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OpenReadCompletedEventHandler Delegate

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

Namespace:  System.Net
Assembly:  System (in System.dll)
public delegate void OpenReadCompletedEventHandler(
	Object sender,
	OpenReadCompletedEventArgs e
)

Parameters

sender
Type: System.Object

The source of the event.

e
Type: System.Net.OpenReadCompletedEventArgs

A OpenReadCompletedEventArgs containing event data.

When you create a OpenReadCompletedEventHandler 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.

The following code example demonstrates downloading a resource for reading.

public static void OpenResourceForReading2 (string address)
{
    WebClient client = new WebClient ();
    Uri uri = new Uri(address);

    client.OpenReadCompleted += new OpenReadCompletedEventHandler(OpenReadCallback2);
    client.OpenReadAsync (uri);
}
void OpenResourceForReading2 (String* address)
{
    WebClient* client = new WebClient ();
    client->OpenReadCompleted += new OpenReadCompletedEventHandler (OpenReadCallback2);
    client->OpenReadAsync (address);
}

The following method is called when the download completes.

private static void OpenReadCallback2 (Object sender, OpenReadCompletedEventArgs e)
{
    Stream reply = null;
    StreamReader s = null;

    try
    {
        reply = (Stream)e.Result;
        s = new StreamReader (reply);
        Console.WriteLine (s.ReadToEnd ());
    }
    finally
    {
        if (s != null)
        {
            s.Close ();
        }

        if (reply != null)
        {
            reply.Close ();
        }
    }
}
void OpenReadCallback2 (Object* /*sender*/, OpenReadCompletedEventArgs* e)
{
    Stream* reply = 0;
    StreamReader* s = 0;

    try
    {
        reply = dynamic_cast<Stream*>(e->Result);
        s = new StreamReader (reply);
        Console::WriteLine (s->ReadToEnd ());
    }
    __finally
    {
        if (s != 0)
        {
            s->Close ();
        }

        if (reply != 0)
        {
            reply->Close ();
        }
    }
}

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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