MVC Error Handling with WCF Service - asp.net-mvc

Question

I saw similar post Error Handling with WCF Service and Client Application to my question but I needed more help.
I have a MVC project with the WCF Service. I understand that WCF needs to throw a FaultException. But my question is what is the best way to show the error message created by an error in WCF. I just want to redirect all the errors (possibly all FaultException) to one error page (will be generic) but message will be different.
I also would like to use [HandleError] attribute so that I don't have to implement catching FaultException for all the methods calling the WCF service.

Answer 1

As you know how you can handle WCF exceptions but in my opinion this is better to observe these:
1-This not good idea to show user exactly exception message, this is better to show very understandable message for example "Operation get failed there is may problem with back-end service, try again or notify admin"
2- It's is boring end user to redirect to public error page.
3- This is better show the public prompt to user which tell user that the operation get failed exactly where the user do action not redirect it to another page.
4- At the end If you want to do what you want try these:
try
{
//Call your wcf
}
catch(Exception exp)
{
//Logging.Log(LoggingMode.Error, "You message , EXP:{0}...", exp.ToString());
Response.Redirect("~/ErrorPages/Oops.aspx?Error=WCfOperationFailed", false);
}
in your error page page_load:
switch (Request.QueryString["Error"].ToString())
{
case "WCfOperationFailed":
litError.Text = string.Format("<h2>Error!.</h2><br/><p>{0}.</p>",GetError());
break;
default:
break;
}
public string GetError()
{
Exception lastError = Server.GetLastError();
return lastError.ToString();
}
or you can redirect error message as a QueryString to error page and show it to user in Page_load like:
//in catch block
Response.Redirect("~/ErrorPages/Oops.aspx?Error="+exp.Message, false);
in error page Page_load :
txtError.Text = Request.QueryString["Error"].ToString();
However, you can trap errors that occur anywhere in your application by adding code to the Application_Error handler in the Global.asax file:
void Application_Error(object sender, EventArgs e)
{
Exception exc = Server.GetLastError();
if (exc is HttpUnhandledException)
{
// Pass the error on to the error page.
Server.Transfer("ErrorPage.aspx?Error="+exc.Message, true);
}
}
This link can be helpful there are some examples
Error Handling