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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)

'Declaration
Public Delegate Sub OpenReadCompletedEventHandler ( _
	sender As Object, _
	e As OpenReadCompletedEventArgs _
)

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 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



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



.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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

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