Getting Exception Details from ASP.NET PageMethods on the Client SIde

Question

I am having a pagemethod to which i give a call from my JavaScript say

Pagemethods.MyMethod(MyParameter, onsucess, onfailure);

In the Code behind, I have something like this:

[WebMethod]
public static void MyMethod(Param)
{
   try{
     //DoSomething..
   }
   catch(exception ex)
   {
      //Log the exception and rethrow
      throw new exception(ex.innerexception);
   }
}

Now the issue i face is :

Whenever i do get an exception, i re throw the exception from code behind

But in the onfailure method, i just get a generic message saying that "the server method MyMethod failed with following error: "

I don't seem to get the exception details and only that generic exception,

How can i get the exception details on JavaScript, in order to handle it according on the UI/JavaScript side.

I have verified, that it is not an issue with custom errors settings in web.config.

Can some one enlighten to me as to what is happening here?

PS: i have stepped through each and every line of code and the exception after being logged is rethrown with the proper exception details i.e. message.

Nkvd

Your exception handling is very bad. After logging the exception, just use throw;. Your code is destroying the stack trace, and losing exception details. – Hildegardhildegarde

Answer 1

As far as I understand as long as you have

<customErrors mode="off" />

in your web.config, the message will be returned to client. Are you sure you have this setting ?

To display the message associated with error you need to have oassed the name of the function as the third parameter of the page method call : this function could be as simple as:

function onfailure( result )
{
   alert( result.get_message() );
}

That's what we have and it works OK

Hurl

Yes i do have custom errors mode "off" But wht i dont get is why do even get that generic message "the server method MyMethod failed with following error: " and only that much nothing in error details. – Nkvd

What code do you have in your javascript onfailure function ? Do you use get_message to extract the 'message' ? – Hurl

this is how my onfailure method looks like function onCallFailure(ex, userContext, methodName){ alert(ex.get_message());} This is where i see that generic error message i said i get – Nkvd

my app does have a master page this master page has the script manager with page methods enabled. In one of the pages which use the above mentioned master page, there is a page method call to MyMethod. – Nkvd

what gets returned from get_statusCode() and get_exceptionType() ? – Hurl

get_statusCode() returns 500 get_exceptionType returns empty string get_message() returns the generic message i am saying – Nkvd

Were you ever able to figure this out? I have the same issue and customerrors mode set to off doesn't help. – Deuno

Answer 2

After you have set <customErrors mode="off" /> in the <system.web> section of the web.config, try these functions to get all of the exception details from the PageMethod's onfailure:

function onfailure(error) {                
    alert("Error: " + error.get_message() + "; " + 
        "Stack Trace: " + error.get_stackTrace() + "; " + 
        "Status Code: " + error.get_statusCode() + "; " + 
        "Exception Type: " + error.get_exceptionType() + "; " + 
        "Timed Out: " + error.get_timedOut());
}

I've found the error's status code to be far more helpful than the error message itself.

Steffaniesteffen