calling wcf service from silverlight

**Avanindra** · 06-07-2009

I am using silverlight & is a very good application..... Actually i like the way it calls the web service.... So i just wanted to know how to call WCF service from silverlight...???? Please Help....!

**Modifier** · 06-07-2009

To call WCF service operations asynchronously

Run the ServiceModel Metadata Utility Tool (Svcutil.exe) tool with both the /async and the /tcv:Version35 command options together as shown in the following command.

Code:

      svcutil /n:http://Microsoft.ServiceModel.Samples,Microsoft.ServiceModel.Samples http://localhost:8000/servicemodelsamples/service/mex /a /tcv:Version35

This generates, in addition to the synchronous and standard delegate-based asynchronous operations, a WCF client class that contains:

Two <operationName>Async operations for use with the event-based asynchronous calling approach. For example:

Code:

            Public Overloads Sub AddAsync(ByVal n1 As Double, ByVal n2 As Double)
                Me.AddAsync(n1, n2, Nothing)
            End Sub

            Public Overloads Sub AddAsync(ByVal n1 As Double, ByVal n2 As Double, ByVal userState As Object)
                If (Me.onBeginAddDelegate Is Nothing) Then
                    Me.onBeginAddDelegate = AddressOf Me.OnBeginAdd
                End If
                If (Me.onEndAddDelegate Is Nothing) Then
                    Me.onEndAddDelegate = AddressOf Me.OnEndAdd
                End If
                If (Me.onAddCompletedDelegate Is Nothing) Then
                    Me.onAddCompletedDelegate = AddressOf Me.OnAddCompleted
                End If
                MyBase.InvokeAsync(Me.onBeginAddDelegate, New Object() {n1, n2}, Me.onEndAddDelegate, Me.onAddCompletedDelegate, userState)
            End Sub

Operation completed events of the form <operationName>Completed for use with the event-based asynchronous calling approach. For example:

Code:

Public Event AddCompleted As System.EventHandler(Of AddCompletedEventArgs)

System.EventArgs types for each operation (of the form <operationName>CompletedEventArgs) for use with the event-based asynchronous calling approach. For example:

Code:

<System.Diagnostics.DebuggerStepThroughAttribute(),  _
 System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")>  _
Partial Public Class AddCompletedEventArgs
    Inherits System.ComponentModel.AsyncCompletedEventArgs
    
    Private results() As Object
    
    Public Sub New(ByVal results() As Object, ByVal exception As System.Exception, ByVal cancelled As Boolean, ByVal userState As Object)
        MyBase.New(exception, cancelled, userState)
        Me.results = results
    End Sub
    
    Public ReadOnly Property Result() As Double
        Get
            MyBase.RaiseExceptionIfNecessary
            Return CType(Me.results(0),Double)
        End Get
    End Property
End Class

**MindSpace** · 06-07-2009

Inserting the correct Uri in the silverlight application related on the location. Actually the code looks like this :

Code:

ServiceClient proxy = GetServiceClient();
proxy.DoWorkCompleted += proxy_DoWorkCompleted;
proxy.DoWorkAsync();

 

The GetServiceClient() function :

private ServiceClient GetServiceClient()
{
    Uri uri = new Uri(HtmlPage.Document.DocumentUri, "Service");
    EndpointAddress address = new EndpointAddress(uri);

    return new ServiceClient("*", address);
}