c# 获取网页源码

C#获取指定网页HTML原代码可使用 WebClient WebRequest HttpWebRequest 三种方式来实现。

当然也可使用webBrowse！在此就不研究webBrowse如何获取了。

WebClient 

private string GetWebClient(stringurl) {     stringstrHTML = "";    WebClient myWebClient =new WebClient();    Stream myStream = myWebClient.OpenRead(url);    StreamReader sr =new StreamReader(myStream, System.Text.Encoding.GetEncoding("utf-8"));    strHTML = sr.ReadToEnd();    myStream.Close();    returnstrHTML; } 

WebRequest 

private string GetWebRequest(stringurl) {     Uri uri =new Uri(url);    WebRequest myReq = WebRequest.Create(uri);    WebResponse result = myReq.GetResponse();    Stream receviceStream = result.GetResponseStream();    StreamReader readerOfStream =new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));    stringstrHTML = readerOfStream.ReadToEnd();     readerOfStream.Close();    receviceStream.Close();    result.Close();    returnstrHTML; } 

HttpWebRequest 

private string GetHttpWebRequest(stringurl) {     Uri uri =new Uri(url);    HttpWebRequest myReq = (HttpWebRequest)WebRequest.Create(uri);    myReq.UserAgent ="User-Agent:Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; .NET CLR 1.0.3705";    myReq.Accept ="*/*";     myReq.KeepAlive =true;     myReq.Headers.Add("Accept-Language","zh-cn,en-us;q=0.5");    HttpWebResponse result = (HttpWebResponse)myReq.GetResponse();    Stream receviceStream = result.GetResponseStream();    StreamReader readerOfStream =new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));    stringstrHTML = readerOfStream.ReadToEnd();     readerOfStream.Close();    receviceStream.Close();    result.Close();    returnstrHTML; } 

 

注意“utf-8”应与指定网页的编码对应。

总结

可以看到HttpWebRequest 方式最复杂，但确提供了更多的选择性。

有的网站检测客户端的UserAgent！如163.com，你如果使用WebClient WebRequest方式获取时，将获取到的是错误提示页面内容。

而通过HttpWebRequest 就没问题。

源码下载：http://files.cnblogs.com/zjfree/GetHTML.rar

测试环境：WIN2003 + VS2005 + C# + winForm