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OpenWriteCompletedEventHandler Delegate
Visual Studio 2010
Represents the method that will handle the OpenWriteCompleted event of a WebClient.
Assembly: System (in System.dll)
public delegate void OpenWriteCompletedEventHandler( Object^ sender, OpenWriteCompletedEventArgs^ e )
Parameters
- sender
- Type: System::Object
The source of the event.
- e
- Type: System.Net::OpenWriteCompletedEventArgs
A OpenWriteCompletedEventArgs containing event data.
The following code example demonstrates opening a stream to write data to be uploaded.
void OpenResourceForPosting( String^ address ) { WebClient^ client = gcnew WebClient; Uri ^uri = gcnew Uri(address); // Specify that the OpenWriteCallback method gets called // when the writeable stream is available. client->OpenWriteCompleted += gcnew 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.
void OpenWriteCallback2( Object^ /*sender*/, OpenWriteCompletedEventArgs^ e ) { Stream^ body = nullptr; StreamWriter^ s = nullptr; try { body = dynamic_cast<Stream^>(e->Result); s = gcnew StreamWriter( body ); s->AutoFlush = true; s->Write( "This is content data to be sent to the server." ); } finally { if ( s != nullptr ) { s->Close(); } if ( body != nullptr ) { body->Close(); } } }
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.
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