关于使用计时器控件(Timer)的问题

Question

定义了一个计时器控件，两个按钮，一个listview
点击启动按钮时，每秒在listview中显示一项，点击停止按钮时停止计时器功能。可是当我再次点击开始按钮时，每秒钟在listview显示两项，不知道为什么，如果在停止后，开始，每秒钟就会显示三项，依次类推，private static int a = 1;
        ListViewItem lvItem = null;
        ListViewItem.ListViewSubItem lvsItem = null;   private void timer1_Tick(object sender, EventArgs e)
        {
            a++;
            lvItem = new ListViewItem(a.ToString());            lvsItem = new ListViewItem.ListViewSubItem();
            lvsItem.Text = a.ToString();
            lvItem.SubItems.Add(lvsItem);            this.listView1.Items.Add(lvItem);        }        private void button1_Click(object sender, EventArgs e)
        {
            this.timer1.Tick += new EventHandler(timer1_Tick);            this.timer1.Interval = 1000;
            this.timer1.Start();
        }        private void button2_Click(object sender, EventArgs e)
        {
            this.timer1.Stop();
        }

Answer 1

this.timer1.Tick   +=   new   EventHandler(timer1_Tick); 
这一句使你的程序每次点击button1之后都要多执行一次timer1_Tick()方法

Answer 2

private   void   button1_Click(object   sender,   EventArgs   e) 
                { 
                        this.timer1.Tick   +=   new   EventHandler(timer1_Tick);                         this.timer1.Interval   =   1000; 
                        this.timer1.Start(); 
                } 
太麻烦了吧
private   void   button1_Click(object   sender,   EventArgs   e) 
                { 
                       this.timer1.Interval=1000;
                       this.timer1.Enable=true;
                } private   void   button2_Click(object   sender,   EventArgs   e) 
                { 
                        this.timer1.Enable=false;
                }
就可以了
不需要每次都重叠添加事件.

Answer 3

不需要在按钮事件下添加事件,在Load事件或者在Initial里面this.timer1.Tick  +=   new  EventHandler(timer1_Tick);   

Answer 4

this.timer1.Tick += new EventHandler(timer1_Tick);
不要放在button1_Click内。+=会使timer1_Tick“delegate”多个Tick事件，使timer1_Tick同时多次触发。@_@ 我刚回答了这个帖子。
http://topic.csdn.net/u/20080113/21/719ddab2-6539-48b5-9f43-56bbcae8a19a.html

Answer 5

InitializeComponent()方法里
this.timer1.Interval=1000; 
this.timer1.Enable=false; 
this.timer1.Tick+=new EventHandler(timer1_Tick);  private       void       button1_Click(object       sender,       EventArgs       e)   
                                {   
                                              this.timer1.Enable=true; 
                                }   private       void       button2_Click(object       sender,       EventArgs       e)   
                                {   
                                                this.timer1.Enable=false; 
                                } 

Answer 6

this.timer1.Tick   +=   new   EventHandler(timer1_Tick); 
会触发 timer1_Tick(object   sender,   EventArgs   e) 
当然会多了，楼上均有解，不多语！

Answer 7

每点击一次按钮你就new一个时间控件，但然就会多显示一个。
如下修改代码即可private       void       button1_Click(object       sender,       EventArgs       e)   
                                {   
                                              this.timer1.Interval=1000; 
                                              this.timer1.Enable=true; 
                                }   private       void       button2_Click(object       sender,       EventArgs       e)   
                                {   
                                                this.timer1.Enable=false; 
                                }