Debugging

[RobertHF]

I also have the same question as the previous one. If developing a C# app and C++/WinRT component together, it makes things very difficult if you can't debug into the component. Are there any guidelines on how to debug?

[RKS (rksharma-owg)]

Yes, you can debug straight into the C++ component. The author of #1525 later confirmed that enabling mixed-mode debugging fixed it.

In the C# startup project, open Properties → Debug → Open debug launch profiles UI, then enable native code debugging for the profile you're running. The wording varies a bit between Visual Studio versions; Microsoft's walkthrough shows the setting.

If your C++ breakpoints still stay hollow:

1. Run far enough for the app to create/use the component, then pause.
2. Open Debug → Windows → Modules and look for the native component DLL.
3. Check its loaded path and Symbol Status. Right-click → Load Symbols to select its PDB, or Symbol Load Information to see why loading failed.

The PDB needs to come from the exact build of the DLL the app actually loaded. If you're consuming the component through a NuGet package, rebuilding the C++ project alone can leave the app using an older packaged DLL with a newer, mismatched PDB.

The Modules window docs cover those checks.