c#未将对象引用设置到对象的实例 很急 求各路大神帮忙啊

[lllaoe]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using AIV_BLL;
using AIV_DAL;
using AIV_UI;
using System.IO;
using System.Data;
using AIV_Common;
using System.Threading;
using System.Configuration;
using System.Windows.Forms;
using AIV_UI.WebSiteSearch;

namespace AIV_UI.QuickWin
{
class clsESLErrorExtract_Thread
{
#region form
frmESLErrorExtract frm;
#endregion


#region 属性
private Thread extractThread;

//确定是否要重新开始加载的计数变量
static int beginTime = 0;

//5秒钟检查一次网页是否加载完成的Timer控件
System.Timers.Timer cpTimer = new System.Timers.Timer();

//根据登录页面传入的重新开始查找时间监控等待时间的Timer控件
System.Timers.Timer againTimer = new System.Timers.Timer();

//取得设定的重新开始查找的计时时间
private int RTime = Convert.ToInt32(ConfigurationManager.AppSettings["ResporceTime"].ToString());

//当前日期
string strCurrentDate = string.Empty;

String strUserId = Utility.GlobalUserId;

#endregion

#region 对象参数
//数据DownLoad中过程显示webbrowser
private System.Windows.Forms.WebBrowser wbESL;
public System.Windows.Forms.WebBrowser WbESL
{
get { return wbESL; }
set { wbESL = value; }
}

//数据导成EXCEL进度条
private System.Windows.Forms.ProgressBar extractProgress;
public System.Windows.Forms.ProgressBar ExtractProgress
{
get { return extractProgress; }
set { extractProgress = value; }
}
#endregion


#region 线程控制方法
internal void Start()
{
extractThread = new Thread(DoExtract);
extractThread.IsBackground = true;

extractThread.Start();
}

internal void Stop()
{
if (extractThread != null)
{
extractThread.Abort();
extractThread = null;
}
}
#endregion



private void DoExtract()
{
SearchData();
//5秒钟检查一次网页是否加载完成的Timer控件
cpTimer.Interval = 5000;
cpTimer.Elapsed += new System.Timers.ElapsedEventHandler(cpTimer_Tick);

//根据登录页面传入的重新开始查找时间监控等待时间的Timer控件
againTimer.Interval = 1000;
againTimer.Elapsed += new System.Timers.ElapsedEventHandler(againTimer_Tick);

//得到当前日期时间，精确到毫秒
strCurrentDate = DateTime.Now.ToString("yyyy-MM-dd hh:mm:ss.fff");



}
#region
private void SearchData()
{

//是否使用代理状态变量
string strProxyStatus = ConfigurationManager.AppSettings["ProxyStatus"].ToString();
if ("true".Equals(strProxyStatus))
{
//代理字符串
string strProxy = ConfigurationManager.AppSettings["ProxyServerAddress"].ToString();
//添加代理
AIV_UI.QuickWin.WinProxy.RefreshIESettings(strProxy);
}

//打开初始页面

//cpTimer.Start();
//againTimer.Start();

//WbESL.Navigate("https://am-i.serviceportal.hp.com/pls/onbsm/tng_html.p_application?RememberMe=false&RememberMe=false&RememberMe=false&RememberMe=false");

bool isFirst = true;
if (isFirst)
{
//页面加载完成监听事件
this.wbESL.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wbESL_DocumentCompleted);
this.wbESL.ProgressChanged += new WebBrowserProgressChangedEventHandler(wbESL_ProgressChanged);
isFirst = false;
//打开登陆页面
wbESL.Navigate("https://am-i.serviceportal.hp.com/pls/onbsm/tng_html.p_application?RememberMe=false&RememberMe=false&RememberMe=false&RememberMe=false");

}
}
private void wbESL_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
{
if (wbESL.ReadyState != WebBrowserReadyState.Complete)
{
return;
}
//得到当前的网址
string url = wbESL.Url.ToString();
//登录页面网址
string url_logon = "https://am-i.serviceportal.hp.com/pls/onbsm/tng_html.p_application?RememberMe=false&RememberMe=false&RememberMe=false";
//如果是登录页面
if (url.IndexOf(url_logon) != -1)
{
//从参数中取得用户名和密码
string strUserName = Utility.GlobalUserEmail;// "[e-mail]";
EmployeeFacade _Execute_GetUserList = new EmployeeFacade();
EmployeeData UserList = _Execute_GetUserList.GetEmployeeInfo(strUserId);
DataRow dr = UserList.Tables[EmployeeData.TABLE_EMPLOYEE].Rows[0];
string strPassWord = "";
if (dr[EmployeeData.NT_PASSWORD].ToString() != String.Empty)
{
strPassWord = dr[EmployeeData.NT_PASSWORD].ToString();
}
else
{
MessageBox.Show(Message.MASS_WRONG_NTPASSWORD, Message.SYSTEM_WARNING, MessageBoxButtons.OK, MessageBoxIcon.Warning);

}
if (strPassWord != String.Empty)
{
strPassWord = Encrypt.MyEncrypt.IsUnEncrypt(strPassWord);
}
//取得页面上的用户名和密码标签
HtmlElement htmlUserName = wbESL.Document.GetElementById("USER");
HtmlElement htmlPassWord = wbESL.Document.GetElementById("PASSWORD");


//如果参数和标签都不为空
if (strUserName != null && strPassWord != null && htmlUserName != null && htmlPassWord != null)
{
htmlUserName.SetAttribute("value", "");
htmlPassWord.SetAttribute("value", "");
htmlUserName.SetAttribute("value", strUserName);
htmlPassWord.SetAttribute("value", strPassWord);
//调用submit方法
wbESL.Navigate("javascript:trimAndSubmit();");
return;
}
if (url.Equals("https://am-i.serviceportal.hp.com/pls/onbsm/tng_html.p_application?RememberMe=false&RememberMe=false&RememberMe=false&RememberMe=false"))
{
wbESL.Navigate("https://am-i.serviceportal.hp.com/pls/onbsm/onb_process_view.show_page?sa_arg=1110281");
return;
}
}
}
#endregion
private void cpTimer_Tick(object sender, EventArgs e)
{
Console.WriteLine(beginTime);
int lijiTime = RTime * 1000;
if (beginTime > lijiTime)
{
beginTime = 0;
wbESL.Navigate("https://am-i.serviceportal.hp.com/pls/onbsm/tng_html.p_application?RememberMe=false&RememberMe=false&RememberMe=false");
}
}
private void againTimer_Tick(object sender, EventArgs e)
{
beginTime += 1000;
}

private void wbESL_ProgressChanged(object sender, WebBrowserProgressChangedEventArgs e)
{
int cp = Convert.ToInt32(e.CurrentProgress);
if (cp == -1)
{
beginTime = 0;
}
//Console.WriteLine("当前 进度" + cp);
}








}
}

[bdmh]

自己调试吧，肯定是null对象，提示会告诉你在哪一行，自己看吧

[lllaoe]

总是在wbESL报错 说未将对象引用设置到对象的实例

[lllaoe]

this.wbESL.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wbESL_DocumentCompleted); 这出错 不知道为什么 我调了很长时间了

[threenewbee]

wbESL是一个webbrowser，它是否存在？ 它是否导航到了对应的网页？ 网页中有没有你指定的html元素。 建议调试下。

[lllaoe]

引用 1 楼 bdmh 的回复:

自己调试吧，肯定是null对象，提示会告诉你在哪一行，自己看吧

this.wbESL.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(wbESL_DocumentCompleted); 这出错 不知道为什么 我调了很长时间了