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sqlserver 用户权限管理,LINQ去除它的重复菜单项

Jun 07, 2016 pm 06:02 PM
sqlserver User rights management

事情是这样的,我有三张表,用户_角色关系表User_Role,角色_菜单关系表Role_Menu和菜单表

Menu,这三个表之间有如下关系:
User_Role=>RoleId=>RoleMenu
RoleMenu=>MenuId=>Menu
它们之间的业务关系是:
当用户登陆后,通过UserId得到User_Role列表,将用户所包括的角色得出
通过User_Role找到所有对应Menu
现在有个问题,就是一个用户可以有多少角色,一个角色有多个菜单,当然,两个不同的角色可以有相当的菜单项,这时,就出现一个问题,用户在“管理员”这个角色里有“文件”这个菜单,同时它在“新闻管理员”这个角色里也有“文件”这个菜单,这样返回就会出现两个完成相同的”文件“菜单,下面,我使用匿名类和distinct方法来解决这个问题,代码如下:
代码如下:
class Program
{
static void Main(string[] args)
{
#region 实体列表初始化
List userRole = new List
{
new User_Role("01",1),
new User_Role("01",2),
new User_Role("02",1),
};
List roleMenu = new List
{
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 = new List
{
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:

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