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OpenWriteCompletedEventArgs Class
Visual Studio 2010
Provides data for the OpenWriteCompleted event.
System::Object
System::EventArgs
System.ComponentModel::AsyncCompletedEventArgs
System.Net::OpenWriteCompletedEventArgs
System::EventArgs
System.ComponentModel::AsyncCompletedEventArgs
System.Net::OpenWriteCompletedEventArgs
Assembly: System (in System.dll)
The OpenWriteCompletedEventArgs type exposes the following members.
| Name | Description | |
|---|---|---|
![]() ![]() | Cancelled | Gets a value indicating whether an asynchronous operation has been canceled. (Inherited from AsyncCompletedEventArgs.) |
![]() ![]() | Error | Gets a value indicating which error occurred during an asynchronous operation. (Inherited from AsyncCompletedEventArgs.) |
![]() ![]() | Result | Gets a writable stream that is used to send data to a server. |
![]() ![]() | UserState | Gets the unique identifier for the asynchronous task. (Inherited from AsyncCompletedEventArgs.) |
| Name | Description | |
|---|---|---|
![]() ![]() | Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
![]() ![]() | Finalize | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection. (Inherited from Object.) |
![]() ![]() | GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
![]() ![]() | GetType | Gets the Type of the current instance. (Inherited from Object.) |
![]() ![]() | MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
![]() ![]() | RaiseExceptionIfNecessary | Raises a user-supplied exception if an asynchronous operation failed. (Inherited from AsyncCompletedEventArgs.) |
![]() ![]() | ToString | Returns a string that represents the current object. (Inherited from Object.) |
Instances of this class are passed to OpenWriteCompletedEventHandler methods.
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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