Debug.Assert(false) with no debugger attached

Question

I have a C# app which is launched by another C++ exe.

The c# is a debug build.

When using .Net Framework 4.7 the Debug.Assert(false) would always show a dialog giving me a chance to attach a debugger.

Now I'm using .NET 9 and the Debug.Assert(false) no longer shows a dialog. So I don't get a chance to attach a debugger.

What is the best way to to pause my c# app so I can attach a debugger? The options seem to be doing a Sleep or showing a MessageBox OK, Cancel

This is what I have resorted to

#if DEBUG
            MessageBox.Show("Attach debugger", "Title", MessageBoxButton.OK, MessageBoxImage.Information, MessageBoxResult.OK);
#endif

Is there anything better?

Enable mixed-mode debugging. learn.microsoft.com/en-us/visualstudio/debugger/… — Gerry Schmitz
– Gerry Schmitz, Commented Mar 13 at 4:21
Mixed-mode debugging or the api link. This link is the reason Debug.Assert no longer shows a dialog box stackoverflow.com/questions/48413592/…. My question is simple enough - what are the alternatives? — Michael T
– Michael T, Commented Mar 13 at 5:55
Hans already posted a link to one: Call Debugger.Launch() - and one of the answers in the link you posted has a suggestion too. — Matthew Watson
– Matthew Watson, Commented Mar 13 at 9:35

Zhenning Zhang · Accepted Answer · 2025-03-14 06:51:15Z

1

As Hans' comment mentioned, it is feasible to use Debugger.Launch() and Debugger.Break().

Debugger.Launch() Forces the debugger to start if it is not already attached.

Debugger.Break() Triggers a breakpoint if a debugger is already attached.

Here is my code, you can refer to it：

        static void Main()
        {
#if DEBUG
        if (!Debugger.IsAttached)
        {
            Debugger.Launch(); 
        }
        Debugger.Break(); 
#endif
 
            Console.WriteLine("C# running");
            Console.WriteLine("C# running1");
            Console.WriteLine("C# running2");
            Console.WriteLine("C# running3");
            Thread.Sleep(5000); 
        }

answered Mar 14 at 6:51

Zhenning Zhang

4381 silver badge5 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Debug.Assert(false) with no debugger attached

1 Answer 1

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related