C# 根据IP地址获取城市

 1 using System;
 2 using System.IO;
 3 using System.Net;
 4 using System.Text;
 5 using System.Web.Script.Serialization;
 6 
 7 namespace IpUtils
 8 {
 9     public class IpDetail
10     {
11         public String Ret { get; set; }
12 
13         public String Start { get; set; }
14 
15         public String End { get; set; }
16 
17         public String Country { get; set; }
18 
19         public String Province { get; set; }
20 
21         public String City { get; set; }
22 
23         public String District { get; set; }
24 
25         public String Isp { get; set; }
26 
27         public String Type { get; set; }
28 
29         public String Desc { get; set; }
30     }
31 
32     public class IpHelper
33     {
34         /// <summary>
35         /// 获取IP地址的详细信息，调用的借口为
36         /// http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip={ip}
37         /// </summary>
38         /// <param name="ipAddress">请求分析得IP地址</param>
39         /// <param name="sourceEncoding">服务器返回的编码类型</param>
40         /// <returns>IpUtils.IpDetail</returns>
41         public static IpDetail Get(String ipAddress,Encoding sourceEncoding)
42         {
43             String ip = string.Empty;
44             if(sourceEncoding==null)
45                 sourceEncoding = Encoding.UTF8;
46             using (var receiveStream = WebRequest.Create("http://int.dpool.sina.com.cn/iplookup/iplookup.php?format=json&ip="+ipAddress).GetResponse().GetResponseStream())
47             {
48                 using (var sr = new StreamReader(receiveStream, sourceEncoding))
49                 {
50                     var readbuffer = new char[256];
51                     int n = sr.Read(readbuffer, 0, readbuffer.Length);
52                     int realLen = 0;
53                     while (n > 0)
54                     {
55                         realLen = n;
56                         n = sr.Read(readbuffer, 0, readbuffer.Length);
57                     }
58                     ip = sourceEncoding.GetString(sourceEncoding.GetBytes(readbuffer, 0, realLen));
59                 }
60             }
61             return  !string.IsNullOrEmpty(ip)?new JavaScriptSerializer().Deserialize<IpDetail>(ip):null;
62         }
63     }
64 
65     public class EncodingHelper
66     {
67         public static String GetString(Encoding source, Encoding dest, String soureStr)
68         {
69             return dest.GetString(Encoding.Convert(source, dest, source.GetBytes(soureStr)));
70         }
71 
72         public static String GetString(Encoding source, Encoding dest, Char[] soureCharArr, int offset, int len)
73         {
74             return dest.GetString(Encoding.Convert(source, dest, source.GetBytes(soureCharArr, offset, len)));
75         }
76     }
77 }
IpHelper
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