如何为Progress Bar(初学者)举办活动

时间:2013-09-14 16:22:07

标签: c#

我想在ProgressBar为0或100时举起一个事件,但是尽管我努力了,我还没有在ProgressBar Events for Value Property中找到这样的事件,我想知道如何自己实现这样的事件?

我在哪里宣布此类活动?

1 个答案:

答案 0 :(得分:2)

ProgressBar只是indicator,因此它不支持某些ValueChanged事件。但是,您可以自定义它以支持此类事件和其他类似事件:

    public class CustomProgressBar : ProgressBar
    {
        public event EventHandler ReachedMinimum;
        public event EventHandler ReachedMaximum;
        public event EventHandler ValueChanged;            
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);
            if (m.Msg == 0x402)//PBM_SETPOS = WM_USER + 2
            {     
               EventHandler handler = ValueChanged;
               if(handler != null) handler(this, EventArgs.Empty);
               handler = ReachedMinimum;                    
               if (Value == Minimum && handler!=null) handler(this, EventArgs.Empty);
               handler = ReachedMaximum;
               if (Value == Maximum && handler != null) handler(this, EventArgs.Empty);
            } 
        }
    }
    //Use it
    customProgressBar1.ReachedMaximum += (s,e) => {
          MessageBox.Show("Reached maximum!");
    };
    //... the same for other events