1。关闭Visual Studio的所有实例

2.卸载NuGet

3.重新打开Visual Studio

4.导航到=>工具= >扩展和更新

5.搜索NuGet，然后重新安装以获取最新版本

1. Close all instances of Visual Studio
2. Uninstall NuGet
3. Re-open Visual Studio
4. Navigate to =>Tools =>Extensions and Updates
5. Search for NuGet, and reinstall to get latest version