僅在實體框架6中使用外鍵的表（Fluent Api）

Question

如何將兩個不同表中的外鍵映射到流暢Api中的一個表？ 我的兩個模型是一樣具有作爲外鍵上表的主鍵

public class Customer 
{ 
    [Key] 
    public string Userid { get; set; } 

    public string PassWord { get; set; } 

    public bool premium { get; set; } 
} 


public class Roles 
{ 
    [Key] 
    public string Name { get; set; } 

    public string Description { get; set; } 
} 

，三表？

public class CustomerRoles 
{ 
    public string RoleName { get; set; } 
    public string UserId { get; set; } 
} 

如何映射Fluent Api？

Answer 1

public class Customer 
{ 
    [Key] 
    public string Userid { get; set; } 
    public string PassWord { get; set; } 
    public bool premium { get; set; } 
    public ICollection<CustomerRole> CustomerRoles { get; set; } 
} 
public class Role 
{ 
    [Key] 
    public string Name { get; set; } 
    public string Description { get; set; } 
    public ICollection<CustomerRole> CustomerRoles { get; set; } 
} 
public class CustomerRole 
{ 
    public string RoleName { get; set; } 
    public string UserId { get; set; } 
    public Role Role { get; set; } 
    public Customer Customer { get; set; } 
} 
public class AppContext : DbContext 
{ 
    public DbSet<Customer> Customers { get; set; } 
    public DbSet<Role> Roles { get; set; } 
    protected override void OnModelCreating(DbModelBuilder modelBuilder) 
    { 
     base.OnModelCreating(modelBuilder); 

     modelBuilder.Entity<Customer>().HasMany(c => c.CustomerRoles).WithRequired(cr => cr.Customer); 
     modelBuilder.Entity<Role>().HasMany(r => r.CustomerRoles).WithRequired(cr => cr.Role); 
     modelBuilder.Entity<CustomerRole>().HasKey(cr => new { cr.RoleName, cr.UserId }); 
    } 
} 

PS：類名不能是複數，它可能與數組屬性混淆。

更新如何使用它

static void Main(string[] args) 
{ 
    using (var ctx = new AppContext()) 
    { 
     Customer customer = new Customer { Userid = "A" }; 
     ctx.Customers.Add(customer); 

     Role role1 = new Role { Name = "Role1" }; 
     ctx.Roles.Add(role1); 
     Role role2 = new Role { Name = "Role2" }; 
     ctx.Roles.Add(role2); 

     customer.CustomerRoles = new[] 
     { 
      new CustomerRole { Customer = customer, Role = role1 }, 
      new CustomerRole { Customer = customer, Role = role2 }, 
     }; 

     ctx.SaveChanges(); 
    } 
}