种子数据.net核心

Question

我正在尝试使用数据在.net核心中播放数据库。 首先，我正确地为管理员用户提供用户，用户角色和角色。 由于项目的要求，我做了两个模型讲师，学生 我也用另一个脚本播种这些表格。 我希望每位教师和学生都能看到用户表（Iwant单独表格授权） 我编写以下脚本在program.cs文件中最后运行

 using Microsoft.AspNetCore.Identity;
 using Microsoft.Extensions.Configuration;
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 using WebApplication.Models;

 namespace WebApplication.Data
 {
    public static class AssingUsers
    {
    public static void Initialize(IConfiguration Configuration, ApplicationDbContext context, UserManager<ApplicationUser> UserManage)
    {
        AddUser(Configuration, context, UserManage);
        AddUserRoles(Configuration, context, UserManage);
    }

    private static async void AddUser(IConfiguration Configuration, ApplicationDbContext DBContext, UserManager<ApplicationUser> UserManager)
    {
        if (DBContext.Instructors.Any())
        {
            foreach (Instructor instructor in DBContext.Instructors)
            {
                var User = new ApplicationUser
                {
                    UserName = instructor.Email,
                    Email = instructor.Email,
                    EmailConfirmed = true
                };
                await UserManager.CreateAsync(User, Configuration["Password"]);
            }
        }

        if (DBContext.Students.Any())
        {
            foreach (Student student in DBContext.Students)
            {
                var User = new ApplicationUser
                {
                    UserName = student.Email,
                    Email = student.Email,
                    EmailConfirmed = true
                };
                await UserManager.CreateAsync(User, Configuration["Password"]);
            }
        }
    }

    private static void AddUserRoles(IConfiguration Configuration, ApplicationDbContext DBContext, UserManager<ApplicationUser> UserManager)
    {
        if (DBContext.Students.Any())
        {
            foreach (Student st in DBContext.Students)
            {
                var UserRole = new IdentityUserRole<string>
                {
                    UserId = DBContext.Users.Single(r => r.Email == st.Email).Id,
                    RoleId = DBContext.Roles.Single(r => r.Name == "User").Id
                };
                DBContext.UserRoles.Add(UserRole);
            }
            DBContext.SaveChanges();
        }

        if (DBContext.Instructors.Any())
        {
            foreach (Instructor ins in DBContext.Instructors)
            {
                var UserRole = new IdentityUserRole<string>
                {
                    UserId = DBContext.Users.Single(x => x.Email == ins.Email).Id,
                    RoleId = DBContext.Roles.Single(x => x.Name == "Manager").Id
                };
                DBContext.UserRoles.Add(UserRole);
            }
            DBContext.SaveChanges();
        }
    }
}
   }

虽然一切都很完美，但我在教师和学生桌上播种时遇到了问题。 我尝试通过_context.Users.Add（）进行同步，但同样没有。 有什么建议吗？