C# 获取网页源代码

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(string url)

{

string strHTML = "";

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();

return strHTML;

}

private string GetWebClient(string url)

{

string strHTML = "";

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();

return strHTML;

}

WebRequest 

private string GetWebRequest(string url)

{

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"));

string strHTML = readerOfStream.ReadToEnd();

readerOfStream.Close();

receviceStream.Close();

result.Close();

return strHTML;

}

private string GetWebRequest(string url)

{

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"));

string strHTML = readerOfStream.ReadToEnd();

readerOfStream.Close();

receviceStream.Close();

result.Close();

return strHTML;

}

HttpWebRequest 

private string GetHttpWebRequest(string url)

{

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();

//www.elivn.com

StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));

string strHTML = readerOfStream.ReadToEnd();

readerOfStream.Close();

receviceStream.Close();

result.Close();

return strHTML;

}

StreamReader readerOfStream = new StreamReader(receviceStream, System.Text.Encoding.GetEncoding("utf-8"));

string strHTML = readerOfStream.ReadToEnd();

readerOfStream.Close();

receviceStream.Close();

result.Close();

return strHTML;

}

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

测试环境：WIN2003 + VS2005 + C# + winForm