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OpenReadCompletedEventArgs Class

Provides data for the OpenReadCompleted event.

Namespace:  System.Net
Assembly:  System (in System.dll)

'Declaration
Public Class OpenReadCompletedEventArgs _
	Inherits AsyncCompletedEventArgs
'Usage
Dim instance As OpenReadCompletedEventArgs

Instances of this class are passed to OpenReadCompletedEventHandler methods.

The following code example demonstrates downloading a resource for reading.

		Public Shared Sub OpenResourceForReading2(ByVal address As String)

			Dim client As WebClient = New WebClient()
			AddHandler client.OpenReadCompleted, AddressOf OpenReadCallback2
                        Dim uri as Uri = New Uri(address)
			client.OpenReadAsync(uri)                        
		End Sub
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 Shared Sub OpenReadCallback2(ByVal sender As Object, ByVal e As OpenReadCompletedEventArgs)

    Dim reply As Stream = Nothing 
    Dim s As StreamReader = Nothing 

    Try

        reply = CType(e.Result, Stream)
        s = New StreamReader(reply)
        Console.WriteLine(s.ReadToEnd())
    Finally 

        If Not s Is Nothing Then

            s.Close()
        End If 

        If Not reply Is Nothing Then

            reply.Close()
        End If 
    End Try 
End Sub
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 ();
        }
    }
}

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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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