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POUse delegates to Convert wcf service return object
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copied!<p>The function below takes any wcf service method and invokes it.</p> <pre><code>Private Function ServiceCall(ByVal functionToCall As ServiceDelegate(Of IEmpService)) As Object Dim channel As New ChannelFactory(Of IEmpService)(_endPoint) Dim serv As IEmpService Dim result As Object = Nothing Dim mostRecentExp As Exception = Nothing Dim noOfRetries As Integer = My.Settings.NoOfRetries Dim initialDelay As Integer = My.Settings.InitialDelayInMS serv = channel.CreateChannel() For i As Integer = 0 To noOfRetries Try result = functionToCall.Invoke(serv) mostRecentExp = Nothing Exit For Catch cte As ChannelTerminatedException mostRecentExp = cte Thread.Sleep(initialDelay * (i)) Catch enf As EndpointNotFoundException mostRecentExp = enf Thread.Sleep(initialDelay * (i)) Catch stb As ServerTooBusyException mostRecentExp = stb Thread.Sleep(initialDelay * (i)) Catch vf As FaultException(Of ValidationFault) 'no retry Catch exp As Exception 'any other exception mostRecentExp = exp Thread.Sleep(initialDelay * (i)) Finally If channel.State = CommunicationState.Faulted Then channel.Abort() Else channel.Close() End If End Try Next If mostRecentExp IsNot Nothing Then Throw New ServiceExceptions(String.Format("Call to method {0} failed", functionToCall.ToString()), mostRecentExp.InnerException) End If Return result End Function </code></pre> <p>I determine whether a retry is required or not depending on the type of exception I get, which all are fine. the issue I'm facing is <code>result = functionToCall.Invoke(serv)</code> where the result is an object and it can contain a custom error object, and in that case it wont be an exception. to get to the error I can do something similar to: <code>If TypeOf result Is SaveAddressResponse Then ElseIf TypeOf result Is SaveDetailResponse Then End If</code> which looks messy so like to know If I could use delegate to get errors from the <code>return</code> object?</p>

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