Exception handling in ASP.NET (C#) web services

Question

I was looking for a way to transfer the exception message in web services of my asp.net application to the ajax error callback function. All I could find was catching an exception thrown from web service into a C# code but i am calling my service from ajax code and not a C# code. I want something more than the HTTP status codes returned.
Here is catch block of my Service code:

catch (Exception ex)
        {
            var fault = new GenericFault { Message = ex.Message, Operation = "" };
            throw new FaultException<GenericFault>(fault);
        }
    }

And here is my ajax error callback:

 error: function (err) {
         alert("The server encountered an error, please resubmit your request. If the problem persists, contact your administrator.");
         return 'error occured';
    }

I have already tried throwing web fault exception but that also didn't serve the purpose as only the HTTP status code gets passed.

Usually the parameter passed to the Error callback has a number of properties, including message/stack trace/status code/exception. What exactly is the issue? — Nunners
– Nunners, Commented Nov 4, 2014 at 7:56
thanks @Nunners i got the problem issue was ia was throwing fault exception which does not update the properties of error callback..updated the answer below — Aashish Kumar
– Aashish Kumar, Commented Nov 4, 2014 at 9:40

Aashish Kumar · Accepted Answer · 2014-11-04 09:34:47Z

3

Found an answer. The trick lies in throwing right exception.
As the error caught in the callback error function sees the details in xhr object.
So you need to throw the HttpException passing with it status code and string message. catch block should look something like:

catch (Exception ex)
        {
             throw new HttpException(500, ex.Message);

          }

then your ajax callback will get the ex.message that you are passing from here:

error: function (err) {
     alert("The Detailed server error is "+err.responseJSON.Message);
     return 'error occured';
}

answered Nov 4, 2014 at 9:34

Aashish Kumar

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