1   private Dictionary<string, Object> GetLocation(string imei)
 2         {
 3             #region===代码===
 4             string serviceAddress = string.Format("http://localhost/api/car/getlastinfo?imei={0}&key=xxxxx",imei);
 5             HttpWebRequest req = (HttpWebRequest)WebRequest.Create(serviceAddress);
 6             req.Method = "get";
 7             req.KeepAlive = false;  
 8             var resp = new StreamReader(((HttpWebResponse)req.GetResponse()).GetResponseStream(), Encoding.GetEncoding("utf-8"));
 9             string res = resp.ReadToEnd();
10             resp.Close();
11             Dictionary<string, Object> dic = null;
12             if (res != "")
13             {
14                 dic = JsonConvert.DeserializeObject<Dictionary<string, Object>>(res);
15             }
16             return dic;
17             #endregion===代码===
18         }

解决：设置  req.KeepAlive = false;