DownloadStringCompletedEventHandler Delegate
Represents the method that will handle the DownloadStringCompleted event of a WebClient.
Assembly: System (in System.dll)
public delegate void DownloadStringCompletedEventHandler( Object^ sender, DownloadStringCompletedEventArgs^ e )
Parameters
- sender
- Type: System::Object
The source of the event.
- e
- Type: System.Net::DownloadStringCompletedEventArgs
A DownloadStringCompletedEventArgs that contains event data.
When you create a DownloadStringCompletedEventHandler delegate, you identify the method that will handle the event. To associate the event with your event handler, add an instance of the delegate to the event. The event handler is called whenever the event occurs, unless you remove the delegate. For more information about event handler delegates, see Events and Delegates.
The following code example demonstrates downloading a string asynchronously.
// Sample call : DownloadStringInBackground2 ("http://www.contoso.com/GameScores.html"); void DownloadStringInBackground2( String^ address ) { WebClient^ client = gcnew WebClient; Uri ^uri = gcnew Uri(address); // Specify that the DownloadStringCallback2 method gets called // when the download completes. client->DownloadStringCompleted += gcnew DownloadStringCompletedEventHandler( DownloadStringCallback2 ); client->DownloadStringAsync( uri ); }
The following method is called when the download completes.
void DownloadStringCallback2( Object^ /*sender*/, DownloadStringCompletedEventArgs^ e ) { // If the request was not canceled and did not throw // an exception, display the resource. if ( !e->Cancelled && e->Error == nullptr ) { String^ textString = dynamic_cast<String^>(e->Result); Console::WriteLine( textString ); } }
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.