After inspecting parameters in wcf , parameter received by called method is null , why ? and how to get it back in method ?

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C#

WCFServices

a)create a method public string GetData(inputParameters value)
b)created parameter inspector that is working fine.
c) when control goes from BeforeCall() method to GetData(inputParameters ) , inputParameters value is null in GetData method , how can i get parameter value here ? plese suggest asap.




1. created a method to intercept its parameters.

        [CustomDataOperationBehavior]
       [WebInvoke(Method="POST", UriTemplate = "GetData",RequestFormat=WebMessageFormat.Json ,ResponseFormat =  WebMessageFormat.Json)]
       [OperationContract]
       string GetData(inputParameters value);


public string GetData(inputParameters value)
       {
           return value.Name;
       }

2.

public class ParameterValidator : IParameterInspector
    {

        public object BeforeCall(string operationName, object[] inputs)
        {
            if (((IntercepterDemo.inputParameters)(inputs[0])).Name == "Test")
            {
                return null;
                // return inputs
            }
            else
            {
                throw new FaultException("Fail");
            }            
        }

        public void AfterCall(string operationName, object[] outputs, object returnValue, object correlationState)
        {
        }
    }

3.

public class CustomDataOperationBehavior : Attribute, IOperationBehavior
    {
        public void ApplyDispatchBehavior(OperationDescription operationDescription, System.ServiceModel.Dispatcher.DispatchOperation dispatchOperation)
        {
            dispatchOperation.ParameterInspectors.Add(new ParameterValidator());
        }

        public void AddBindingParameters(OperationDescription operationDescription, System.ServiceModel.Channels.BindingParameterCollection bindingParameters)
        {
        }

        public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation)
        {           
        }
        public void Validate(OperationDescription operationDescription)
        {
        }

    }

4.

[DataContract]
    public class MyExceptionContainer
    {
        [DataMember]
        public string Messsage { get; set; }
        [DataMember]
        public string Description { get; set; }
    }