如何根据URL得到域名？

Question

例如www.163.com
    user.bolg.163.com
  
  用URI可以根据URL得到上述HOST，但我只要域名部分。即上述要求返回163.com如何得到？

Answer 1

string mystring = "user.bolg.163.com";
int i = mystring.LastIndexOf('.', (mystring.LastIndexOf(".") - 1));
Response.Write(mystring.Substring(i+1));ystring = "bolg.163.com";
i = mystring.LastIndexOf('.', (mystring.LastIndexOf(".") - 1));
Response.Write(mystring.Substring(i+1));

Answer 2

HttpContext.Current.Request.UrlRequest.ServerVariables["HTTP_HOST"] + Request.ServerVariables["SCRIPT_NAME"]
Request.ApplicationPath: /testweb
Request.CurrentExecutionFilePath: /testweb/default.aspx
Request.FilePath: /testweb/default.aspx
Request.Path: /testweb/default.aspx
Request.PathInfo:
Request.PhysicalApplicationPath: E:\WWW\testweb\
Request.PhysicalPath: E:\WWW\testweb\default.aspx
Request.RawUrl: /testweb/default.aspx
Request.Url.AbsolutePath: /testweb/default.aspx
Request.Url.AbsoluteUri: http://www.test.com/testweb/default.aspx
Request.Url.Host: www.test.com
Request.Url.LocalPath: /testweb/default.aspx

Answer 3

刚忘记写了string mystring = Request.ServerVariables["HTTP_HOST"].ToString(); 
int i = mystring.LastIndexOf('.', (mystring.LastIndexOf(".") - 1)); 
Response.Write(mystring.Substring(i+1)); 

Answer 4

 Request.Url.Host.ToString().Replace("wwww.","")

Answer 5

http://topic.csdn.net/u/20091108/11/93fa8e97-3e24-4768-b68d-6884a89ac13f.html