C#使用timer实现的简单闹钟程序

本文实例讲述了c#使用timer实现的简单闹钟程序。分享给大家供大家参考。具体如下：

当我在电脑上工作，我经常会被一些东西吸引，比如某宝，结果三个小时过去了我都完全没有注意到。所以我通过c#做了一个简单闹钟程序，这个小程序主要使用c# timer对象，让用户设定一个倒计时的时长，如果时间到了，就播放一个wav音频文件（也就是闹铃）。

我一直试图保持这个timer的简单性，但我还是添加了一些额外的功能，在状态栏中显示一个通知图标。
通过这个小应用你也可以了解到c#中timer定时器的一些简单用法。

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;
    }
  }
}

完整实例代码点击此处本站下载。

希望本文所述对大家的c#程序设计有所帮助。