C# WebBroswer读取html页面元素

前面的几个示例都 是对页面中的某一控件进行读取，而有时有些页面没有input控件，而只有一些常用页面元素，对于这样的页面读取就要换一种方式了：

这里就要用到HtmlDocument中的GetElementsByTagName方法，如果我们要读取某一页面中的第一个<a></a>可以这样使用：doc.GetElementsByTagName("a")[0];后面的就是索引的设定了;用的多了也就不觉得有什么内容了，直接上代码（电信的号码查询）：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.Web;


namespace 电信查询
{
    public partial class Form1 : Form
    {
        //WebService引用
        private objTele.Service1SoapClient objtele = new 电信查询.objTele.Service1SoapClient();
        //当前查询号码
        private string nowtnum = "";
        //当前查询ID
        private string nowtid = "";
        //当前用户余额
        private string nowtmoney = "";

        //当前用户名称
        private string nowtname = "";

        //上一个用户名
        private string oldtname = "";
        //上一个查询号码
        private string oldtnum = "";
        //上一个查询ID
        private string oldtid = "";
        //上一用户余额
        private string oldtmoney = "";
        //刷新页面次数
        private int islock = 0;
        public Form1()
        {
            InitializeComponent();
        }

        private void tspstart_Click(object sender, EventArgs e)
        {
            if (cbbtime.Text != "")
            {
                if (tspstart.Text == "开始查询")
                {
                    timer1.Interval = Convert.ToInt32(cbbtime.Text.ToString().Trim());
                    timer1.Enabled = true;
                    tspstart.Text = "停止查询";
                }
                else
                {
                    tspstart.Text = "开始查询";
                    timer1.Enabled = false;
                    timer2.Enabled = false;
                }
            }
            else
            {
                MessageBox.Show("请先设定查询时间间隔", "错误提示", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }
        }

        private void cbbtime_SelectedIndexChanged(object sender, EventArgs e)
        {
            if (cbbtime.Text != "")
            {
                timer1.Interval = Convert.ToInt32(cbbtime.Text.ToString().Trim());
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            webpage.Url = new Uri("http://www.1065921611.com/");
            lvorder.Columns.Add("编号", 40);
            lvorder.Columns.Add("号码", 80);
            lvorder.Columns.Add("姓名", 80);
            lvorder.Columns.Add("用户余额", 80);
            lvorder.Columns.Add("状态", 120);
            lvorder.Columns.Add("时间", 120);
            lvorder.GridLines = true; //显示表格线
            lvorder.View = View.Details;//显示表格细节
            lvorder.HeaderStyle = ColumnHeaderStyle.Clickable;//对表头进行设置
            lvorder.FullRowSelect = true;//是否可以选择行
            cbbtime.Text = "5000";
            this.Text = "电信查询";
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            string strtele = "";
            try
            {
                //从数据库中查询一条等待查询的数据
                strtele = objtele.selectOneSelectStratMobile(Encrypt(), "2");
                if (strtele != "")
                {
                    string[] stroder = strtele.Split(new string[] { "_" }, StringSplitOptions.RemoveEmptyEntries);
                    if (stroder[0] != "0" && stroder[1] != "0")
                    {
                        try
                        {
                            HtmlDocument doc = webpage.Document.Window.Frames[1].Document.Window.Frames[3].Document.Window.Frames[0].Document;
                            HtmlElement telenum = doc.All["chargePhone"];
                            HtmlElement submit = doc.GetElementsByTagName("a")[0];
                            nowtid = stroder[0].ToString().Trim();
                            nowtnum = stroder[1].ToString().Trim();
                            nowdo.Text = "正在查询用户：" + nowtnum.ToString() + "信息";
                            if (telenum == null || submit == null)
                            {
                                nowdo.Text = "网络受阻查询用户：" + nowtnum.ToString() + "信息失败";
                                databind(nowtid.ToString(), nowtnum.ToString(), "查询失败", "0", "网络受阻，查询失败", 9);
                                return;
                            }
                            telenum.SetAttribute("value", stroder[1].ToString());
                            submit.InvokeMember("click");
                            timer1.Enabled = false;
                            timer2.Enabled = true;
                            timer2.Interval = 2000;
                            islock = 0;
                        }
                        catch (Exception)
                        {
                            return;
                        }
                    }
                }
            }
            catch (Exception)
            {

                throw;
            }
        }

        //页面加载完成时发生
        private void webpage_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {

        }
        //页面开始刷新时执行
        private void webpage_Navigated(object sender, WebBrowserNavigatedEventArgs e)
        {

        }

        /// <summary> 
        /// 加密数据 
        /// </summary> 
        /// <returns></returns> 
        public static string Encrypt()
        {
            string Text = "asuygp834p8934g8ye893rehfvasu78698734r";
            string sKey = "as4564656uygp834p893";
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray;
            inputByteArray = Encoding.Default.GetBytes(Text);
            des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
            System.IO.MemoryStream ms = new System.IO.MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            return ret.ToString();
        }

        private void timer2_Tick(object sender, EventArgs e)
        {

            if (islock < 10 && !timer1.Enabled)
            {
                if (islock == 0 ||islock==3||islock==6)
                {
                    try
                    {
                        HtmlDocument doc = webpage.Document.Window.Frames[1].Document.Window.Frames[3].Document.Window.Frames[1].Document;
                        HtmlElement subref = doc.GetElementsByTagName("a")[0];
                        if (subref == null)
                        {
                            HtmlDocument doc1 = webpage.Document.Window.Frames[1].Document.Window.Frames[3].Document.Window.Frames[1].Document;
                            subref = doc1.GetElementsByTagName("a")[0];
                        }
                        subref.InvokeMember("click");
                    }
                    catch (Exception)
                    {
                        return;
                    }
                }
                else
                {
                    try
                    {
                        HtmlDocument doc = webpage.Document.Window.Frames[1].Document.Window.Frames[3].Document.Window.Frames[1].Document;
                        string userresult = doc.GetElementsByTagName("div")[6].GetElementsByTagName("ol")[0].InnerText.ToString();
                        string[] userinfo = userresult.Split(new string[] { " " }, StringSplitOptions.RemoveEmptyEntries);
                        if (userinfo.Length == 4)
                        {
                            if (userinfo[2].ToString().Trim() == nowtnum.ToString())
                            {
                                timer1.Enabled = true;
                                timer2.Enabled = false;
                                nowtname = userinfo[1].ToString().Trim();
                                nowtmoney = userinfo[3].ToString().Trim();
                                oldtid = nowtid.ToString();
                                oldtmoney = nowtmoney;
                                oldtname = nowtname;
                                oldtnum = nowtnum;
                                nowdo.Text = "查询用户：" + nowtnum.ToString() + "信息成功";
                                databind(nowtid, nowtnum, nowtname, nowtmoney, "查询成功", 8);
                            }
                        }
                       
                    }
                    catch (Exception)
                    {
                        islock++;
                        return;
                    }
                }
                islock++;
            }
            else
            {
                nowdo.Text = "查询用户：" + nowtnum.ToString() + "信息失败";
                nowtname = "查询失败";
                nowtmoney = "0";
                oldtid = nowtid.ToString();
                oldtmoney = nowtmoney;
                oldtname = nowtname;
                oldtnum = nowtnum;
                timer1.Enabled = true;
                timer2.Enabled = false;
                databind(nowtid, nowtnum, "无号码信息", "0", "无响应查询失败", 9);
            }
        }
        /// <summary>
        /// 联通充值数据信息状态更新
        /// </summary>
        /// <param name="ormd"> 信息编号</param>
        /// <param name="ormn">号码</param>
        /// <param name="ormoney">金额</param>
        /// <param name="state">状态</param>
        /// <param name="n">状态标识</param>
        private void databind(string ormd, string ormn, string name, string money, string state, int n)
        {
            bool id = false;
            objTele.SelectTelecom sTele = new 电信查询.objTele.SelectTelecom();
            sTele.sctId = Convert.ToInt32(ormd.Trim());
            sTele.sctName = name;
            sTele.sctExecTime = DateTime.Now;
            sTele.sctState = n;
            sTele.sctRemainAmount = Convert.ToDecimal(money.ToString());
            try
            {
                id = objtele.updateOneSelectTelecom(Encrypt(), sTele);
                if (!id)
                    id = objtele.updateOneSelectTelecom(Encrypt(), sTele);

            }
            catch (Exception)
            {
            }

            ListViewItem[] listViewItem = new ListViewItem[1];
            listViewItem[0] = new ListViewItem(new string[] { ormd, ormn, name, money + "元", state,DateTime.Now.ToString() });
            lvorder.Items.AddRange(listViewItem);

        }
    }
}