VS2019最新版本中整数及List.Count显示异常问题求助

Hey there! I’ve definitely seen other developers hit this exact same issue after updating to the latest VS2019 release—total pain when everything was running smoothly before the update, and props to you for putting in 90 minutes of troubleshooting already.

Here are some common fixes that have worked for others in your situation:

• Clear the Visual Studio Component Cache: Corrupted cache files post-update often cause weird debugger display glitches. Close all VS instances, delete everything in %LocalAppData%\Microsoft\VisualStudio\<your_VS2019_version>\ComponentModelCache, then restart VS and rebuild your project.
• Verify Runtime Values vs. Debugger Display: Sometimes the debugger is just lying to you! Log the integer values and List.Count to the console with Console.WriteLine()—if the console shows the correct numbers, the issue is only with the debugger’s visualizer, not your actual code.
• Check Project Settings: Updates can occasionally reset project properties. Double-check that your target framework is still the one you were using before, and make sure "Optimize code" is disabled in Debug mode (it can mess with debugger accuracy).
• Test in Safe Mode: Third-party extensions are frequent troublemakers after IDE updates. Launch VS with devenv /safemode—if the issue disappears, disable your extensions one by one to find the conflicting one.
• Repair VS Installation: If all else fails, run a repair through the Visual Studio Installer. Sometimes updates leave corrupted files behind that a repair can fix.

Hope one of these gets you sorted out quickly!

内容的提问来源于stack exchange，提问作者newbiedotnet