安装.NET SDK
要开始构建.NET应用程序，需下载并安装.NET SDK（软件开发工具包），我用的操作系统为Ubuntu 18.04 LTS
在terminal执行命令
wget -q https://packages.microsoft.com/config/ubuntu/18.04/packages-microsoft-prod.deb
sudo dpkg -i packages-microsoft-prod.deb安装.NET SDK
sudo add-apt-repository universe
sudo apt-get install apt-transport-https
sudo apt-get update
sudo apt-get install dotnet-sdk-2.2如果收到类似的错误消息Unable to locate package dotnet-sdk-2.2，请运行以下命令
sudo dpkg --purge packages-microsoft-prod && sudo dpkg -i packages-microsoft-prod.deb
sudo apt-get update
sudo apt-get install dotnet-sdk-2.2如果这不起作用，您可以使用以下命令运行手动安装
sudo apt-get install -y gpg
wget -qO- https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.asc.gpg
sudo mv microsoft.asc.gpg /etc/apt/trusted.gpg.d/
wget -q https://packages.microsoft.com/config/ubuntu/18.04/prod.list
sudo mv prod.list /etc/apt/sources.list.d/microsoft-prod.list
sudo chown root:root /etc/apt/trusted.gpg.d/microsoft.asc.gpg
sudo chown root:root /etc/apt/sources.list.d/microsoft-prod.list
sudo apt-get install -y apt-transport-https
sudo apt-get update
sudo apt-get install dotnet-sdk-2.2检查是否安装正确
dotnet创建第一个C#程序：
在terminal分别执行如下命令：
dotnet new console -o myApp
cd myApp
dotnet run