c#怎么在webbrowser中自动关闭网页弹出的js的alert对话框

c#如何在webbrowser中自动关闭网页弹出的js的alert对话框
c#的Winform窗体，用webbrowser读取一个网页，网页的js脚本会弹出一个alert对话框。
请问如何能够阻止这种js的alert对话框弹出？或者自动关闭掉这个js的alert对话框？

查了一些办法，都不起作用，我是新手，请大家给指点一下吧。谢谢了！

------解决方案--------------------
参考以下代码：

using System.Web;

using System.Net;

using System.IO;

using System.Text.RegularExpressions;

 

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

 

private void button1_Click(object sender, EventArgs e)

{

string url = "http://www.msn.com";

string htmlDocText = TrimScript(GetHtmlContent(url));

File.WriteAllText("D:\\temp.htm", htmlDocText);

webBrowser1.Url = new Uri("D:\\temp.htm");

}

 

private string GetHtmlContent(string url)

{

string htmlContentText = String.Empty;

HttpWebRequest httpWebRequest = null;

HttpWebResponse httpWebResponse = null;

StreamReader streamReader = null;

try

{

httpWebRequest = (HttpWebRequest)WebRequest.Create(url);

httpWebResponse = (HttpWebResponse)httpWebRequest.GetResponse();

httpWebRequest.Timeout = 5000;

 

streamReader = new StreamReader(httpWebResponse.GetResponseStream(), Encoding.Default);

htmlContentText = streamReader.ReadToEnd();

streamReader.Close();

httpWebResponse.Close();

}

catch { }

finally

{

httpWebResponse.Close();

streamReader.Close();

}

return htmlContentText;

}

 

private string TrimScript(string htmlDocText)

{

string bodyText = "";

string trimJavascript = "<script type=\"text/javascript\">(.*?)</script>";

Regex regexTrimJs = new Regex(trimJavascript);

bodyText = regexTrimJs.Replace(htmlDocText, "");

return bodyText;

}

}