C#使用百度API通过IP获取地理位置和坐标

百度接口相关说明：http://developer.baidu.com/map/ip-location-api.htm

返回是json格式，首先构建相关反系列化类：

 #region AddressForQueryIPFromBaidu
 [Serializable]
 public class AddressForQueryIPFromBaidu
 {
     public string Address { get; set; }
     public Content Content { get; set; }
     public string Status { get; set; }
 }
 [Serializable]
 public class Content
 {
     public string Address { get; set; }
     public Address_Detail Address_Detail { get; set; }
     public Point Point { get; set; }
 }
 [Serializable]
 public class Address_Detail
 {
     public string City { get; set; }
     public string City_Code { get; set; }
     public string District { get; set; }
     public string Province { get; set; }
     public string Street { get; set; }
     public string Street_Number { get; set; }
 }
 [Serializable]
 public class Point
 {
     public string X { get; set; }
     public string Y { get; set; }
 }
 #endregion

接口调用方法：

 public static AddressForQueryIPFromBaidu GetAddressFromIP(string ipAddress)
 {
     string baiduKey = "59722ea6a425fbd81******80ee3ecbb";
     string url = "http://api.map.baidu.com/location/ip?ak="+baiduKey+"&ip="+ipAddress+"&coor=bd09ll";
     HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
     HttpWebResponse response = (HttpWebResponse)request.GetResponse();
     System.IO.Stream responseStream = response.GetResponseStream();
     System.IO.StreamReader sr = new System.IO.StreamReader(responseStream, System.Text.Encoding.GetEncoding("utf-8"));
     string responseText = sr.ReadToEnd();
     sr.Close();
     sr.Dispose();
     responseStream.Close();
     string jsonData = responseText;
     JavaScriptSerializer jss = new JavaScriptSerializer();
     AddressForQueryIPFromBaidu addressForQueryIPFromBaidu = jss.Deserialize<AddressForQueryIPFromBaidu>(jsonData);
     return addressForQueryIPFromBaidu;
 }