webBrowser捕获Alert内容（C#）

1.引用using mshtml;  //Microsoft HTML Object Library

2.[ComVisible(true)] //放到类的上边

public partial class Form1 : Form

3.//激活webBrowser1_Navigated事件

private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
        {
            IHTMLWindow2 ihtmlWin = webBrowser1.Document.Window.DomWindow as IHTMLWindow2;
            StringBuilder strAlertBuilder = new StringBuilder();
            strAlertBuilder.Append("var _alert=window.alert;\n");
            strAlertBuilder.Append("window.alert=function(s){\n");
            strAlertBuilder.Append("window.external.alertMessage(s);}");
            ihtmlWin.execScript(strAlertBuilder.ToString(), "Javascript");
        }

4. //接收alert的内容

public void alertMessage(string s)
        {
            this.textBox1.Text = s;
        }

5.关键

private void Form1_Load(object sender, EventArgs e)
        {
  webBrowser1.ObjectForScripting = this;//此属性是得到alert关键设置，否则可以禁止弹出，但是无法得到信息
  }