1.连接网络
虚拟机连接不上网络，不是设置的问题，很有可能你没有打开连接。CentOS右上角的有线连接，打开就好了。这年头，没有网络能干啥啊！！！
2.打开下面这个连接在CentOS 7安装.net core
https://docs.microsoft.com/zh-cn/dotnet/core/install/linux-package-manager-centos7
3.打开下面这个连接
https://dotnet.microsoft.com/learn/aspnet/hello-world-tutorial/install
按照上面的链接执行完命令后，进入Get a editor
4.选择一个editor
https://dotnet.microsoft.com/platform/tools
5.选择Visual Studio Code
6.进入C# extension
https://marketplace.visualstudio.com/items?itemName=ms-dotnettools.csharp
7.学习document
https://code.visualstudio.com/docs/languages/csharp
8.vs code开发视频
https://channel9.msdn.com/Blogs/dotnet/Get-started-VSCode-Csharp-NET-Core-Windows
9.CentOS安装VS Code
https://www.linuxidc.com/Linux/2020-03/162623.htm
10.Nano如何保存
https://zhidao.baidu.com/question/1862645972058083507.html