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当我想首先使用代码映射多对多关系时,我遇到了 EF 5 的一些问题。这是我的场景:

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");
        });
    }

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 具有复合主键(id_aplication、id_function),而 seg_role_function 具有复合键(id_role、id_aplication、id_function)

当我尝试从上下文中获取时出现以下错误:

指定的关联外键列“id_role”无效。指定的列数必须与主键列数匹配。

4

1 回答 1

8

MapLeftKey并且MapRightKey有一个params string[] keyColumnNames参数,因此对于复合键,您将多个参数传递给这些方法,而不是调用它们两次:

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");
    });
于 2013-06-14T00:26:11.407 回答