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

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);
           
        }
    }
}