用C#做個簡單的計時器（秒錶功能）

        先在視窗中加入一個計時器控制項：（timer1）用於觸發計時；一個Label控制項：（bable1）用於顯示時間；兩個按鈕：（btnStar）用於開始／停止計時，（btnClear）用於計時器清零。

        聲明一個整型變數：t，用於擷取毫秒，然後在視窗代碼中加入以下代碼：

        
        private int t = 0;
                
        void MainFormLoad(object sender, System.EventArgs e)
        {
            this.timer1.Enabled = false;
            this.timer1.Interval = 1;
        }
            
        //計時函數
        public string GetAllTime(int time)   
          {
            string hh, mm, ss, fff;
                
              int f = time%100; // 毫秒   
            int s = time/100; // 轉化為秒
            int m = s/60;     // 分
            int h = m/60;     // 時
                  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();
                  }
                  
                  //時格式00
                  if(h<10)
                  {
                      hh = "0" + h.ToString();
                  }
                  else
                  {
                      hh = h.ToString();
                  }
              
              //返回 hh:mm:ss.ff            
              return hh + ":" + mm + ":" + ss + "." + fff;
          }
        
        //開始計時按鈕單擊事件
        void BtnOKClick(object sender, System.EventArgs e)
        {
            if(timer1.Enabled == false)
            {
                this.btnOK.Text = "停止計時";
                this.timer1.Enabled = true;
            }
            else
            {
                this.btnOK.Text = "開始計時";
                this.timer1.Enabled = false;
            }
        }
    
        //時鐘控制項事件
        void Timer1Tick(object sender, System.EventArgs e)
        {            
            t = t + 1;//得到總的毫秒數   
              this.label1.Text = GetAllTime(t);
        }
    
        //計時器清零
        void BtnClearClick(object sender, System.EventArgs e)
        {
            t = 0;
            //如何正在計時，則先停止再清零，否則直接清零
            if(this.timer1.Enabled == true)
            {
                this.BtnOKClick(sender,e);
                label1.Text = GetAllTime(t);
            }
            else
            {
                label1.Text = GetAllTime(t);
            }
            
        }