asp.net-core - 在 EF 核心的 OnModelCreating 中创建一个用户和角色

Question

我正在做一个 asp.net-core 2.0 项目。

该项目包含一个带有 Entity Framework Core 的数据库。我正在使用带有迁移的 Code First 模式。

我想做的是在我的数据库中创建一些关于结构创建的默认数据。

我需要创建一个用户。

我查看了我的 IdentityDbContext 类中的 OnModelCreating 函数，但我无法访问 userManager 对象。

所以我不知道该怎么做....谢谢

这是我的代码:

    public class MyContext : IdentityDbContext<Utilisateurs>
    {
        public static string ConnectionString;

        public MyContext()
        {

        }

        public MyContext(DbContextOptions<pluginwebContext> options) : base(options)
        {

        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseSqlServer(MyContext.ConnectionString);
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            base.OnModelCreating(modelBuilder);
            var user = new MyUserClass { UserName = "test" };

            // Error There
            var result = await _userManager.CreateAsync(user, "1234");
        }

        public DbSet<MyTable1> table1 { get; set; }
        ...
    }

Answer 1

在 DbInitialize 类中而不是在 modelCreating 方法中初始化数据的约定。使用 modelCreating 最常用的方法是将您的实体映射到数据库表，如以下代码。

protected override void OnModelCreating(ModelBuilder modelBuilder)
{
     modelBuilder.Entity<Course>().ToTable("Course");
     modelBuilder.Entity<Enrollment>().ToTable("Enrollment");
     modelBuilder.Entity<Student>().ToTable("Student");
}

稍后，您可以为虚拟对象创建一个类。

  public static class DbInitializer
    {
        public static void Initialize(SchoolContext context)
        {
            //context.Database.EnsureCreated();

            // Look for any students.
            if (context.Students.Any())
                {
                    return;   // DB has been seeded
                }

        var courses = new Course[]
                    {
                        new Course {CourseID = 1050, Title = "Chemistry",      Credits = 3,
                            DepartmentID = departments.Single( s => s.Name == "Engineering").DepartmentID
                        },
                        new Course {CourseID = 4022, Title = "Microeconomics", Credits = 3,
                            DepartmentID = departments.Single( s => s.Name == "Economics").DepartmentID
                        },
                        new Course {CourseID = 4041, Title = "Macroeconomics", Credits = 3,
                            DepartmentID = departments.Single( s => s.Name == "Economics").DepartmentID
                        },
                        new Course {CourseID = 1045, Title = "Calculus",       Credits = 4,
                            DepartmentID = departments.Single( s => s.Name == "Mathematics").DepartmentID
                        },
                        new Course {CourseID = 2042, Title = "Literature",     Credits = 4,
                            DepartmentID = departments.Single( s => s.Name == "English").DepartmentID
                        },
                    };

                    foreach (Course c in courses)
                    {
                        context.Courses.Add(c);
                    }
                    context.SaveChanges();