DownloadDataCompletedEventArgs DownloadDataCompletedEventArgs DownloadDataCompletedEventArgs DownloadDataCompletedEventArgs Class

Definition

Provides data for the DownloadDataCompleted event.

public ref class DownloadDataCompletedEventArgs : System::ComponentModel::AsyncCompletedEventArgs
public class DownloadDataCompletedEventArgs : System.ComponentModel.AsyncCompletedEventArgs
type DownloadDataCompletedEventArgs = class
    inherit AsyncCompletedEventArgs
Public Class DownloadDataCompletedEventArgs
Inherits AsyncCompletedEventArgs
Inheritance
DownloadDataCompletedEventArgsDownloadDataCompletedEventArgsDownloadDataCompletedEventArgsDownloadDataCompletedEventArgs

Examples

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();
}


// Sample call : DownLoadDataInBackground ("http://www.contoso.com/GameScores.html");
public static void DownloadDataInBackground (string address)
{
    System.Threading.AutoResetEvent waiter = new System.Threading.AutoResetEvent (false);
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    // Specify that the DownloadDataCallback method gets called
    // when the download completes.
    client.DownloadDataCompleted += new 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 ();
}

'  Sample call : DownLoadDataInBackground ("http:' www.contoso.com/GameScores.html")
Public Shared Sub DownloadDataInBackground(ByVal address As String)

	Dim waiter As System.Threading.AutoResetEvent = New System.Threading.AutoResetEvent(False)
	Dim client As WebClient = New WebClient()

	'  Specify that the DownloadDataCallback method gets called
	'  when the download completes.
	AddHandler client.DownloadDataCompleted, AddressOf DownloadDataCallback
                      Dim uri as Uri = New Uri(address)
	client.DownloadDataAsync(uri, waiter)

	'  Block the main application thread. Real applications
	'  can perform other tasks while waiting for the download to complete.
	waiter.WaitOne()
End Sub

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();
   }

}


private static void DownloadDataCallback (Object sender, DownloadDataCompletedEventArgs e)
{
    System.Threading.AutoResetEvent waiter = (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 == null)
        {
            byte[] data = (byte[])e.Result;
            string textData = System.Text.Encoding.UTF8.GetString (data);

            Console.WriteLine (textData);
        }
    }
    finally
    {
        // Let the main application thread resume.
        waiter.Set ();
    }
}

Private Shared Sub DownloadDataCallback(ByVal sender As Object, ByVal e As DownloadDataCompletedEventArgs)

    Dim waiter As System.Threading.AutoResetEvent = CType(e.UserState, System.Threading.AutoResetEvent)

    Try

        '  If the request was not canceled and did not throw
        '  an exception, display the resource.
        If e.Cancelled = False AndAlso e.Error Is Nothing Then

            Dim data() As Byte = CType(e.Result, Byte())
            Dim textData As String = System.Text.Encoding.UTF8.GetString(data)

            Console.WriteLine(textData)
        End If
    Finally

        '  Let the main application thread resume.
        waiter.Set()
    End Try
End Sub

Remarks

Instances of this class are passed to the DownloadDataCompletedEventHandler.

Properties

Cancelled Cancelled Cancelled Cancelled

Gets a value indicating whether an asynchronous operation has been canceled.

(Inherited from AsyncCompletedEventArgs)
Error Error Error Error

Gets a value indicating which error occurred during an asynchronous operation.

(Inherited from AsyncCompletedEventArgs)
Result Result Result Result

Gets the data that is downloaded by a DownloadDataAsync method.

UserState UserState UserState UserState

Gets the unique identifier for the asynchronous task.

(Inherited from AsyncCompletedEventArgs)

Methods

Equals(Object) Equals(Object) Equals(Object) Equals(Object)

Determines whether the specified object is equal to the current object.

(Inherited from Object)
GetHashCode() GetHashCode() GetHashCode() GetHashCode()

Serves as the default hash function.

(Inherited from Object)
GetType() GetType() GetType() GetType()

Gets the Type of the current instance.

(Inherited from Object)
MemberwiseClone() MemberwiseClone() MemberwiseClone() MemberwiseClone()

Creates a shallow copy of the current Object.

(Inherited from Object)
RaiseExceptionIfNecessary() RaiseExceptionIfNecessary() RaiseExceptionIfNecessary() RaiseExceptionIfNecessary()

Raises a user-supplied exception if an asynchronous operation failed.

(Inherited from AsyncCompletedEventArgs)
ToString() ToString() ToString() ToString()

Returns a string that represents the current object.

(Inherited from Object)

Applies to