Get full error message in NullReferenceException

Question

In the image below you can see that running the application in debug mode I get the actual variable that was null which caused the error (circled).

In the catch of this, I looked thru the entire structure of Exception object and did not find the same information.

Does anyone have any suggestions on how to get this same information when not in debug mode?

Thanks!

Answer 1

The NullReferenceException error is easy to implement. Often it is because the object is not initialized. But there are many other reasons too.

You can check the following examples, or refer to this link:What is a NullReferenceException, and how do I fix it?.

using System;

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            try
            {
                object o = null;
                int d = (int)o;
                Console.WriteLine(d);
            }
            catch (NullReferenceException ex)
            {
                Console.WriteLine("ex.Message:" + ex.Message);
                Console.WriteLine("ex.StackTrace:" + ex.StackTrace);
                Console.ReadLine();
            }
        }
    }
}

Uncheck "Break when...", and you can get the information directly in the catch (if you want to check it again, you can add a breakpoint to the error line, etc.).

Eliminating this error basically requires checking that the error object is initialized or not null.