问题
I got this error in the browser after updating to .net core release 3.0:
TypeLoadException: Could not load type 'System.Diagnostics.CodeAnalysis.MaybeNullAttribute' from assembly 'netstandard, Version=2.1.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51
I've updated everything to latest version 3.0. Is it a bug? What should i do?
回答1:
This error occurred when using preview SDK of .NET Core. Based on this git thread:
Make sure all .net core runtimes and SDKs are uninstalled. Run dotnet --info to see. If installing 3.0.100 didnt remove the previews, go to those dirs and manually remove them. Re install (modify) the net core 3.0.100 installation to be safe again.
Make sure you have installed VS 2019 16.3.1
来源：https://stackoverflow.com/questions/58242652/exception-after-updating-from-preview-to-net-core-3-0-release