用C#做个简单的计时器（秒表功能）

        先在窗口中加入一个计时器控件：（timer1）用于触发计时；一个Label控件：（bable1）用于显示时间；两个按钮：（btnStar）用于开始／停止计时，（btnClear）用于计时器清零。

        声明一个整型变量：t，用于获取毫秒，然后在窗口代码中加入以下代码：

        
        private int t = 0;
                
        void MainFormLoad(object sender, System.EventArgs e)
        {
            this.timer1.Enabled = false;
            this.timer1.Interval = 1;
        }
            
        //计时函数
        public string GetAllTime(int time)   
          {
            string hh, mm, ss, fff;
                
              int f = time%100; // 毫秒   
            int s = time/100; // 转化为秒
            int m = s/60;     // 分
            int h = m/60;     // 时
                  s = s%60;     // 秒 
        
                  //毫秒格式00
                  if(f<10)
                  {
                      fff = "0" + f.ToString();
                  }
                  else
                  {
                      fff = f.ToString();
                  }
                  
                  //秒格式00
                  if(s<10)
                  {
                      ss = "0" + s.ToString();
                  }
                  else
                  {
                      ss =  s.ToString();
                  }
                  
                  //分格式00
                  if(m<10)
                  {
                      mm = "0" + m.ToString();
                  }
                  else
                  {
                      mm = m.ToString();
                  }
                  
                  //时格式00
                  if(h<10)
                  {
                      hh = "0" + h.ToString();
                  }
                  else
                  {
                      hh = h.ToString();
                  }
              
              //返回 hh:mm:ss.ff            
              return hh + ":" + mm + ":" + ss + "." + fff;
          }
        
        //开始计时按钮单击事件
        void BtnOKClick(object sender, System.EventArgs e)
        {
            if(timer1.Enabled == false)
            {
                this.btnOK.Text = "停止计时";
                this.timer1.Enabled = true;
            }
            else
            {
                this.btnOK.Text = "开始计时";
                this.timer1.Enabled = false;
            }
        }
    
        //时钟控件事件
        void Timer1Tick(object sender, System.EventArgs e)
        {            
            t = t + 1;//得到总的毫秒数   
              this.label1.Text = GetAllTime(t);
        }
    
        //计时器清零
        void BtnClearClick(object sender, System.EventArgs e)
        {
            t = 0;
            //如何正在计时，则先停止再清零，否则直接清零
            if(this.timer1.Enabled == true)
            {
                this.BtnOKClick(sender,e);
                label1.Text = GetAllTime(t);
            }
            else
            {
                label1.Text = GetAllTime(t);
            }
            
        }