實體框架代碼優先映射

Question

我有兩個類，Group類與User類具有多對多的關係（表示用戶所屬的組），然後該組也與用戶具有一對多的關係類（代表一個組的所有者）。

如何映射此？

public class User 
{ 
    public int Id { get; set; } 
    public string Avatar { get; set; } 
    public string Name { get; set; } 
    public string Message { get; set; } 

    public virtual ICollection<Group> OwnedGroups { get; set; } 
    public virtual ICollection<Group> Groups { get; set; } 
} 

public class Group 
{ 
    public int Id { get; set; } 
    public DateTime CreateDate { get; set; } 
    public DateTime ModifyDate { get; set; } 
    public string Name { get; set; } 
    public string Description { get; set; } 
    public bool System { get; set; } 
    public int ViewPolicy { get; set; } 
    public int JoinPolicy { get; set; } 
    public string Avatar { get; set; } 
    public int Order { get; set; } 
    public int GroupType { get; set; } 

    public virtual User Owner { get; set; } 
    public virtual ICollection<User> Members { get; set; } 
} 

tks提前！

Answer 1

我會用流利的API：

public class Context : DbContext 
{ 
    public DbSet<User> Users { get; set; } 
    public DbSet<Group> Groups { get; set; } 

    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 
     base.OnModelCreating(modelBuilder); 

     modelBuilder.Entity<User>() 
        .HasMany(u => u.Groups) 
        .WithMany(g => g.Members); 

     modelBuilder.Entity<User>() 
        .HasMany(u => u.OwnedGroups) 
        .WithRequired(g => g.Owner) 
        .WillCascadeOnDelete(false); 
    } 
} 

這也應該是可能的數據註釋：

public class User 
{ 
    ... 

    [InverseProperty("Owner")] 
    public virtual ICollection<Group> OwnedGroups { get; set; } 
    [InverseProperty("Members")] 
    public virtual ICollection<Group> Groups { get; set; } 
} 

public class Group 
{ 
    ... 

    [InverseProperty("OwnedGroups")] 
    public virtual User Owner { get; set; } 
    [InverseProperty("Groups")] 
    public virtual ICollection<User> Members { get; set; } 
} 

InverseProperty不需要對關係的雙方，但它確實定義清晰。