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DownloadDataCompletedEventArgs Class
Visual Studio 2010
Provides data for the DownloadDataCompleted event.
System::Object
System::EventArgs
System.ComponentModel::AsyncCompletedEventArgs
System.Net::DownloadDataCompletedEventArgs
System::EventArgs
System.ComponentModel::AsyncCompletedEventArgs
System.Net::DownloadDataCompletedEventArgs
Assembly: System (in System.dll)
The DownloadDataCompletedEventArgs 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 the data that is downloaded by a DownloadDataAsync method. |
![]() | 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 the DownloadDataCompletedEventHandler.
The following code example demonstrates downloading a user-specified resource.
// Sample call : DownLoadDataInBackground ("http://www.contoso.com/GameScores.html"); void DownloadDataInBackground( String^ address ) { System::Threading::AutoResetEvent^ waiter = gcnew System::Threading::AutoResetEvent( false ); WebClient^ client = gcnew WebClient; Uri ^uri = gcnew Uri(address); // Specify that the DownloadDataCallback method gets called // when the download completes. client->DownloadDataCompleted += gcnew DownloadDataCompletedEventHandler( DownloadDataCallback ); client->DownloadDataAsync( uri, waiter ); // Block the main application thread. Real applications // can perform other tasks while waiting for the download to complete. waiter->WaitOne(); }
The following method is called when the download completes.
void DownloadDataCallback( Object^ /*sender*/, DownloadDataCompletedEventArgs^ e ) { System::Threading::AutoResetEvent^ waiter = dynamic_cast<System::Threading::AutoResetEvent^>(e->UserState); try { // If the request was not canceled and did not throw // an exception, display the resource. if ( !e->Cancelled && e->Error == nullptr ) { array<Byte>^data = dynamic_cast<array<Byte>^>(e->Result); String^ textData = System::Text::Encoding::UTF8->GetString( data ); Console::WriteLine( textData ); } } finally { // Let the main application thread resume. waiter->Set(); } }
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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