Topic: Exception Class

[shers]

Hi,

I have an Exception Class as below.

Code: [Select]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Test
{
    class MyException : Exception
    {
    }
}
I call this class as below

Code: [Select]

if (result == false)
            {
                throw new MyException();
            }
But I get an error that says 'Unhandled exception has occured in a component in your application. If you click Continue, the application will ignore this error and attempt to continue.

Exception of type Test.MyException was thrown.

Please help.

Thanks

[Kerry]

I believe you'll need to add constructors to the class

eg
https://msdn.microsoft.com/en-us/library/87cdya3t(v=vs.110).aspx

[Kerry]

I call this class as below

Code: [Select]

if (result == false)
            {
                throw new MyException();
            }

every time you do that Zod kills a little kitten.

perhaps try something like :

Code: [Select]

if (!result)
            {
                throw new MyException();
            }

[shers]

I believe you'll need to add constructors to the class

eg
https://msdn.microsoft.com/en-us/library/87cdya3t(v=vs.110).aspx

That doesn't make any difference.

[Keith Brown]

You need to catch the exception once you throw it.

[shers]

It was a way to exit the application from the class. Any other option?

[Keith Brown]

You need to handle all exceptions.  Otherwise you will get an unhandled exception error.

Catch it in your calling method.

[shers]

try
            {
                if (!result)
                {
                    throw new MyException();
                }
            }
            catch (Exception ex)
            {
                throw;
            }

Still the same. I don't want the execution to continue when throw new MyException is reached. That is, the execution should stop. Is there any other method.

[MexicanCustard]

try
            {
                if (!result)
                {
                    throw new MyException();
                }
            }
            catch (Exception ex)
            {
                throw;
            }

Still the same. I don't want the execution to continue when throw new MyException is reached. That is, the execution should stop. Is there any other method.

You're just re-throwing the exception within the catch.  Whats catching your exception above this?  If you keep throwing the exception it will bubble up to the operating system and you get the error dialog you posted.  If you put a breakpoint within your catch clause you should be hitting it.

[shers]

Exception of type 'Test.MyException' was thrown. This is the error I get in the catch block

[gile]

Hi,

What's the issue ?
You throw an exception and the host application (AutoCAD here) alerts you an exception occured. This is the way all exception work.

[Kerry]

Oh, wait !

You don't really want an exception thrown ; You want to return to main and exit if the test returns true ?? Yes ?

[shers]

Exactly! I call a wpf window with an OK and Cancel button, from a class. When the user clicks on the Cancel button, the code should exit. Instead, it continues to execute. To avoid this, I call this MyException class, so that it simple exits. Is there any other way to quit the application if the user clicks on the Cancel button?

Thanks

[Kerry]

Yes, just close the wpf and return to main.

[MexicanCustard]

Exactly! I call a wpf window with an OK and Cancel button, from a class. When the user clicks on the Cancel button, the code should exit. Instead, it continues to execute. To avoid this, I call this MyException class, so that it simple exits. Is there any other way to quit the application if the user clicks on the Cancel button?

Thanks

Set the IsCancel property on your cancel Button to true that will handle the cancel button.  Unless you need to do some cleanup within the window, which you shouldn't be doing.

For the Ok button set the windows DialogResult property to true that takes care of that button.