ef core db first EFCore数据库优先

1.引入NuGet包

Microsoft.EntityFrameworkCore.SqlServer//SqlServer
Microsoft.EntityFrameworkCore.Tools//工具

2.在程序包管理器控制平台上输入

Scaffold-DbContext "Data Source=.;Initial Catalog=Test_DB;Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Model -Context TestDBContext
//或
Scaffold-DbContext "Data Source=.;Initial Catalog=blos_DB;Persist Security Info=True;User ID=sa;Password=***********" Microsoft.EntityFrameworkCore.SqlServer -OutputDir Model -Context TestDBContext
//Scaffold-DbContext "Data Source=[服务器名];Initial Catalog=[数据库名];Integrated Security=True" Microsoft.EntityFrameworkCore.SqlServer -OutputDir [实体在项目中的文件夹名] -Context [Context类名，以Context结尾]