C#使用timer实现的简单闹钟程序

using System;using System.Drawing;using System.Collections;using System.ComponentModel;using System.Windows.Forms;using System.Data;using System.Threading;using System.Timers;using System.IO;using System.Reflection;namespace timerAlarm{  public class TimerForm : System.Windows.Forms.Form  {    //Controls and Components    private System.Windows.Forms.TextBox timerInput;    private System.Windows.Forms.Button StartButton;    private System.Windows.Forms.Button ResetButton;    private System.ComponentModel.IContainer components;    //Timer and associated variables    private System.Timers.Timer timerClock = new System.Timers.Timer();    private int clockTime = 0;    private int alarmTime = 0;    public TimerForm()    {      InitializeComponent();      InitializeTimer();    }    protected override void Dispose( bool disposing )    {      if( disposing )      {        if (components != null)        {          components.Dispose();        }      }      base.Dispose( disposing );    }    #region Windows Form Designer generated code    /// <SUMMARY>    /// Required method for Designer support - do not modify    /// the contents of this method with the code editor.    /// </SUMMARY>    private void InitializeComponent()    {      this.components = new System.ComponentModel.Container();      System.Resources.ResourceManager resources = new System.        Resources.ResourceManager(typeof(TimerForm));      this.timerInput = new System.Windows.Forms.TextBox();      this.StartButton = new System.Windows.Forms.Button();      this.ResetButton = new System.Windows.Forms.Button();      this.SuspendLayout();      //      // timerInput      //      this.timerInput.Location = new System.Drawing.Point(12, 13);      this.timerInput.Name = "timerInput";      this.timerInput.Size = new System.Drawing.Size(50, 20);      this.timerInput.TabIndex = 0;      this.timerInput.Text = "00:00:00";      //      // StartButton      //      this.StartButton.FlatStyle = System.Windows.Forms.        FlatStyle.System;      this.StartButton.Location = new System.Drawing.Point(75, 11);      this.StartButton.Name = "StartButton";      this.StartButton.TabIndex = 1;      this.StartButton.Text = "Start";      this.StartButton.Click += new System.EventHandler        (this.StartButton_Click);      //      // ResetButton      //      this.ResetButton.FlatStyle = System.Windows.Forms.        FlatStyle.System;      this.ResetButton.Location = new System.Drawing.Point(161, 11);      this.ResetButton.Name = "ResetButton";      this.ResetButton.TabIndex = 2;      this.ResetButton.Text = "Reset";      this.ResetButton.Click += new        System.EventHandler(this.ResetButton_Click);      //      // TimerForm      //      this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);      this.ClientSize = new System.Drawing.Size(247, 46);      this.Controls.AddRange(new System.Windows.Forms.Control[] {         this.ResetButton,         this.StartButton,         this.timerInput});      this.FormBorderStyle = System.Windows.Forms.        FormBorderStyle.FixedSingle;      this.Icon = ((System.Drawing.Icon)(resources.        GetObject("$this.Icon")));      this.MaximizeBox = false;      this.Name = "TimerForm";      this.StartPosition = System.Windows.Forms.        FormStartPosition.CenterScreen;      this.Text = "Alarm Timer";      this.Resize += new System.EventHandler(this.        TimerForm_Resized);      this.ResumeLayout(false);    }    #endregion    public void InitializeTimer()    {      this.timerClock.Elapsed += new ElapsedEventHandler(OnTimer);      this.timerClock.Interval = 1000;      this.timerClock.Enabled = true;    }    [STAThread]    static void Main()    {      Application.Run(new TimerForm());    }    private void TimerForm_Resized(object sender, System.EventArgs e)    {      if( this.WindowState == FormWindowState.Minimized )      {        this.Hide();      }    }    private void StartButton_Click(object sender, System.EventArgs e)    {      this.clockTime = 0;      inputToSeconds( this.timerInput.Text );    }    private void ResetButton_Click(object sender, System.EventArgs e)    {      try      {        this.clockTime = 0;        this.alarmTime = 0;        this.timerInput.Text = "00:00:00";      }      catch( Exception ex )      {        MessageBox.Show("ResetButton_Click(): " + ex.Message );      }    }    public void OnTimer(Object source, ElapsedEventArgs e)    {      try      {        this.clockTime++;        int countdown = this.alarmTime - this.clockTime ;        if( this.alarmTime != 0 )        {          this.timerInput.Text = secondsToTime(countdown);        }        //Sound Alarm        if( this.clockTime == this.alarmTime )        {          MessageBox.Show("Play Sound");        }      }      catch( Exception ex )      {        MessageBox.Show("OnTimer(): " + ex.Message );      }        }    private void inputToSeconds( string timerInput )    {      try      {        string[] timeArray = new string[3];        int minutes = 0;        int hours = 0;        int seconds = 0;        int occurence = 0;        int length = 0;        occurence = timerInput.LastIndexOf(":");        length = timerInput.Length;        //Check for invalid input        if( occurence == -1 || length != 8 )        {          MessageBox.Show("Invalid Time Format.");          ResetButton_Click( null, null );        }        else        {          timeArray = timerInput.Split(':');          seconds = Convert.ToInt32( timeArray[2] );          minutes = Convert.ToInt32( timeArray[1] );          hours = Convert.ToInt32( timeArray[0] );          this.alarmTime += seconds;          this.alarmTime += minutes*60;          this.alarmTime += (hours*60)*60;        }      }      catch( Exception e )      {        MessageBox.Show("inputToSeconds(): " + e.Message );      }    }    public string secondsToTime( int seconds )    {      int minutes = 0;      int hours = 0;      while( seconds >= 60 )      {        minutes += 1;        seconds -= 60;      }      while( minutes >= 60 )      {        hours += 1;        minutes -= 60;      }      string strHours = hours.ToString();      string strMinutes = minutes.ToString();      string strSeconds = seconds.ToString();      if( strHours.Length < 2 )        strHours = "0" + strHours;      if( strMinutes.Length < 2 )        strMinutes = "0" + strMinutes;      if( strSeconds.Length < 2 )        strSeconds = "0" + strSeconds;      return strHours + ":" + strMinutes + ":" + strSeconds;    }  }}