离线安装vs2019安装包
cmd
1.vs_Community.exe --layout E:\Vs2019\back --add Microsoft.VisualStudio.Workload.NetWeb --includeOptional --lang zh-cn 2.vs_setup.exe --layout E:\Vs2019\back --add Microsoft.VisualStudio.Workload.NetWeb --includeOptional --lang zh-cn