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OpenReadCompletedEventHandler Delegate

.NET Framework 4.5

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.

Remarks

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.

Examples

The following code example demonstrates downloading a resource for reading.

C++

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

        client.OpenReadCompleted += new OpenReadCompletedEventHandler(OpenReadCallback2);
        client.OpenReadAsync (uri);
    }

The following method is called when the download completes.

C++

    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 ();
            }
        }
    }

Version Information

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Platforms

Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

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

Reference

System.Net Namespace

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