utility.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Collections.Generic;
using BookManage.Model;

public class Message
{
    public static void Alert(object msg,Page page)
    {
       
        string message = "<script language=\"javascript\" type=\"text/javascript\">alert(\"";
        message += msg;
        message += "\")</script>";
        page.RegisterStartupScript("alert", message);
        
    }
    public static void Alert(object msg, string url)
    {
        string message = "<script language=\"javascript\" type=\"text/javascript\">alert(\"";
        message += msg;
        message += "\");";
        message += "location.href=\"";
        message += url;
        message += "\";</script>";
        HttpContext.Current.Response.Write(message);
        HttpContext.Current.Response.End();
    }
    public static void Alert(object msg, bool backToHistory)
    {
        string message = "<script language=\"javascript\" type=\"text/javascript\">alert(\"";
        message += msg;
            if (!backToHistory)
            {
                message += "\")</script>";
            }
            else
            {
                message += "\");";
                message += "history.back(-1);</script>";
            }
        HttpContext.Current.Response.Write(message);
        HttpContext.Current.Response.End();
    }
}

public class BookManageSecurity
{
    /// <summary>
    /// 从Cookie中获取用户权限
    /// </summary>
    /// <returns></returns>
    public static int GetUserRoleFromCookie()
    {
        HttpCookie cookie = HttpContext.Current.Request.Cookies[FormsAuthentication.FormsCookieName];
        FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(cookie.Value);
        int userPower = Convert.ToInt16(ticket.UserData);
        return userPower;
    }

    /// <summary>
    /// 检查是否有管理员权限
    /// </summary>
    public static void CheckAdminPermission()
    {
        if (GetUserRoleFromCookie() != (int)EMUserProfile.UserRole.Admin)
            Message.Alert("你没有足够的权限进入此页面", true);
    }
}