一、GET请求

using (var client = new WebClient()){    var responseString = client.DownloadString("http://www.example.com/Test?name=test");}

二、POST请求

using (var client = new WebClient()){    var values = new NameValueCollection();    values["x"] = "106.312859432537";    values["y"] = "29.6603971422907";     var response = client.UploadValues("http://173.12.1.30:7654/baiducoordinate/Coordinates.asmx/baidutowgs84", values);     var responseString = Encoding.Default.GetString(response);}