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OpenWriteCompletedEventArgs Class

Provides data for the OpenWriteCompleted event.

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

public class OpenWriteCompletedEventArgs : AsyncCompletedEventArgs

The OpenWriteCompletedEventArgs type exposes the following members.

  NameDescription
Public propertySupported by Portable Class LibraryCancelledGets a value indicating whether an asynchronous operation has been canceled. (Inherited from AsyncCompletedEventArgs.)
Public propertySupported by Portable Class LibraryErrorGets a value indicating which error occurred during an asynchronous operation. (Inherited from AsyncCompletedEventArgs.)
Public propertySupported by Portable Class LibraryResultGets a writable stream that is used to send data to a server.
Public propertySupported by Portable Class LibraryUserStateGets the unique identifier for the asynchronous task. (Inherited from AsyncCompletedEventArgs.)
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  NameDescription
Public methodSupported by Portable Class LibraryEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Portable Class LibraryFinalizeAllows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Portable Class LibraryGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Portable Class LibraryGetTypeGets the Type of the current instance. (Inherited from Object.)
Protected methodSupported by Portable Class LibraryMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Protected methodSupported by Portable Class LibraryRaiseExceptionIfNecessaryRaises a user-supplied exception if an asynchronous operation failed. (Inherited from AsyncCompletedEventArgs.)
Public methodSupported by Portable Class LibraryToStringReturns a string that represents the current object. (Inherited from Object.)
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Instances of this class are passed to OpenWriteCompletedEventHandler methods.

The following code example demonstrates opening a stream to write data to be uploaded.


    public static void OpenResourceForPosting (string address)
    {
        WebClient client = new WebClient ();
        Uri uri = new Uri(address);

        // Specify that the OpenWriteCallback method gets called
        // when the writeable stream is available.
        client.OpenWriteCompleted += new OpenWriteCompletedEventHandler (OpenWriteCallback2);
        client.OpenWriteAsync (uri);
        // Applications can perform other tasks
        // while waiting for the upload to complete.
    }



The following method is called when the stream is available.


    private static void OpenWriteCallback2 (Object sender, OpenWriteCompletedEventArgs e)
    {
        Stream body = null;
        StreamWriter s = null;

        try
        {
            body = (Stream)e.Result;
            s = new StreamWriter (body);
            s.AutoFlush = true;
            s.Write ("This is content data to be sent to the server.");
        }
        finally
        {
            if (s != null)
            {
                s.Close ();
            }

            if (body != null)
            {
                body.Close ();
            }
        }
    }



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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