EF Core在单独的类库中进行迁移

EF Core在单独的类库中进行迁移

AppDbContext类放在DAL层，则需要在DAL层创建DbContextDesignTimeFactory.cs

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using Microsoft.EntityFrameworkCore.Design; using Microsoft.EntityFrameworkCore; using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using Microsoft.Extensions.Configuration;   namespace Niunan.Demo.DAL {     internal class DbContextDesignTimeFactory : IDesignTimeDbContextFactory<AppDbContext>     {         /// <summary>         /// nuget:         /// Microsoft.EntityFrameworkCore, Microsoft.EntityFrameworkCore.SqlServer         /// Microsoft.EntityFrameworkCore.Tools,Microsoft.EntityFrameworkCore.Design         /// 程序包管理器控制台(在DAL层运行如下命令)：         /// add-migration init         /// update-database         /// </summary>         /// <param name="args"></param>         /// <returns></returns>         public AppDbContext CreateDbContext(string[] args)         {                 var builder = new DbContextOptionsBuilder<AppDbContext>();                 builder.UseSqlServer("server=.\\sqlexpress;uid=sa;pwd=123456;database=NiunanDemo;TrustServerCertificate=true;");                 return new AppDbContext(builder.Options);                      }     } }