Fault Exception in WCF

WCF provides FaultException class that can be used to send exception details to client.

1. Through Exception class object from service 

<serviceDebug includeExceptionDetailInFaults="false"/>

2. Using default FaultException

Through Default FaultException class object from service

throw new FaultException(ex.Message);

OR

Enable includeExceptionDetailInFaults in config
<serviceDebug includeExceptionDetailInFaults="true"/>

3. Through Custom class object (Fault contract) using FaultException class

Service Code:

    [ServiceContract]

    public interface IService1

    {

        [OperationContract]

        [FaultContract(typeof(ClsCustomException))]

        int CalculateCost(string itemCount);

    }

    [DataContract]

    public class ClsCustomException

    {

        [DataMember]

        public string Message { get; set; }

        [DataMember]

        public string Description { get; set; }

        [DataMember]

        public string StackTrace { get; set; }

    }

    public int CalculateCost(string itemCount)

    {

        try

        {

            return int.Parse(itemCount) * 120;

        }

        catch (Exception ex)

        {

            //Without fault exception

            //throw ex;

            //Simple fault exception sending message only to client side

            //throw new FaultException(ex.Message);

            //Fault contract (using our custom class to send details of exception to client)

            ClsCustomException objMyException = new ClsCustomException();

            objMyException.Message = ex.Message;

            objMyException.Description = "Error in itemCount conversion to int";

            objMyException.StackTrace = ex.StackTrace;

            throw new FaultException<ClsCustomException>(objMyException);

        }

    }

Client Code:

        static void Main(string[] args)

        {

            ServiceReference1.Service1Client _client = new ServiceReference1.Service1Client();

            try

            {

                Console.WriteLine("Enter number...");

                Console.WriteLine( _client.CalculateCost(Console.ReadLine()));

                Console.ReadLine();

            }

            catch (FaultException<ServiceReference1.ClsCustomException> ex)

            {

                Console.WriteLine(ex.Message);

                Console.WriteLine(ex.Detail.Description);

                Console.WriteLine(ex.Detail.StackTrace);

                Console.ReadLine();

            }

        }