I’ve been having some trouble debugging in Visual Studio 2015. I’m getting the following messages in the Watch window when trying to evaluate a variable for example:
- Condition for breakpoint cannot be evaluated
- Internal error in the expression evaluator
According to the Microsoft employee who replied in this post on Stackoverflow this seems to be a bug in the evaluator and to fix this do the following:
- Go to Tools => Options
- Select “Debugging” section in left panel
There are two solutions to this problem:
- Either check “Use Managed Compatibility Mode” in “General” tab
- Or check “Use the legacy C# and VB expression evaluators” in “General” tab so you can use Edit and Continue as well as other features added within the last few releases.
FitGeekGirl 