HttpWebRequest的GET和POST方法

string url = "http://www.webxml.com.cn/WebServices/WeatherWS.asmx/";
            string postMethod = "getSupportCityDataset";//方法名
            string postDataName = "theRegionCode";//参数名
            string postDataValue = "3118";//参数值
            string recstr= HttpGet(url,postMethod,postDataName,postDataValue);

public string HttpGet(string Url, string postMethod,string postDataName, string postDataValue)
        {
            if (postMethod.Length>0)
            {
                Url += postMethod;
            }
            if (postDataName.Length>0)
            {
                Url += "?" + postDataName;
            }
            if (postDataValue.Length>0)
            {
                Url += "=" + postDataValue;
            }
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(Url);
            request.Method = "GET";
            request.ContentType = "text/html;charset=UTF-8";
            request.Timeout = 10000;

            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            Stream myResponseStream = response.GetResponseStream();
            StreamReader myStreamReader = new StreamReader(myResponseStream, Encoding.GetEncoding("utf-8"));
            string retString = myStreamReader.ReadToEnd();
            myStreamReader.Close();
            myResponseStream.Close();
            return retString;
        }