SQL Server 用户权限管理，LINQ去除它的重复菜单项

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代码如下:

 
class Program 
{ 
static void Main(string[] args) 
{ 
#region 实体列表初始化 
List<User_Role> userRole = new List<User_Role> 
{ 
new User_Role("01",1), 
new User_Role("01",2), 
new User_Role("02",1), 
}; 
List<Role_Menu> roleMenu = new List<Role_Menu> 
{ 
new Role_Menu(2,3), 
new Role_Menu(1,1), 
new Role_Menu(1,2), 
new Role_Menu(2,1), 
new Role_Menu(2,2), 
}; 
List<Menu> menu = new List<Menu> 
{ 
new Menu(1,"编辑",2), 
new Menu(2,"文件",1), 
new Menu(3,"视图",3), 
new Menu(4,"系统",4), 
}; 
#endregion 
var linq = from data1 in userRole 
join data2 in roleMenu on data1.RoleId equals data2.RoleId 
join data3 in menu on data2.MenuId equals data3.MenuId 
where data1.UserId.Equals("01") 
select new 
{ 
UserId = data1.UserId, 
MenuId = data2.MenuId, 
Menu = data3, 
}; 
linq.Distinct().OrderBy(i => i.Menu.OrderNumber).ToList() 
.ForEach(i => Console.WriteLine("用户ID：{0},菜单ID{1},菜单名：{2}" 
, i.UserId, i.MenuId, i.Menu.MenuName)); 
Console.ReadKey(); 
} 
} 
#region 实体对象 
class User_Role 
{ 
public string UserId { get; set; } 
public int RoleId { get; set; } 
public User_Role(string userId, int roleId) 
{ 
this.RoleId = roleId; 
this.UserId = userId; 
} 
} 
class Menu 
{ 
public int MenuId { get; set; } 
public string MenuName { get; set; } 
public int OrderNumber { get; set; } 
public Menu(int menuId, string menuName, int orderNumber) 
{ 
this.MenuId = menuId; 
this.MenuName = menuName; 
this.OrderNumber = orderNumber; 
} 
} 
class Role_Menu 
{ 
public int RoleId { get; set; } 
public int MenuId { get; set; } 
public Role_Menu(int roleId, int menuId) 
{ 
this.RoleId = roleId; 
this.MenuId = menuId; 
} 
} 
#endregion 

这样的结果是我希望看到的：

【图片暂缺】

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