一个简单的问题，送分啦....

Question

     一个页面，需要验证码，我自己写了一个验证码
     在提交数据的时候，问题就来了
     如果我验证码输入是错误的，他提示验证码输入不正确！
     然后我在刷新页面，他又会在一次的去验证，结果又提示 验证码输入不正确
     现在我想 但验证码有误，提示之后，在刷新页面，页面不会再次验证...     提示代码是这样的  
ScriptManager.RegisterStartupScript(this, this.GetType(), "", "<script>alert('验证通过!');</script>", false);

Answer 1

刚刚用 if(!IsPostBack)  和 if(IsPostBack == false) 都试了试，结果都是老样子...

Answer 2

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;/// <summary>
/// BasePage 的摘要说明
/// </summary>
public class BasePage:System.Web.UI.Page
{
public BasePage()
{
//
// TODO: 在此处添加构造函数逻辑
//
    }
    #region IsRefreshed
    public bool IsRefreshed
    {
        get
        {
            string requestPath = HttpContext.Current.Request.Path;
            return (bool)HttpContext.Current.Items[requestPath + "_IsRefreshed"];
        }
    }
    #endregion
    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());
    }
}public class NoRepeatOperModel : IHttpModule
{
    public NoRepeatOperModel()
    {
    }
    static Hashtable historyRequest = null;
    private string RequestPath
    {
        get
        {
            return HttpContext.Current.Request.Path;
        }
    }
    #region IHttpModel 成员
    public void Dispose()
    {
    }
    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);
            if (currentTicket > lastTicket || (lastTicket == currentTicket && currentTicket == 0))
            {
                HttpContext.Current.Items[RequestPath + "_IsRefreshed"] = false;
                historyRequest[RequestPath] = currentTicket;
            }
            else
            {
                HttpContext.Current.Items[RequestPath + "_IsRefreshed"] = true;
            }
        };
    }
    #endregion
    private int GetLastTicket()
    {
        if (!historyRequest.ContainsKey(RequestPath))
        {
            return 0;
        }
        return int.Parse(historyRequest[RequestPath].ToString());
    }
    private int GetCurrentTicket(int LastTicket)
    {
        int ticket;
        string currentTicket = HttpContext.Current.Request["CurrentTicket"];
        if (currentTicket == null)
        {
            ticket = LastTicket;
        }
        else
        {
            ticket = int.Parse(currentTicket);
        }
        //保存下一个标号
        HttpContext.Current.Items[RequestPath + "_NextTicket"] = ticket + 1;
        return ticket + 1;
    }
}
让你的页面继承自basepage,代码部分用isrefreshed做判断试一下。