比如有：http://localhost:60527/WebSite1test/Default2.aspx?QueryString1=1&QueryString2=2

Response.Write("
 " + HttpContext.Current.Request.Url.Host);
Response.Write("
 " + HttpContext.Current.Request.Url.Authority);
Response.Write("
 " + HttpContext.Current.Request.Url.Port);
Response.Write("
 " + HttpContext.Current.Request.Url.AbsolutePath);
Response.Write("
 " + HttpContext.Current.Request.ApplicationPath);
Response.Write("
 " + HttpContext.Current.Request.Url.AbsoluteUri);
Response.Write("
 " + HttpContext.Current.Request.Url.PathAndQuery);

结果：

localhost
localhost:60527
60527
/WebSite1test/Default2.aspx
/WebSite1test
http://localhost:60527/WebSite1test/Default2.aspx?QueryString1=1&QueryString1=2
/WebSite1test/Default2.aspx?QueryString1=1&QueryString2=2