与 ASP.NET AspNetUser 表的多对多关系被忽略

Question

一个用户可以是多个项目的成员，而一个项目可以有多个成员。

ASP.NET 身份ApplicationUser

public class ApplicationUser : IdentityUser
{
    [Display(Name = "Projekt")]
    public virtual ICollection<Project> Projects { get; set; }

    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        return userIdentity;
    }
}

我的Project：

[Table("Projects")]
public class Project : IValidatableObject
{
    [Key]
    public int ID { get; set; }
    [Required, StringLength(128), Display(Name = "Projektname"), Index(IsUnique = true)]
    public string Name { get; set; }

    // working one-to-many relation
    [Display(Name = "Projektleiter")]
    public string LeaderID { get; set; }
    [ForeignKey("LeaderID"), Display(Name = "Projektleiter")]
    public virtual ApplicationUser ApplicationUser { get; set; }

    // many-to-many relation gets ignored
    [Display(Name = "Mitarbeiter")]
    public virtual ICollection<ApplicationUser> ApplicationUsers { get; set; }

    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        return new List<ValidationResult>();
    }
}

没有创建多对多表。整个关系被忽略。但是LeaderID的东西正在起作用......

有人可以告诉我我在这里缺少什么吗？ （我用谷歌搜索了它，我多次删除了整个数据库，我尝试了我找到的所有东西，没有运气......）

Answer 1

我会将 ApplicationUser 实体与项目中的任何逻辑分开，并创建另一个名为 Person 的实体。

public class Person
{
//Constuctor : always intantiate lists in ctor
public Person()
{
       Projects = new List<Project>();
}

 public int Id { get; set; }
 public string IdentityId { get; set; } //gets guid from AppUser table
 public ApplicationUser Identity { get; set; }  // navigation property
 public List<Project> Projects { get; set; }
 //public int ProjectId {get; set;}//-----optional

}

所以在项目中知道我们做同样的事情：

[Table("Projects")]
public class Project : IValidatableObject
{
        //Constuctor : always intantiate lists in ctor
    public Project()
    {
           Persons = new List<Person>();
    }
    [Key]
    public int ID { get; set; }
    [Required, StringLength(128), Display(Name = "Projektname"), Index(IsUnique = true)]
    public string Name { get; set; }

    public string PersonId { get; set; }  //nav property
    public List<Persons> Persons { get; set; }
    public Person Person { get; set; } //context will be aware that this is fk

   [Display(Name = "Projektleiter")]
   public string LeaderID { get; set; }




    public IEnumerable<ValidationResult> Validate(ValidationContext validationContext)
    {
        return new List<ValidationResult>();
    }
}

为 dbcontext 类中的两个实体添加数据库集。 现在你想得到一个有项目列表的人，反之亦然。为此，我们使用包含：

var x = myContext.Persons.Include(x => x.Projects);
var d = x.ToList();

//您可以使用 applicationUser 实体代替 person，但随着项目的发展会发生一些不好的事情。