安装.NET CORE 3.1

1、注册 Microsoft 密钥和源

sudo rpm -Uvh https://packages.microsoft.com/config/centos/7/packages-microsoft-prod.rpm

2、安装 .NET Core SDK

sudo yum install dotnet-sdk-3.1

3、安装 ASP.NET Core 运行时

sudo yum install aspnetcore-runtime-3.1

4、测试.NET SDK安装成功：

dotnet --version

------------------------------------------------------------- 如果安装失败，则根据报错信息重新安装运行时，或sdk -------------------------------------------------------------