Model view controller 如何设置“授权属性”角色和权限

我的自定义表格：

public class UserController : Controller
{
[MyAuthorization(Roles="ADMIN", Permissions="USER_ADD")]
public ActionResult Add()

[MyAuthorization(Roles="ADMIN", Permissions="USER_EDIT")]
public ActionResult Edit()

[MyAuthorization(Roles="ADMIN", Permissions="USER_DELETE")]
public ActionResult Delete()
}

如何设置“授权属性”角色和权限

[ Permission { ID, Name } ] // Get_User, Delete_User vb.vb.

[ User_Permission { ID, UserID, RoleID, PermissionID } ]  // 1 - John - Admin - Get_User

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AuthorizeCore Method in AuthorizeAttribute Class is override...

    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
    if(user has any permission of Permissions)
        return true;  //  **I'm stuck in this section**
    }