"Cannot evaluate expression because the code of the current method is optimized" in Visual Studio 2010

Question

While the project was in debug mode, the solution was not. When I changed it, it worked.

I had this issue when I was using VS 2010. My solution configuration has (Debug) selected. I resolved this by unchecking the Optimize Code property under project properties. Project (right Click)=> Properties => Build (tab) => uncheck Optimize code

It sounds like you are debugging an optimised / release build, despite having the optimised box un-checked. Things you can try are:

• Do a complete rebuild of your solution file (right click on the solution and select Rebuild all)
• While debugging open up the modules window (Debug -> Windows -> Modules) and find your assembly in the list of loaded modules. Check that the Path listed against your loaded assembly is what you expect it to be, and that the modified timestamp of the file indicates that the assembly was actually rebuilt.
• The modules window should also tell you whether or not the loaded module is optimised or not - make sure that the modules window indicates that it is not optimised.

If you cant't see the Modules menu item in the Debug -> Windows menu then you may need to add it in the "Customise..." menu.

For me it was happening in VS2017 and VS2019. It stopped happening after I selected the option "Suppressed JIT optimization on module load".

In VS2013 go to: Tools -> Options -> Debugging -> General and enable 'Use managed compatibility mode'. This disables the new function evaluation behavior.

Try to run in debug mode.If you are running in release mode you will get this message.

My situation was not covered by any of the above answers. I found the following: MSDN article on threading that explains that when stuck in some primitive native threading operations, the debugger can't access the data. As an example, when a thread is sitting on Task.Wait(), this comes up.