我在此站点中看到了类似的问题，但是该解决方案对我不起作用。我在笔记本电脑（Windows 7）中下载了.NET SDK 2.2.10安装程序，安装成功后，每当我尝试在cmd上执行与.NET相关的任何命令时，它都会显示以下错误：
C:\Users\USER>dotnet --help
Failed to load the DLL from [C:\Program Files\dotnet\host\fxr\2.2.0\hostfxr.dll]
, HRESULT: 0x80070057
The library hostfxr.dll was found, but loading it from C:\Program Files\dotnet\h
ost\fxr\2.2.0\hostfxr.dll failed
- Installing .NET Core prerequisites might help resolve this problem.
http://go.microsoft.com/fwlink/?LinkID=798306&clcid=0x409
C:\Users\USER>
当我只键入dotnet时，它显示以下说明：
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\USER>dotnet
Usage: dotnet [options]
Usage: dotnet [path-to-application]
Options:
-h|--help Display help.
--info Display .NET Core information.
--list-sdks Display the installed SDKs.
--list-runtimes Display the installed runtimes.
path-to-application:
The path to an application .dll file to execute.
为什么此DLL无法正确加载？ 解决此问题后，如何从命令行编译c＃程序？ 预先谢谢你。