c# 获取网页源码

Posted 2020-07-06 260250932

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; }

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; }

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();     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：http://files.cnblogs.com/zjfree/GetHTML.rar

测试环境：WIN2003 + VS2005 + C# + winForm

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