域名是否正常，网站是否可以正常访问是很头痛的问题，怎样简单地监控域名是否可以正常访问呢，这里发布一款域名监控小工具：Domain(IP)Watcher
功能：
监控给定的域名，一旦域名连续30秒(这是默认值，可以在源码中修改)无法Ping通，立刻发邮件到指定邮箱，并发短信给站长
效果图：
正常情况
异常情况
邮件
短信
原理：
用后台线程循环每隔5秒钟Ping结定的域名，如果连接5次Ping不通则发送邮件到给定邮箱。发短信是通过其他途径实现的，现在最常用的有两种方式：
一是利用QQ邮箱的手机绑定功能实现收到邮件短信提示
二是用www.ifttt.com提供的gmail跟sms服务实现收到邮件发短信提示
本工具用的是第一种。
主要程序：
主要是后台线程ping域名的应用，界面上显示记录的是一个richtextbox控件，其他几个就不说了，代码如下：
窗体后台程序：
1 public partial class FormMain : Form, IFormWorkThread 2 { 3 private delegate void ControlDelegate(string record); 4 private WorkThread wtObj; 5 ControlDelegate cdObj; 6 7 public FormMain() 8 { 9 InitializeComponent(); 10 cdObj = SetRecord; 11 } 12 13 private void FormMain_Load(object sender, EventArgs e) 14 { 15 } 16 17 private void btnBegin_Click(object sender, EventArgs e) 18 { 19 if (txtDomain.Text.Trim() == "") 20 { 21 MessageBox.Show("Domain(IP) can not be empty!"); 22 return; 23 } 24 if (txtEmail.Text.Trim() == "") 25 { 26 MessageBox.Show("Email address can not be empty!"); 27 return; 28 } 29 Regex regex = new Regex(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*"); 30 if (!regex.IsMatch(txtEmail.Text.Trim())) 31 { 32 MessageBox.Show("Email address error!"); 33 return; 34 } 35 wtObj = new WorkThread(this, 0, 3, txtDomain.Text.Trim(), txtEmail.Text.Trim()); 36 wtObj.StartShowResult(); 37 } 38 39 private void SetRecord(string record) 40 { 41 rtxtRecord.AppendText(record); 42 if (rtxtRecord.Lines.Length > 5 * 60 * 24 * 7) 43 { 44 rtxtRecord.Clear(); 45 } 46 } 47 48 public void ShowResult(string record) 49 { 50 51 if (rtxtRecord.InvokeRequired) 52 { 53 Invoke(cdObj, record); 54 } 55 else 56 { 57 SetRecord(record); 58 } 59 } 60 61 private void btnEnd_Click(object sender, EventArgs e) 62 { 63 if (wtObj != null) 64 { 65 wtObj.EndShowResult(); 66 } 67 } 68 69 private void FormMain_FormClosing(object sender, FormClosingEventArgs e) 70 { 71 if (wtObj != null) 72 { 73 wtObj.EndShowResult(); 74 } 75 } 76 77 private void tslblName_Click(object sender, EventArgs e) 78 { 79 OpenMyBlog(); 80 } 81 82 private void OpenMyBlog() 83 { 84 var Info = new System.Diagnostics.ProcessStartInfo("http://artwl.cnblogs.com"); 85 System.Diagnostics.Process.Start(Info); 86 } 87 } IFormWorkThread接口：
1 public interface IFormWorkThread 2 { 3 void ShowResult(string record); 4 } WorkThread代码：
1 public class WorkThread 2 { 3 private IFormWorkThread _formWorkThread; 4 private Thread thread; 5 private int count = 0, maxcount = 5; 6 private string domain = ""; 7 private string emailaddress = ""; 8 9 public WorkThread(IFormWorkThread formWorkThread,int count,int maxcount,string domain,string email) 10 { 11 this.count = count; 12 this.maxcount = maxcount; 13 this.domain = domain; 14 this.emailaddress = email; 15 _formWorkThread = formWorkThread; 16 } 17 18 private string Ping(string domainname) 19 { 20 Ping ping = new Ping(); 21 PingReply pr = ping.Send(domainname); 22 if (pr.Status == IPStatus.Success) 23 { 24 count = count > 0 ? count - 1 : 0; 25 } 26 else 27 { 28 count++; 29 if (count > maxcount) 30 { 31 EmailHelp.SendEmail(emailaddress, 32 string.Format("【 {0} 】不能访问啦！",domainname), 33 string.Format("【 {0} 】不能访问啦！【时间】{1}【Ping】当前ping的结果为：{2}", domainname,DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), pr.Status), 34 true); 35 count = 0; 36 } 37 } 38 return "【Time】:" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + "\t【Domain】:" + domainname + "\t【Status】:" + pr.Status.ToString() + "\t【RoundtripTime】:" + pr.RoundtripTime.ToString() + "\n"; 39 } 40 41 public void Deal() 42 { 43 while (true) 44 { 45 Thread.Sleep(5000); 46 string result = Ping(domain); 47 _formWorkThread.ShowResult(result); 48 } 49 } 50 51 public void StartShowResult() 52 { 53 thread = new Thread(new ThreadStart(Deal)); 54 thread.Name = "TimeThread"; 55 thread.Start(); 56 } 57 58 public void EndShowResult() 59 { 60 thread.Abort(); 61 } 62 } 发邮件代码：
1 public class EmailHelp 2 { 3 public static void SendEmail(string[] emailAddress, string subject, string body, bool ishtml) 4 { 5 MailMessage msg = new MailMessage(); 6 foreach (string o in emailAddress) 7 { 8 msg.To.Add(o); 9 } 10 11 msg.Subject = subject;//邮件标题 12 msg.Body = body;//邮件内容 13 msg.IsBodyHtml = ishtml;//是否是HTML邮件 14 15 Thread sendemail = new Thread(SendReplyEmail); 16 sendemail.Start(msg); 17 } 18 19 public static void SendEmail(string to, string subject, string body, bool ishtml) 20 { 21 SendEmail(new string[] { to }, subject, body, ishtml); 22 } 23 24 private static void SendEmail(MailMessage mailMessage) 25 { 26 mailMessage.From = new MailAddress("emailaddress", "网站检测邮件", System.Text.Encoding.UTF8); 27 mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题编码 28 mailMessage.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码 29 mailMessage.Priority = MailPriority.Normal;//邮件优先级 30 SmtpClient client = new SmtpClient(); 31 32 //注册的邮箱和密码 33 client.Credentials = new System.Net.NetworkCredential("emailaddress", "password"); 34 client.Port = 25; 35 client.Host = "smtp.qq.com"; 36 client.EnableSsl = false; 37 try 38 { 39 client.Send(mailMessage); 40 } 41 catch (System.Net.Mail.SmtpException ex) 42 { 43 //log.Error(ex.Message); 44 } 45 } 46 47 private static void SendReplyEmail(object model) 48 { 49 SendEmail((MailMessage)model); 50 } 51 } 注：发邮件的代码中emailaddress跟password要换成你自己的邮件地址跟密码。另外下载的exe文件为保证可用，我用的邮箱地址跟密码没有去掉，请大家也不要反编译后查看（这只是一个coding时的测试邮箱，没什么价值，赚不到钱的）。
工具下载地址：
（至少要安装.net Framework 2.0）