根据IP获取国家

public string Ip2Country(string ip)
{
try
{
string url = "http://api.ipinfodb.com/v3/ip-country/?key=<your key,should regist first>&ip=" + ip;
string rst = HttpCrossDomain.Get(url,10000);
if (rst.Split(';').Count() >= 4)
rst = rst.Split(';')[3];
else
rst = "";
return rst;
}
catch
{
return "ERROR";
}
}

/// <summary>
/// 跨域访问
/// </summary>
/// <param name="url"></param>
/// <param name="param"></param>
/// <returns></returns>
public static string Get(string url, int time = 60000)
{
Uri address = new Uri(url);
HttpWebRequest request = WebRequest.Create(address) as HttpWebRequest;
request.Method = "GET";
request.ContentType = "application/json;charset=utf-8"; //"application/x-www-form-urlencoded";
request.Timeout = time;
string result = "";
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
StreamReader reader = new StreamReader(response.GetResponseStream());
result = reader.ReadToEnd();
}
return (result);
}