如果IParameterInspector BeforeCall方法失败，如何限制wcf中的Operation方法调用

Question

I using IParameterInspector BeforeCall method to validate the user for the current session and if the validation fails it will throw the exception and has to return. I am able to validate it and throwing the exception and I can see it in AfterCall correlationState parameter, but still it is executing the wcf method which I was calling from client.

Is there is any way to restrict that method call to not hit the wcf method in the IParameterInspector BeforeCall method itself.

my code :

public object BeforeCall(string operationName, object[] inputs)
        {
            if (UserAuthenticToken.IsValidUser())
                return null;
            else
            {                    
                return new FaultException("User is not authenticated.");
            }
        }

Answer 1

You should throw faultexception instead of returning it:

public object BeforeCall(string operationName, object[] inputs)
        {
            if (UserAuthenticToken.IsValidUser())
                return null;
            else
            {                    
                throw new FaultException("User is not authenticated.");
            }
        }