default.aspx.cs

征服ASP.NET 2.0 Ajax 典型应用源码

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 AjaxControlToolkit;
public partial class NoBot_Default : System.Web.UI.Page
{
    //输出需要客户端执行的脚本
    protected void NoBot1_GenerateChallengeAndResponse(object sender, AjaxControlToolkit.NoBotEventArgs e)
    {
        Label noBotLabel = new Label();//用于检验这个控件的高和宽的乘积
        Random rand = new Random();
        int width = rand.Next(80);//宽
        int height = rand.Next(120);//高
        noBotLabel.ID = string.Format("noBotLabel{0}", rand.Next(1000));//随机id
        noBotLabel.Width = width;
        noBotLabel.Height = height;
        noBotLabel.Style.Add(HtmlTextWriterStyle.Visibility, "hidden");//隐藏label，防止对页面布局的干扰
        noBotLabel.Style.Add(HtmlTextWriterStyle.Position, "absolute");
        (sender as NoBot).Controls.Add(noBotLabel);//把label添加入NoBot中
        //需要客户端执行的脚本
        e.ChallengeScript = string.Format("var noBotLabel = $get('{0}'); noBotLabel.offsetWidth * noBotLabel.offsetHeight;", noBotLabel.ClientID);
        e.RequiredResponse = (width * height).ToString();//需要客户端返回的结果
    }
    //数据插入前，检验是否为垃圾发布程序所为
    protected void DetailsView1_ItemInserting(object sender, DetailsViewInsertEventArgs e)
    {
        System.Threading.Thread.Sleep(2000);//休眠2秒，查看UpdateProgress的运行效果
        NoBotState state;
        if (NoBot1.IsValid(out state))//检验成功
        {
            Label1.Text = "您提交的成语已经录入成语数据库！";
        }
        else//检验失败
        {
            string errorMessage = string.Empty;
            switch (state)//根据检验失败的原因不同，给出相应的提示。
            {
                case NoBotState.InvalidAddressTooActive:
                    errorMessage = "该IP地址在短时间内提交了过多的请求。";
                    break;
                case NoBotState.InvalidBadResponse:
                    errorMessage = "浏览器检测脚本未被运行或运行结果不正确。";
                    break;
                case NoBotState.InvalidBadSession:
                    errorMessage = "ASP.NET会话状态不可用。";
                    break;
                case NoBotState.InvalidResponseTooSoon:
                    errorMessage = "两次发送表单的时间间隔过短。";
                    break;
                case NoBotState.InvalidUnknown:
                    errorMessage = "未知错误。";
                    break;
            }
            Label1.Text = string.Format("您的成语添加请求未被执行，原因为：{0}", errorMessage);
            e.Cancel = true;//取消插入数据
        }
    }
}