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Asked: 2026-05-10T15:15:35+00:00

I have a wrapper around a C++ function call which I call from C#

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I have a wrapper around a C++ function call which I call from C# code. How do I attach a debugger in Visual Studio to step into the native C++ code?

This is the wrapper that I have which calls GetData() defined in a C++ file:

    [DllImport('Unmanaged.dll', CallingConvention=CallingConvention.Cdecl,                 EntryPoint = 'GetData', BestFitMapping = false)]         public static extern String GetData(String url);

The code is crashing and I want to investigate the root cause.

Thanks, Nikhil

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1 Answer

  1. Check the Debug tab on your project’s properties page. There should be an ‘Enable unmanaged code debugging’ checkbox. This worked for me when we developed a new .NET UI for our old c++ DLLs.

    If your unmanaged DLL is being built from another project (for a while ours were being built using VS6) just make sure you have the DLL’s pdb file handy for the debugging.

    The other approach is to use the C# exe as the target exe to run from the DLL project, you can then debug your DLL normally.

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