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(..)
.
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.
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).
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