从别的网页上抓取部分内容 实现我自己的功能
我想从另一个网站中抓取新闻列表到我的网站中，我现在能得到目标源代码，并在TEXTBOX文本中显示，怎么处理这段内容只保留我想要的HTML片段内容？
也就是说我想再别的网页上抓取 人民币汇率那么一部分内容 放在我自己的网页上 ，现在整个网页是抓出来了 我想的是怎么去抓 我想要的那一部分内容
[解决办法]
如果不知道正则，也可以通过两个指定的字符，取字符中的中间值。
Function GetKey(ByVal HTML, ByVal Start, ByVal Last)
Dim body1 = Split(HTML, Start)
Dim body2 = Split(body1(1), Last)
GetKey = body2(0)
End Function
[解决办法]
using System;using System.Net;using System.Text;using System.IO; public class Test { // Specify the URL to receive the request. public static void Main (string[] args) { HttpWebRequest request = (HttpWebRequest)WebRequest.Create (args[0]); // Set some reasonable limits on resources used by this request request.MaximumAutomaticRedirections = 4; request.MaximumResponseHeadersLength = 4; // Set credentials to use for this request. request.Credentials = CredentialCache.DefaultCredentials; HttpWebResponse response = (HttpWebResponse)request.GetResponse (); Console.WriteLine ("Content length is {0}", response.ContentLength); Console.WriteLine ("Content type is {0}", response.ContentType); // Get the stream associated with the response. Stream receiveStream = response.GetResponseStream (); // Pipes the stream to a higher level stream reader with the required encoding format. StreamReader readStream = new StreamReader (receiveStream, Encoding.UTF8); Console.WriteLine ("Response stream received."); Console.WriteLine (readStream.ReadToEnd ()); response.Close (); readStream.Close (); } }/*The output from this example will vary depending on the value passed into Main but will be similar to the following:Content length is 1542Content type is text/html; charset=utf-8Response stream received.<html>...</html>*/