asp.net怎么实现角色权限控制

/// <summary>
/// AdminPermission角色权限验证类
/// </summary>
public class AdminPermission : System.Web.UI.Page
{
Hope.BLL.Hope_T_Role bllRole = new Hope.BLL.Hope_T_Role();
protected void CheckUserPermission( enumRole objEnumRole )
{
bool isAllowAccess=false;//是否允许访问
if (Session["HopeUser"] == null)
{
isAllowAccess = false;
}//Session不存在时
Hope.Model.Hope_T_User objUser= (Hope.Model.Hope_T_User)Session["HopeUser"];
int roleId=0;
if (objUser != null)
{
roleId = Convert.ToInt32(objUser.User_RoleId);
}
Hope.Model.Hope_T_Role role = bllRole.GetModel(roleId);

if (role == null)
{
isAllowAccess = false;
}
else
{
switch (objEnumRole)
{
#region
case (enumRole.Role_PostArticle):
if (role.Role_PostArticle != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageArticle):
if (role.Role_ManageArticle != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageInfo):
if (role.Role_ManageInfo != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageLink):
if (role.Role_ManageLink != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageLog):
if (role.Role_ManageLog != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageRole):
if (role.Role_ManageRole != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageSystem):
if (role.Role_ManageSystem != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageUser):
if (role.Role_ManageUser != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageVote):
if (role.Role_ManageVote != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageAd):
if (role.Role_ManageAd != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageDoc):
if (role.Role_ManageDoc != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
case (enumRole.Role_ManageRate):
if (role.Role_ManageRate != "1")
isAllowAccess = false;
else
isAllowAccess = true;
break;
#endregion
}
}
if (isAllowAccess == false)
{
Response.Write("<script type=\"text/javascript\">alert(\"抱歉，您无权限查看此页" + role.Role_ManageAd + "。\");return false;</script>");
}
}
}
/**//// <summary>
/// 角色权限
/// </summary>
public enum enumRole
{
#region
/**//// <summary>
/// 是否允许发布文章
/// </summary>
Role_PostArticle=1,
/**//// <summary>
/// 是否允许管理文章
/// </summary>
Role_ManageArticle,
/**//// <summary>
/// 是否允许管理链接
/// </summary>
Role_ManageLink,
/**//// <summary>
/// 是否允许管理附属信息
/// </summary>
Role_ManageInfo,
/**//// <summary>
/// 是否允许管理日志
/// </summary>
Role_ManageLog,
/**//// <summary>
/// 是否允许管理系统
/// </summary>
Role_ManageSystem,
/**//// <summary>
/// 是否允许管理投票
/// </summary>
Role_ManageVote,
/**//// <summary>
/// 是否允许管理用户
/// </summary>
Role_ManageUser,
/**//// <summary>
/// 是否允许管理角色
/// </summary>
Role_ManageRole,
/**//// <summary>
/// 是否允许管理广告
/// </summary>
Role_ManageAd,
/**//// <summary>
/// 管理下发文件
/// </summary>
Role_ManageDoc,
/**//// <summary>
/// 管理利率
/// </summary>
Role_ManageRate
#endregion
}

public partial class manage_manage_user_add :AdminPermission//继承公共类
{
protected void Page_Load(object sender, EventArgs e)
{
if(!IsPostBack)
{
CheckUserPermission(enumRole.Role_ManageUser);//验证权限
}
}
//…
}