就我而言，我将一些nuget软件包升级到了net core 2.2，但是我没有安装net core 2.2 sdk，所以我去了net core网站.下载最新的sdk或运行时程序包，然后以管理员身份在CMD中进行了net stop was /y和net start w3svc的操作.问题为我解决了.

In my case, I upgraded some nuget packages to net core 2.2, but I did not have the net core 2.2 sdk installed, so I went to net core website to download the latest sdk or runtime package, and then I did a net stop was /y and then a net start w3svc in the CMD as administrator. Problem solved for me.