中文XML论坛--C# Timer范例教程

贴子主题： C# Timer范例教程

本主题类别:

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
#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;
        }
    }
}

实际的执行代码比上面的要多，本范例演示了Timer在实际环境中的一个简单应用，仅仅使用了一些简单的基础知识来创建一个简单的应用。


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