当实体使用复合键时,实体框架5可以多对多

Question

当我想首先使用代码映射多对多关系时,我对EF 5有一些问题.这是我的情景:

public class SegFunction
{
    public virtual string Idaplication {get;set;}

    public virtual string Idfunction {get;set;}

    public virtual List<SegRole> Roles { get; set; }

}

public class SegRole
{
    public virtual int Idrole { get; set; }

    public virtual List<SegFunction> Functions { get; set; }

}

这是我的地图:

private void MapSegRole()
    {
        this.modelBuilder.Entity<SegRole>()
        .Map(entity =>
        {
            entity.ToTable("seg_roles");
        });
        this.modelBuilder.Entity<SegRole>()
            .Property(t => t.Idrole).HasColumnName("id_role");
        this.modelBuilder.Entity<SegRole>()
             .HasKey(c => c.Idrole);


        modelBuilder.Entity<SegRol>()
       .HasMany(i => i.Functions)
       .WithMany(c => c.Roles)
       .Map(
        m =>
        {
            mc.ToTable("seg_role_function");
            m.MapRightKey("id_role");
            m.MapLeftKey("id_aplication");
            m.MapLeftKey("id_function");
        });
    }

和

private void MapSegFunction()
    {

        this.modelBuilder.Entity<Segfunction>()
        .Map(entity =>
        {
            entity.ToTable("seg_functions");
        });
        this.modelBuilder.Entity<Segfunction>()
            .Property(t => t.Idfunction).HasColumnName("id_function");
        this.modelBuilder.Entity<Segfunction>()
            .Property(t => t.Idaplication).HasColumnName("id_aplication");
        this.modelBuilder.Entity<Segfuncion>()
            .HasKey( d => new { d.Idaplication, d.Idfunction});

        this.modelBuilder.Entity<Segfunction>()
           .HasMany(t => t.Roles)
           .WithMany(r => r.Functions)
            .Map(mc =>
            {
                mc.ToTable("seg_role_function");
                mc.MapLeftKey("id_role");
                mc.MapRightKey("id_aplication");
                mc.MapRightKey("id_function");
            });





    }

我有三个表Seg_Role,Seg_Function,Seg_role_function其中seg_function有复合主键(id_aplication,id_function)和seg_role_function有一个复合键(id_role,id_aplication,id_function)

当我尝试从上下文中获取时,我收到以下错误:

指定的关联外键列'id_role'无效.指定的列数必须与主键列的数量匹配.

Answer 1

MapLeftKey并且MapRightKey有一个params string[] keyColumnNames参数,因此对于复合键,您可以将多个参数传递给这些方法,而不是将它们调用两次:

modelBuilder.Entity<SegRol>()
   .HasMany(i => i.Functions)
   .WithMany(c => c.Roles)
   .Map(m =>
    {
        mc.ToTable("seg_role_function");
        m.MapLeftKey("id_role");
        m.MapRightKey("id_aplication", "id_function");
    });