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?
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