防止刷新提交页面！

 方法一：

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;

public   class  BasePage : System.Web.UI.Page
{
     private   readonly   string  REFRESH_TICKET_NAME  =   " __RefreshTicketArray " ;
     private   readonly   string  HIDDEN_FIELD_NAME  =   " __RefreshHiddenField " ;
     private   readonly   string  HIDDEN_PAGE_GUID  =   " __RefreshPageGuid " ;

     ///  

     ///  为True表示页面刷新,False为正常提交
     ///  

     public   bool  IsPageRefreshed
    {
         get
        {
             if  (IsPostBack  &&   ! CheckRefreshFlag())
            {
                 return   true ;
            }
             else
            {
                 return   false ;
            }
        }
    }

     ///  

     ///  呈现前更新标识
     ///  

     ///  
     protected   override   void  OnPreRender(EventArgs e)
    {
         base .OnPreRender(e);
        UpdateRefreshFlag();
    }


     ///  

     ///  更新标识,正常提交都删除该次提交的时间,并生产当前新的时间
     ///  

     private   void  UpdateRefreshFlag()
    {

         #region  Cookie模式

         // 注册页面唯一标识并返回
         string  pageGuid  =  SetCurPageGuid();

        HttpCookie cookie  =  GetRefreshTicket();

         if  (cookie.Values.Count  >   0 )
        {
            cookie.Values.Remove(pageGuid);
        }

         string  submitTime  =  DateTime.Now.ToString( " hhmmss.fffff " );
         // 当前提交时间保存到隐藏域
        ClientScript.RegisterHiddenField(HIDDEN_FIELD_NAME, submitTime);

        cookie.Values.Add(pageGuid, submitTime);

        Response.AppendCookie(cookie);

         #endregion

    }


     ///  

     ///  验证是否刷新
     ///  

     ///  
     private   bool  CheckRefreshFlag()
    {
        HttpCookie cookie  =  GetRefreshTicket();
         string  pageGuid  =  GetCurPageGuid();
         if  (cookie.Values.Count  >   0 )
        {
             bool  flag;
             if  (cookie.Values[pageGuid]  !=   null )
                flag  =  cookie.Values[pageGuid].IndexOf(GetCurSubmitTime())  >   - 1 ;
             else
                flag  =   true ; // 防止出现异常,总是可以提交
             return  flag;
        }
         return   true ;
    }


     ///  

     ///  得到已保存的提交时间,没有新建,有返回
     ///  

     ///  
     private  HttpCookie GetRefreshTicket()
    {
         #region  Cookie模式,返回值为Cookie

        HttpCookie cookie;
         if  (Request.Cookies[REFRESH_TICKET_NAME]  ==   null )
        {
            cookie  =   new  HttpCookie(REFRESH_TICKET_NAME);
            Response.AppendCookie(cookie);
        }
         else
        {
            cookie  =  Request.Cookies[REFRESH_TICKET_NAME];
        }
         return  cookie;
         #endregion
    }


     ///  

     ///  获取当前提交时间
     ///  

     ///  
     private   string  GetCurSubmitTime()
    {
         string  submitTime  =  Request.Params[HIDDEN_FIELD_NAME]  ==   null   ?   ""  : Request.Params[HIDDEN_FIELD_NAME].ToString();
         return  submitTime;
    }


     ///  

     ///  设置页面唯一标识,通过Guid标识来区分每个页面自己的提交时间
     ///  

     private   string  SetCurPageGuid()
    {
         string  guid;
         if  ( ! IsPostBack)
        {
             if  (Request.Params[HIDDEN_PAGE_GUID]  ==   null )
            {
                guid  =  System.Guid.NewGuid().ToString();
            }
             else
                guid  =  GetCurPageGuid();
        }
         else
        {
            guid  =  GetCurPageGuid();
        }

        ClientScript.RegisterHiddenField(HIDDEN_PAGE_GUID, guid);
         return  guid;
    }



     ///  

     ///  得到当前页面的唯一标识
     ///  

     ///  
     private   string  GetCurPageGuid()
    {
         string  pageGuid  =  Request.Params[HIDDEN_PAGE_GUID]  ==   null   ?   " none "  : Request.Params[HIDDEN_PAGE_GUID].ToString();
         return  pageGuid;
    }
}

 方法二：

 

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;
public   class  BasePage : System.Web.UI.Page
{
     public  BasePage()
    {
         //
         //  TODO: 在此处添加构造函数逻辑
         //
    }
     #region  IsRefreshed
     ///  

     ///  IsRefreshed
     ///  

     public   bool  IsRefreshed
    {
         get
        {
             string  requestPath  =  HttpContext.Current.Request.Path;
             return  ( bool )HttpContext.Current.Items[requestPath  +   " _IsRefreshed " ];
        }
    }

     #endregion
     ///  
     ///  重写OnPreRenderComplete,生成隐藏域CurrentTicket 
     ///  
     ///  
     protected   override   void  OnPreRenderComplete(EventArgs e)
    {
         base .OnPreRenderComplete(e);
         string  requestPath  =  HttpContext.Current.Request.Path;
         int  ticket  =   int .Parse(HttpContext.Current.Items[requestPath  +   " _NextTicket " ].ToString());
        ClientScript.RegisterHiddenField( " CurrentTicket " , ticket.ToString());
    }
}
     ///  

     ///  NoRepeatOperModule 的摘要描述
     ///  

     public   class  NoRepeatOperModule : IHttpModule
    {
         public  NoRepeatOperModule()
        {
             //
             //  TODO: 
             //
        }

         ///  

         ///  保存访问的页面记录,以页面路径为key, 标号为value
         ///  

         static  Hashtable historyRequest  =   null ;

         ///  

         ///  请求路径
         ///  

         private   string  RequestPath
        {
             get
            {
                 return  HttpContext.Current.Request.Path;
            }
        }

         #region  IHttpModule 成员

         public   void  Dispose()
        {
             // throw new Exception("The method or operation is not implemented.");
        }

         public   void  Init(HttpApplication context)
        {
             if  (historyRequest  ==   null )
            {
                historyRequest  =   new  Hashtable();
            }

            context.BeginRequest  +=   delegate ( object  sender, EventArgs e)
            {
                 int  lastTicket  =  GetLastTicket();
                 int  currentTicket  =  GetCurrentTicket(lastTicket);

                 //  比较当前标号和上一个的标号,判断页面请求是否来源于刷新操作
                 //  当前标号大于上一个标号 或初次请求都属于新的页面
                 if  (currentTicket  >  lastTicket  ||  (lastTicket  ==  currentTicket  &&  currentTicket  ==   0 ))
                {
                     //  标记并保存页面请求是否来源于刷新的bool值
                    HttpContext.Current.Items[RequestPath  +   " _IsRefreshed " ]  =   false ;
                    historyRequest[RequestPath]  =  currentTicket;
                }
                 else
                {
                    HttpContext.Current.Items[RequestPath  +   " _IsRefreshed " ]  =   true ;
                }
            };
        }

         #endregion

         /**/
         ///  

         ///  获取某页面的上一个标号
         ///  

         ///  
         private   int  GetLastTicket()
        {
             if  ( ! historyRequest.ContainsKey(RequestPath))
            {
                 return   0 ;
            }

             return   int .Parse(historyRequest[RequestPath].ToString());
        }

         /**/
         ///  

         ///  获取页面的当前标号
         ///  

         ///   上一个标号
         ///  
         private   int  GetCurrentTicket( int  lastTicket)
        {
             int  ticket;
             //  CurrentTicket 为页面的隐藏域的内容
             string  currentTicket  =  HttpContext.Current.Request[ " CurrentTicket " ];
             if  (currentTicket  ==   null )
            {
                ticket  =  lastTicket;
            }
             else
            {
                ticket  =   int .Parse(currentTicket);
            }

             //  保存页面的下一个标号
            HttpContext.Current.Items[RequestPath  +   " _NextTicket " ]  =  ticket  +   1 ;
             return  ticket;
        }

    }

     // webconfig配置
     //
     //   
     //
 

转载于:https://www.cnblogs.com/chjw8016/archive/2009/02/03/1383392.html