Asp.net c # three methods to obtain webpage source code

C # you can use WebClient WebRequest HttpWebRequest to obtain the original HTML code of a specified webpage.
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;
}
Note that "UTF-8" should correspond to the encoding of the specified webpage.
Summary
We can see that the HttpWebRequest method is the most complex, but it does provide more options.