我可以使用这个正则表达式读取并下载页面上的.jpg文件列表

MatchCollection match = Regex.Matches(htmlText,@"http://.*?'b.jpg'b", RegexOptions.RightToLeft);

输出示例：http://somefiles.jpg从此行html中的<img src="http://somefiles.jpg"/>


问题：我如何读取这种格式的文件？

<a href="download/datavoila-setup.exe" id="button_download" title="Download your copy of DataVoila!" onclick="pageTracker._trackPageview('/download/datavoila-setup.exe')"></a>

我只想在页面上用.exe提取文件。所以在上面的例子中，我只想得到datavoila-setup.exe文件。对不起，我有点笨，弄不清怎么做。提前感谢任何能帮助我的人。：(

这是我更新的代码，但我在HtmlDocument doc=new HtmlDocument((上出错；部分"没有可用的源"，我得到列表的空值：(

 protected void Button2_Click(object sender, EventArgs e)
        {
            //Get the url given by the user
            string urls;
            urls = txtSiteAddress.Text;
            StringBuilder result = new StringBuilder();
            //Give request to the url given 
            HttpWebRequest requesters = (HttpWebRequest)HttpWebRequest.Create(urls);
            requesters.UserAgent = "";
            //Check for the web response
            WebResponse response = requesters.GetResponse();
            Stream streams = response.GetResponseStream();
            //reads the url as html codes
            StreamReader readers = new StreamReader(streams);
            string htmlTexts = readers.ReadToEnd();
            HtmlDocument doc = new HtmlDocument();
            doc.Load(streams);
            var list = doc.DocumentNode.SelectNodes("//a[@href]")
                         .Select(p => p.Attributes["href"].Value)
                         .Where(x => x.EndsWith("exe"))
                         .ToList();
           doc.Save("list");
           }

这是Flipbed的答案，它有效，但不是。我没有得到一个干净的捕获：(我认为在将html拆分为文本时有一些内容需要编辑

protected void Button2_Click(object sender, EventArgs e)
        {
            //Get the url given by the user
            string urls;
            urls = txtSiteAddress.Text;
            StringBuilder result = new StringBuilder();
            //Give request to the url given 
            HttpWebRequest requesters = (HttpWebRequest)HttpWebRequest.Create(urls);
            requesters.UserAgent = "";
            //Check for the web response
            WebResponse response = requesters.GetResponse();
            Stream streams = response.GetResponseStream();
            //reads the url as html codes
            StreamReader readers = new StreamReader(streams);
            string htmlTexts = readers.ReadToEnd();
            WebClient webclient = new WebClient();
            string checkurl = webclient.DownloadString(urls);
            List<string> list = new List<string>();//!3
            //Splits the html into with ' into texts
            string[] parts = htmlTexts.Split(new string[] { "'"" },//!3
             StringSplitOptions.RemoveEmptyEntries);//!3
            //Compares the split text with valid file extension
            foreach (string part in parts)//!3
            {
                if (part.EndsWith(".exe"))//!3
                {
                    list.Add(part);//!3
                    //Download the data into a Byte array
                    byte[] fileData = webclient.DownloadData(this.txtSiteAddress.Text + '/' + part);//!6
                    //Create FileStream that will write the byte array to
                    FileStream file =//!6
                            File.Create(this.txtDownloadPath.Text + "''" + list);//!6
                    //Write the full byte array to the file
                    file.Write(fileData, 0, fileData.Length);//!6
                    //Download message complete
                    lblMessage.Text = "Download Complete!";
                    //Clears the textfields content
                    txtSiteAddress.Text = "";
                    txtDownloadPath.Text = "";
                    //Close the file so other processes can access it
                    file.Close();
                    break;
                }
            }