = new byte[bufferLength];
        int count = 0;
        int readBytes = 0;
        FileStream stream = File.OpenRead(state.FileName);
            readBytes = stream.Read(buffer, 0, bufferLength);
            requestStream.Write(buffer, 0, readBytes);
            count += readBytes;
        while (readBytes != 0);
        Console.WriteLine ("Writing {0} bytes to the stream.", count);
        // IMPORTANT: Close the request stream before sending the request.
        // Asynchronously get the response to the upload request.
            new AsyncCallback (EndGetResponseCallback), 
    // Return exceptions to the main application thread.
    catch (Exception e)
        Console.WriteLine("Could not get the request stream.");
        state.OperationException = e;


.NET Framework
Available since 2.0
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