C# 页面基类

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.ComponentModel;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Collections;

namespace UserManager
{
    [DesignerCategory("ASPXCodeBehind")]
    public class PageBase : System.Web.UI.Page
    {
        protected override void OnLoad(EventArgs e)
        {
            Context.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            ////首次加载,检查权限;再次加载,检查是否登录或超时
              if ((CheckPermission() && !IsPostBack) || (IsPostBack && Session["loginuser_id"] != null))
            {
                base.OnLoad(e);
            }
            if (!this.IsPostBack)
            {
                base.OnLoad(e);
            }
        }

        /// <summary>
        /// 将对象保存到Session中
         /// </summary>
        /// <param name="name">键名</param>
        /// <param name="value">键值</param>       
        protected virtual void SaveToSession(string name, object value)
        {
            if (Session[name] == null)
            {
                Session.Add(name, value);
            }
            else
            {
                Session[name] = value;
            }
        }

        /// <summary>
        /// 将对象从Session中移出
         /// </summary>
        /// <param name="name">键名</param>
        protected virtual void RemoveSession(string name)
        {
            if (Session[name] != null)
            {
                Session.Remove(name);
            }
        }

        /// <summary>
        /// 获取Session值
         /// </summary>
        /// <param name="name">键名</param>
        /// <returns>键值</returns>
        protected virtual object GetFromSession(string name)
        {
            return Session[name];
        }

        /// <summary>
        /// 将对象保存到ViewState中
         /// </summary>
        /// <param name="name">键名</param>
        /// <param name="value">键值</param>
        protected virtual void SaveToViewState(string name, object value)
        {
            if (ViewState[name] == null)
            {
                ViewState.Add(name, value);
            }
            else
            {
                ViewState[name] = value;
            } 
        }

        /// <summary>
        /// 获取ViewState值
         /// </summary>
        /// <param name="name">键名</param>
        /// <returns>键值</returns>
        protected virtual object GetFromViewState(string name)
        {
            return ViewState[name];
        }

        /// <summary>
        /// 将对象从ViewState中移出
         /// </summary>
        /// <param name="name">键名</param>
        protected virtual void RemoveViewState(string name)
        {
            if (ViewState[name] != null)
            {
                ViewState.Remove(name);
            }
        }

        /// <summary>
        /// 弹出提示信息
         /// </summary>
        /// <param name="msg">信息内容</param>
        protected virtual void ShowMessage(string msg)
        {
            ClientScript.RegisterStartupScript(GetType(), "___asp2TrainingShowMessage",
                                                 "<script language=\"javascript\">var str=\"" +
                                                 msg.Replace("\\", "\\\\").Replace("\r\n", " ").Replace("\"", "'") +
                                                 "\";alert(str.replace(/<br>/g,'\\n').replace(/<BR>/g,'\\n'));</script>");
        }

        /// <summary>
        /// 向页面写入脚本
         /// </summary>
        /// <param name="key">Key</param>
        /// <param name="content">内容</param>
        protected virtual void RegisterJavaScript(string key,string content)
        {
            if (key == null || key.Equals(""))
            {
                key = "___asp2TrainingFunctionJavascript";
            }

            if (content == null)
            {
                content = "";
            }

            ClientScript.RegisterStartupScript(GetType(), key, "<script>" + content + "</script>");
        }

        /// <summary>
        /// 检查用户权限
         /// </summary>
        protected virtual bool CheckPermission()
        {
            if (Session["userModuleList"] != null)
            {
                ArrayList userModuleList = (ArrayList)Session["userModuleList"];
                string path = Request.Path.Substring(Request.ApplicationPath.Length + 1);
                if (!userModuleList.Contains(path))
                {
                    Response.Redirect(Request.ApplicationPath + "/NoPermission.aspx");
                    return false;
                }
                else
                {
                    return true;
                }
            }
            else
            {
                Response.Write("<script language=\"javascript\">alert('您未登录或长时间未操作,请重新登录');window.top.location = '" + Request.ApplicationPath + "';</script>");
                return false;
            }
        }

        protected int LoginUser_Id
        {
            get 
            {
                if (Session["loginuser_id"] == null)
                {
                    return 0;
                }
                else
                {
                    return int.Parse(Session["loginuser_id"].ToString());
                }
            }
        }

        protected string LoginUser_Address
        {
            get 
            {
                return Page.Request.UserHostAddress;
            }
        }
    }
}

把一些,如页面跳转,消息提示,页面加载验证(是否登录等信息)--可以放到基类中