如果调用WebService的不是在.NET中，无法直接添加web引用，那怎么调用webservice。

有两种方式

第一种方式：GET方式

string strUrl = "?topNum=2"; HttpWebRequest hwrq = (HttpWebRequest)WebRequest.Create(strUrl); hwrq.Method = "GET"; HttpWebResponse hwrp = (HttpWebResponse)hwrq.GetResponse(); Stream stream = hwrp.GetResponseStream(); XmlDocument doc = new XmlDocument(); doc.Load(stream); string strLine = ""; XmlNodeList list = doc.GetElementsByTagName("Table"); for (int i = 0; i < list.Count; i++) { XmlNodeList chlist = list[i].ChildNodes; for (int j = 0; j < chlist.Count; j++) { strLine = strLine + chlist[j].Name + "\t" + chlist[j].InnerText + "\n"; } strLine = strLine + "\n"; } StreamWriter sw = new StreamWriter(@"c:/c.txt"); sw.WriteLine(strLine); sw.Flush(); sw.Close();

第二种方式：POST方式

string strUrl = ""; HttpWebRequest hwrq = (HttpWebRequest)WebRequest.Create(strUrl); hwrq.Method = "POST"; hwrq.ContentType = "application/x-www-form-urlencoded"; String param1 = HttpUtility.UrlEncode("topNum"); param1 += "=" + HttpUtility.UrlEncode("5"); byte[] bt = Encoding.UTF8.GetBytes(param1); hwrq.ContentLength = bt.Length; Stream sw = hwrq.GetRequestStream(); sw.Write(bt, 0, bt.Length); sw.Close(); HttpWebResponse hwrp = (HttpWebResponse)hwrq.GetResponse(); Stream stream = hwrp.GetResponseStream(); XmlDocument xmldoc = new XmlDocument(); xmldoc.Load(stream); XmlNodeList list = xmldoc.GetElementsByTagName("Table"); string strLine = ""; for (int i = 0; i < list.Count; i++) { XmlNodeList chlist = list[i].ChildNodes; for (int j = 0; j < chlist.Count; j++) { strLine = strLine + chlist[j].Name + "\t" + chlist[j].InnerText + "\n"; } strLine = strLine + "\n"; } StreamWriter writer = new StreamWriter(@"c:\c.txt"); writer.WriteLine(strLine); writer.Flush(); sw.Close();

get方式与post方式的主要区别在于post方式的参数要经过url编码，并在获得请求之前传送。

post的方式的参数一定要以实例中方式来写，否则会出现HTTP请求500错误。

string param1 = HttpUtility.UrlEncode("topNum");

param1+="="+HttpUtility.UrlEncode("5");

发送Http请求调用webService