C# webBrowser.DocumentCompleted 解决之道

最近学习devexpress，视频都在http://tv.devexpress.com，一个一个下载又嫌麻烦，于是费劲千辛万苦写了个DEMO来半自动下载，相信还可以再完善。

遇到的一个最困难的问题是：如何判断C#的webBrowser的是否文档加载完成，参考了很多资料，配合某些特定的状态字段判断，完美解决了如何解析AJAX加载的文档内容。

上图效果图：1、输入分类地址，2、点击下载，自动下载分类下的视频。

C#代码

using System;
using System.IO;
using System.Windows.Forms;
using Yejq;

namespace devexpresstv
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();
        }

        String[] movies = new string[100];
        int i = 0;

        private void button_downNow_Click(object sender, EventArgs e)
        {
            // 添加事件响应函数 
            webBrowser1.DocumentCompleted +=
                new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(webBrowser_DocumentCompleted_downNow);
            webBrowser1.Url = new Uri(textBox_url.Text);
        }
        private void webBrowser_DocumentCompleted_downNow(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            movies = new string[100];
            i = 0;
            int pages = 0;
            label_log.Text = "开始解析……";
            HtmlElementCollection collection = webBrowser1.Document.Links;
            label_log.Text = "开始解析…………";
            foreach (HtmlElement elem in collection) //遍历所有元素
            {
                string href = elem.GetAttribute("href");
                if (href.EndsWith(".movie") && !href.StartsWith("mailto:") &&
                    !href.Contains("ClinicalTrialASPNET") && !href.Contains("DevelopMultiChannelApps") &&
                    !href.Contains("DevToolsROIForrester") && !href.Contains("SchedulingSnap"))
                {
                    movies[i] = href;
                    i++;
                }
                if (href.StartsWith("javascript:ChangePage"))
                {
                    pages++;
                }
            }

            label_log.Text = "视频数：" + i + ",页数：" + pages;
            string fileContent = "";
            for (int j = 0; j < i; j++)
            {
                fileContent += movies[j] + System.Environment.NewLine;
            }

            if (i > 0)
            {
                StreamWriter writer = new StreamWriter("1.txt");
                writer.Write(fileContent + "pages：" + pages);
                writer.Flush();
                writer.Close();

                for (int x = i - 1; x >= 0; x--)
                {
                    label_log.Text = "正在下载：" + movies[x];
                    webBrowser1.DocumentCompleted +=
                        new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(
                            webBrowser_DocumentCompleted_downMovice);
                    webBrowser1.Url = new Uri(movies[x]);
                }
            }
        }
        
        private int downTimes = 1;
        string link = "";
        private void webBrowser_DocumentCompleted_downMovice(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            label_log.Text = "开始解析……";
            string title = webBrowser1.DocumentTitle;
            label_log.Text = "标题：" + title;

            HtmlElementCollection collection = webBrowser1.Document.Links;
            foreach (HtmlElement elem in collection) //遍历所有元素
            {
                string href = elem.GetAttribute("href");
                if (href.EndsWith(".mp4"))
                {
                    link = href;
                    break;
                }
            }
            if (!string.IsNullOrEmpty(link))
            {
                title = title.Substring(0, title.IndexOf(" - DevExpress Channel Movie"));
                label_log.Text = "下载地址：" + link;
                HttpDownLoad downLoad = new HttpDownLoad();
                string filePath = @"G:\temp\" + downTimes + " " + title;
                if (!Directory.Exists(filePath))
                {
                    Directory.CreateDirectory(filePath);
                }
                string path = filePath + "\\" + link.Substring(link.LastIndexOf("/") + 1);
                label_log.Text = "下载到：" + path;
                downLoad.httpDownFile(link, path, progressBar1, label_progress);
                downTimes++;
            }
        }

    }
}

 循环下载的时候还是有问题 ~~~ 真麻烦