asp.Net Webページの画像を収集する具体的な方法

ネット上で探すと文字列操作でimgラベルを見つけることが多いので、操作が面倒で、コードが疲れているように見えます.ここで私が使っている方法は、WebBrowserでページをロードし、HTML Documentクラスで文字列操作を省くステップを操作し、GetElementsByTagNameを直接呼び出してすべてのピクチャアドレスをHtmlElementCollectionオブジェクトに返すことです.
コードは次のとおりです.

 
  
using System; 
  
using System.Collections.Generic; 
  
using System.Linq; 
  
using System.Text; 
  
using System.Text.RegularExpressions; 
  
using System.Net; 
  
using System.IO; 
  
using System.Windows.Forms; 
  
namespace WindowsFormsApplication1 
  
{ 
  
    public class GatherPic 
  
    { 
  
        private string savePath; 
  
        private string getUrl; 
  
        private WebBrowser wb; 
  
        private int iImgCount; 
  
        //      
  
        public GatherPic(string sWebUrl, string sSavePath) 
  
        { 
  
            this.getUrl = sWebUrl; 
  
            this.savePath = sSavePath; 
  
        } 
  
        //     
  
        public bool start() 
  
        { 
  
            if (getUrl.Trim().Equals("")) 
  
            { 
  
                MessageBox.Show("           ！"); 
  
                return false; 
  
            } 
  
            this.wb = new WebBrowser(); 
  
            this.wb.Navigate(getUrl); 
  
            //     
  
            this.wb.DocumentCompleted += new System.Windows.Forms.WebBrowserDocumentCompletedEventHandler(DocumentCompleted); 
  
            return true; 
  
        } 
  
        //WebBrowser.DocumentCompleted     
  
        private void DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e) 
  
        { 
  
            //     iframe       SearchImgList() 
  
            if (e.Url != wb.Document.Url) return; 
  
            SearchImgList(); 
  
        } 
  
        //              
  
        public void SearchImgList() 
  
        { 
  
            string sImgUrl; 
  
            //         
  
            HtmlElementCollection elemColl = this.wb.Document.GetElementsByTagName("img"); 
  
            this.iImgCount = elemColl.Count; 
  
            foreach (HtmlElement elem in elemColl) 
  
            { 
  
                sImgUrl = elem.GetAttribute("src"); 
  
                //           
  
                SaveImageFromWeb(sImgUrl, this.savePath); 
  
            } 
  
        } 
  
        //         
  
        public int SaveImageFromWeb(string imgUrl, string path) 
  
        { 
  
            string imgName = imgUrl.ToString().Substring(imgUrl.ToString().LastIndexOf("/") + 1); 
  
            path = path + "\\" + imgName; 
  
            string defaultType = ".jpg"; 
  
            string[] imgTypes = new string[] { ".jpg", ".jpeg", ".png", ".gif", ".bmp" }; 
  
            string imgType = imgUrl.ToString().Substring(imgUrl.ToString().LastIndexOf(".")); 
  
            foreach (string it in imgTypes) 
  
            { 
  
                if (imgType.ToLower().Equals(it)) 
  
                    break; 
  
                if (it.Equals(".bmp")) 
  
                    imgType = defaultType; 
  
            } 
  
            try 
  
            { 
  
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(imgUrl); 
  
                request.UserAgent = "Mozilla/6.0 (MSIE 6.0; Windows NT 5.1; Natas.Robot)"; 
  
                request.Timeout = 10000; 
  
                WebResponse response = request.GetResponse(); 
  
                Stream stream = response.GetResponseStream(); 
  
                if (response.ContentType.ToLower().StartsWith("image/")) 
  
                { 
  
                    byte[] arrayByte = new byte[1024]; 
  
                    int imgLong = (int)response.ContentLength; 
  
                    int l = 0; 
  
                    // CreateDirectory(path); 
  
                    FileStream fso = new FileStream(path, FileMode.Create); 
  
                    while (l < imgLong) 
  
                    { 
  
                        int i = stream.Read(arrayByte, 0, 1024); 
  
                        fso.Write(arrayByte, 0, i); 
  
                        l += i; 
  
                    } 
  
                    fso.Close(); 
  
                    stream.Close(); 
  
                    response.Close(); 
  
                    return 1; 
  
                } 
  
                else 
  
                { 
  
                    return 0; 
  
                } 
  
            } 
  
            catch (WebException) 
  
            { 
  
                return 0; 
  
            } 
  
            catch (UriFormatException) 
  
            { 
  
                return 0; 
  
            } 
  
        } 
  
    } 
  
} 
  
//-----------------    -------------------- 
  
GatherPic gatherpic = new GatherPic(“http://www.baidu.com”,"C:\test"); 
  
//   c:\   test   
  
gatherpic.start()