Silverlight - WCF Exception Handling

We cannot handle WCF exception handling(using Fault Exception) in Silverlight in routine way. I mean when you pass fault exception to client silverlight applcation it does not get exception details through fault contract. For this we have to change HttpStatusCode from 500 to 200[OK].

Follow below stuff to get it done

<DataContract()> _

Public Class MYFaultException

Private _reason As String

Private _code As String

<DataMember()> _

Public Property Reason() As String

Get

Return _reason

End Get

Set(ByVal value As String)

_reason = value

End Set

End Property

<DataMember()> _

Public Property Code() As String

Get

Return _code

End Get

Set(ByVal value As String)

_code = value

End Set

End Property

End Class

Public Class SilverlightFaultBehavior

Inherits BehaviorExtensionElement

Implements IEndpointBehavior

'Public Sub ApplyDispatchBehavior(ByVal endpoint As ServiceEndpoint, ByVal endpointDispatcher As EndpointDispatcher)

' Dim inspector As New SilverlightFaultMessageInspector()

' endpointDispatcher.DispatchRuntime.MessageInspectors.Add(inspector)

'End Sub

Public Class SilverlightFaultMessageInspector

Implements IDispatchMessageInspector

Public Sub BeforeSendReply(ByRef reply As Message, ByVal correlationState As Object) Implements System.ServiceModel.Dispatcher.IDispatchMessageInspector.BeforeSendReply

If reply.IsFault Then

Dim [property] As New HttpResponseMessageProperty()

' Here the response code is changed to 200.

[property].StatusCode = System.Net.HttpStatusCode.OK

reply.Properties(HttpResponseMessageProperty.Name) = [property]

End If

End Sub

Public Function AfterReceiveRequest(ByRef request As System.ServiceModel.Channels.Message, ByVal channel As System.ServiceModel.IClientChannel, ByVal instanceContext As System.ServiceModel.InstanceContext) As Object Implements System.ServiceModel.Dispatcher.IDispatchMessageInspector.AfterReceiveRequest

Return Nothing

End Function

End Class

' The following methods are stubs and not relevant.

Public Overrides ReadOnly Property BehaviorType() As System.Type

Get

Return GetType(SilverlightFaultBehavior)

End Get

End Property

Protected Overrides Function CreateBehavior() As Object

Return New SilverlightFaultBehavior()

End Function

Public Sub AddBindingParameters(ByVal endpoint As System.ServiceModel.Description.ServiceEndpoint, ByVal bindingParameters As System.ServiceModel.Channels.BindingParameterCollection) Implements System.ServiceModel.Description.IEndpointBehavior.AddBindingParameters

End Sub

Public Sub ApplyClientBehavior(ByVal endpoint As System.ServiceModel.Description.ServiceEndpoint, ByVal clientRuntime As System.ServiceModel.Dispatcher.ClientRuntime) Implements System.ServiceModel.Description.IEndpointBehavior.ApplyClientBehavior

End Sub

Public Sub ApplyDispatchBehavior(ByVal endpoint As System.ServiceModel.Description.ServiceEndpoint, ByVal endpointDispatcher As System.ServiceModel.Dispatcher.EndpointDispatcher) Implements System.ServiceModel.Description.IEndpointBehavior.ApplyDispatchBehavior

Dim inspector As New SilverlightFaultMessageInspector()

endpointDispatcher.DispatchRuntime.MessageInspectors.Add(inspector)

End Sub

Public Sub Validate(ByVal endpoint As System.ServiceModel.Description.ServiceEndpoint) Implements System.ServiceModel.Description.IEndpointBehavior.Validate

End Sub

End Class

-----------------------------START SERVICE CONTRACT---------------------------

<ServiceContract()> _

Public Interface IService1

<OperationContract()> _

<FaultContract(GetType(MYFaultException))> _

Function GetData(ByVal value As Integer) As String

<OperationContract()> _

Function GetDataUsingDataContract(ByVal composite As CompositeType) As CompositeType

' TODO: Add your service operations here

End Interface

-----------------------------END SERVICE CONTRACT---------------------------

-----------------------------WEB CONFIG SETTINGS ---------------------------

<system.serviceModel>

<extensions>

<behaviorExtensions>

<add name="silverlightFaults"

type="WcfService1.SilverlightFaultBehavior, WcfService1, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null"/>

</behaviorExtensions>

</extensions>

<behaviors>

<endpointBehaviors>

<behavior name="SilverlightFaultBehavior">

<silverlightFaults/>

</behavior>

</endpointBehaviors>

<serviceBehaviors>

<behavior name="SilverlightFaultBehavior">

<serviceDebug includeExceptionDetailInFaults="true"/>

<serviceMetadata httpGetEnabled="true"/>

</behavior>

</serviceBehaviors>

</behaviors>

<services>

<service name="WcfService1.Service1" behaviorConfiguration="SilverlightFaultBehavior">

<endpoint address=""

binding="basicHttpBinding"

contract="WcfService1.IService1"

behaviorConfiguration="SilverlightFaultBehavior" />

<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />

</service>

</services>

</system.serviceModel>

-----------------------------END WEB CONFIG SETTINGS ---------------------------

-----------------------------IN SILVERLIGHT APP ---------------------------

Private Sub serProxy_GetData(ByVal sender As Object, ByVal e As ServiceReference1.GetDataCompletedEventArgs)

If e.Error Is Nothing Then

txtErrorMessage.Text = e.Result

Else

txtErrorMessage.Text = e.Error.Message

End If

End Sub

-----------------------------END IN SILVERLIGHT APP ---------------------------