Visual Studio breakpoint debugging, unable to monitor variables, prompt that expressions cannot be calculated, Visual Studio

Visual Studio breakpoint debugging, unable to monitor variables, prompt that expressions cannot be calculated, Visual Studio

When you use Visual Studio 2012 for breakpoint debugging, when you add monitoring to a variable, a message "expressions cannot be calculated" appears.

Solution: click "debug" → "Graph" → "Start diagnosis" in the menu bar"

The following page appears:

After the public symbol is downloaded, the breakpoint debugging and variable monitoring function resume to normal!