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）：

代码

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);

        }
    }
}