WinForm-WebClient 类的公共方法

 1 ///获得外网IP地址，由于学校是在局域网。所以比较麻烦
 2 private static string GetIPAddress()
 3 {
 4     string tempip = "";
 5     try
 6         {
 7              WebRequest wr = WebRequest.Create("http://www.ip138.com/ip2city.asp");
 8                 Stream s = wr.GetResponse().GetResponseStream();
 9                 StreamReader sr = new StreamReader(s, Encoding.Default);
10                 string all = sr.ReadToEnd(); //读取网站的数据
11 
12                 int start = all.IndexOf("[") + 1;
13                 int end = all.IndexOf("]", start);
14                 tempip = all.Substring(start, end - start);
15                 sr.Close();
16                 s.Close();
17     }
18     catch
19     {
20     }
21     return tempip;
22 }

 1 ///根据获得的外网IP 从而获得IP归属地信息
 2 public void ThreadProc(string ip)
 3         {
 4             if (!IsVaildIPAddress(ip))
 5             {
 6                 MessageBox.Show("Illegal", "Error", MessageBoxButtons.OK,
 7         MessageBoxIcon.Error);
 8             }
 9             WebClient client = new WebClient();
10             string uri = @"http://ip.taobao.com/service/getIpInfo.php?ip=" + ip;
11             string jsonData = client.DownloadString(uri);
　　　　　　　　　//下面语句需要引用Json.dll
12             IPCheckResult result = JsonConvert.DeserializeObject<IPCheckResult>
13         (jsonData);
14             if (result.code != 0)
15             {
16                 MessageBox.Show("Not Found");
17             }
18             textBox1.Text = result.data.Region;
19             textBox2.Text = result.data.City;
20             textBox3.Text = result.data.Country + result.data.ISP;
21             textBox4.Text = result.data.Area + "地区";
22         }

///用正则表达式 验证IP
private bool IsVaildIPAddress(string ip)
        {
            string pattern = @"^((?:(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d)))\.){3}(?:25[0-5]|2[0-4]\d|((1\d{2})|([1-9]?\d))))$";
            return Regex.IsMatch(ip, pattern);
        }

///Form_Load事件调用
1  private void Form1_Load(object sender, EventArgs e)
2         {
3             string ip = GetIPAddress();
4             Thread thread = new Thread(() => ThreadProc(ip));
　　　　　　　　//始终觉得 Lamda表达式是线程调用有参数的函数的好办法。。。。
5             thread.Start();
6         }

 1 namespace IPAddress
 2 {
 3     class IPAddressData
 4     {
 5         public string Country;//获取IP所在城市
 6         public string Area;//获取IP所在地区
 7         public string Region;//获取IP所在省
 8         public string City;//获取IP所在市
 9         public string ISP;//获取IP所属运营商
10         public IPAddressData()
11         { }
12     }
13 }

1 namespace IPAddress
2 {
3     class IPCheckResult
4     {
5         public int code;
6         public IPAddressData data;
7     }
8 }