Breakpoint not hit in managed code

Question

I have inherited an application consisting of a number of C#, C++/CLI and native C++ projects.

The app starts as an MFC application but loads the CLR during startup (via a process I'm not sure I fully understand yet^†).

I've found that I can place breakpoints in native C++ code and that these work as expected. However, breakpoints in managed code do not work.

In C# I get:

"The breakpoint will not currently be hit. No symbols have been loaded for this document".

In C++/CLI I Get:

"The breakpoint will not currently be hit. No executable code is associated with this line. Possible causes include: preprocessor directives or compiler/linker optimizations".

I can even set two breakpoints in the same C++ file and have only one work, e.g.

#pragma unmanaged

int CMyClass::UnmanagedFunc()
{
    // Breakpoint here works
    return 1
}

#pragma managed

int CMyClass::ManagedFunc()
{
    // Breakpoint here DOES NOT WORK!!
    return 2
}

The project settings for "Enable unmanaged code debugging" (within the managed library projects) has no effect on these breakpoints. Is there some setting or config or something that I do do to allow me to interrupt and step through the managed parts of the code base?

^†: The process loads mscoree.dll, and involves a complicated routine including CLRCreateInstance, ICLRMetaHost, ICLRRuntimeHost, GetRuntime(..), Start() and ExecuteInDefaultAppDomain(..).

Hans Passant · Accepted Answer · 2015-07-08T10:38:34.387

12

Since your main EXE is a native program, it is likely that the debugger starts up in unmanaged mode and will therefore not support setting breakpoints on managed code. Project + Properties, Debugging, Debugger Type setting. Change it from the default of Auto to Mixed or Managed Only. Mixed debugging only works in 32-bit mode.

UPDATE: starting with VS2012 you also have to force the debugger to use the legacy managed code debugging engine, the one that still supports C++/CLI. Tools > Options > Debugging > General > "Use managed compatibility mode" setting.

edited Jul 08 '15 at 10:38

answered Nov 12 '12 at 18:12

Hans Passant

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D'oh. I knew it'd be something simple I was overlooking. Changing this from "Auto" to "Mixed" has done the trick..... – Grhm Nov 13 '12 at 08:52
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Combining this answer with tools->Options->Debugging->General turn 'Use managed compatibility mode' solved the issue for me. Tnx! – NP83 Mar 18 '14 at 11:21

score 2 · Answer 2 · answered Jul 04 '19 at 20:45

2

For me, the key was to change debugger type from Auto to Mixed, but for the startup application, not the library which contained the C++/CLI code (which is what I was trying to do).

answered Jul 04 '19 at 20:45

Dženan

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score 0 · Answer 3 · edited Apr 07 '17 at 18:45

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For the same error it works with me when I specified debugger type to:

"Native Only" or "Managed Only" not to Mixed or Auto!!!

edited Apr 07 '17 at 18:45

Petter Friberg

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answered Apr 07 '17 at 11:19

H. Ali

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score 0 · Answer 4 · answered Sep 05 '22 at 07:56

0

For me it was in project properties -> Linker -> Debugging -> Debuggable Assembly set to YES (/ASSEMBLYDEBUG)

answered Sep 05 '22 at 07:56

Myfero

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Breakpoint not hit in managed code

4 Answers4