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DownloadStringCompletedEventHandler Delegate

Represents the method that will handle the DownloadStringCompleted event of a WebClient.

Namespace:  System.Net
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 );
}
// Sample call : DownloadStringInBackground2 ("http://www.contoso.com/GameScores.html");
void DownloadStringInBackground2 (String* address)
{
    WebClient* client = new WebClient ();

    // Specify that the DownloadStringCallback2 method gets called
    // when the download completes.
    client->DownloadStringCompleted += new DownloadStringCompletedEventHandler (DownloadStringCallback2);
    client->DownloadStringAsync (address);
}

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 );
   }
}
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 == 0)
    {
        String* textString = dynamic_cast<String*>(e->Result);

        Console::WriteLine (textString);
    }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0

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