Question

我正在开发一个asp.net-core 2.0项目。

此项目包含一个包含Entity Framework Core的数据库。我正在使用迁移的Code First模式。

我想要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。

我在IdentityDbContext类中查看了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类中初始化数据的约定不在modelCreating方法中。使用modelCreating最常用的方法是将实体映射到数据库表，如下面的代码。

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();

在OnModelCreating for EF core

1 个答案: