c#扑捉网页弹出对话框的代码

来源：互联网发布：网站域名是什么意思编辑：程序博客网时间：2024/04/30 05:51

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication1
{
    //关键点1：必须有此属性，否则WebBrowser无法调用此类中的public方法
    [System.Runtime.InteropServices.ComVisible(true)]
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();

            //关键点2
            this.webBrowser1.ObjectForScripting = this;
        }

        //关键点3：用WebBrowser的Navigated事件
        private void webBrowser1_Navigated(object sender, WebBrowserNavigatedEventArgs e)
        {
            //关键点4：必须添加对 Microsoft.mshtml.dll 程序集的引用，否则编译不过去
            mshtml.IHTMLWindow2 win = this.webBrowser1.Document.Window.DomWindow as mshtml.IHTMLWindow2;

            //关键点5：改写alert/confirm，如果有必要，可以仿照confirm的样子把showModalDialog也重写掉
            //其中，window.external后面的方法就是调本类中public方法
            win.execScript("window.alertOriginal = window.alert;", "JScript");
            win.execScript("window.alert = function(str) { alertOriginal(str); window.external.WebAlert(str); };", "JScript");
            win.execScript("window.confirmOriginal = window.confirm;", "JScript");
            win.execScript("window.confirm = function(str) { var r = confirmOriginal(str); if (r) window.external.WebConfirmOK(str); else window.external.WebConfirmCancel(str); return r; };", "JScript");
        }

        //关键点6：必须为public
        public void WebAlert(string str)
        {
            this.label1.Text = "alert: " + str + " ---> OK";
        }
        public void WebConfirmOK(string str)
        {
            this.label1.Text = "confirm: " + str + " ---> OK";
        }
        public void WebConfirmCancel(string str)
        {
            this.label1.Text = "confirm: " + str + " ---> Cancel";
        }
    }
}