1.安装NuGet程序包
Microsoft.EntityFrameworkCore.Tools Microsoft.EntityFrameworkCore.SqlServer
2.配置Program，注入 AddDbContext 单例模式
builder.Services.AddDbContext<AppDbContext>(options => options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection"), x => x.MigrationsAssembly("Micro.Crm")));
3.使用程序包管理器控制台命令
Add-Migration InitialCreate Update-Database