How get a breakpoint on variable write in Visual Studio?

Question

How I can set breakpoint on variable change (I think this is write access) in Visual Studio?

Answer 1

This is referred to as a Data Breakpoint in Visual Studio. To create one you'll need the address of the variable in question (just add &variableName) to the watch or immediate window. Then do the following

1. Debug -> New Breakpoint -> New Data Breakpoint
2. Enter the address in and size of the value in bytes

Note: This is only supported for C++ applications. Managed languages don't support data break points.

Answer 2

You need to add "Has Changed" condition to your breakpoint. To do this:

1. Set breakpoint on the line you want it to break when your variable is changed.
2. Right-click red dot icon, select "Condition".
3. Enter your variable name and select "Has Changed" option.

You may find more information in this MSDN how-to.