前提：

1. 在没有程序员进行指导的情况下，实施可以快速进行项目部署；
2. 无需执行数据库脚本，程序员告别繁琐的数据库建表操作，以及默认数据的配置；

Step1：项目引用添加 Microsoft.EntityFrameworkCore

Step2：

  在Startup.cs文件中的ConfigureServices方法内添加代码

services.AddDbContext<CoreDbContext>(options => options.UseSqlServer("你的数据库链接字符串"));

Step3：

  新建文件DbContextSeed.cs

using Microsoft.EntityFrameworkCore;
using RunGo.Core.Expand;
using RunGo.Core.Managing;
using System;
using System.Linq;
using System.Threading.Tasks;
using UtilHelp;

namespace RunGo.Core.Web.Host.Startup.Initialize
{

    namespace mvcforcookie.Data
    {
        public class DbContextSeed
        {
            private string badStr = "初始化数据库失败";
            private string okStr = "初始化数据库成功";
            public async Task SeedAsync(DbContext context, IServiceProvider service)
            {
                if (context.Set<Tenants>().Count() == 0)
                {
                    //创建初始租户
                    var defultTenant = new Tenants()
                    {
                        Name = DefaultSet.DefaultName,
                        TenancyName = DefaultSet.DefaultCName,
                        PassWord = EncryptionHelp.MD5Encrypt64("123456", DefaultSet.DefaultName),
                        Id = DefaultSet.DefaultId
                    };
                    try {
                        await context.AddAsync(defultTenant);
                        var result = await context.SaveChangesAsync();
                        if (result == 0)
                            Console.WriteLine(badStr);
                        else
                            Console.WriteLine(okStr);
                    }
                    catch (Exception e)
                    {
                        Console.WriteLine(badStr);
                    }

                }
            }
        }
    }
}

新建文件 InitializeTheDBExtensions.cs

using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using System;

namespace RunGo.Core.Web.Host.Startup.Initialize
{
    public static class InitializeTheDBExtensions
    {
        /// <summary>
        /// 初始化数据库
        /// </summary>
        /// <param name="host"></param>
        /// <param name="sedder"></param>
        /// <returns></returns>
        public static IWebHost InitializeDbContext<TContext>(this IWebHost host, Action<TContext, IServiceProvider> sedder)
            where TContext : DbContext
        {
            using (var scope = host.Services.CreateScope())
            {
                var services = scope.ServiceProvider;
                var context = services.GetService<TContext>();
                try
                {
                    context.Database.Migrate();
                    sedder(context, services);
                }
                catch (Exception ex)
                {
                    Console.WriteLine("初始化失败");
                }
            }
            return host;
        }
    }
}

Step4：在Main方法里调用初始化方法

public static void Main(string[] args) {
             BuildWebHost(args)
               .InitializeDbContext<CoreDbContext>((context, services) =>
               { new DbContextSeed().SeedAsync(context, services).Wait(); })
             .Run();
        }

Step5：执行项目即可看到成果了。