Wcf REST Exceptions:-

We can send the exceptions from wcf REST to  client using WebFaultException or by using WebProtocolException which comes in wcf REST starter kit.The following example demonstrates the WebProtocolException implementation.

In wcf REST starter kit we get Microsoft.ServiceModel.Web dll file which gives features like throwing exceptions and authentication.

To get the features of wcf REST starter kit in IIS hosted services you should add the factory in ServiceHost file like below.

<%@ ServiceHost Language="C#" Debug="true" Service="WcfRESTException.Service" CodeBehind="Service.svc.cs"  Factory="Microsoft.ServiceModel.Web.WebServiceHost2Factory"%>

->Create a custom exception class with property Description.

    [DataContract]

    public class CustomException

    {

        [DataMember]

        public string Description { get; set; }

    }

->Create wcf REST service with SayHello method.

[ServiceContract]

public class Service

{

        [OperationContract]

        [WebGet(ResponseFormat = WebMessageFormat.Json)]

        public string SayHello(string name)

        {

            //Create custom exception object with proper error description.

            CustomException objCustomException = new CustomException();

            objCustomException.Description = "error description";

            //Throw the exception.

            throw new WebProtocolException(HttpStatusCode.BadRequest, "", objCustomException, null, null);

            //Return string.

            return "Hello " + name;

        }

}
->There is no need of web.config file modification.Wcf Rest starter kit do it for you.

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