WPF C＃ - 定时器倒计时 [英] WPF C# - Timer countdown

问题描述

我如何能实现我的一段代码写在WPF C＃以下？

How can I implement the following in my piece of code written in WPF C#?

我有我已经实现了一个SelectionChanged事件而（由ElementFlow控制。定义）触发了在控件的项目选择已经改变了特定的事件

I have a ElementFlow control in which I have implemented a SelectionChanged event which (by definition) fires up a specific event when the control's item selection has changed.

我想什么它做的是：

1. 启动例如一个计时器


2. 如果定时器达到2秒钟，然后推出一个消息说（你好）


3. 如果定时器之前选择的变化达到2秒钟，然后定时器应清零，重新开始了。

这是保证，如果选择没有在2秒内改变，但我不熟悉WPF的DispatcherTimer功能，因为我更了解内情，当涉及到Windows窗体的正常定时器冗长的操作仅启动。

This is to ensure that the lengthy action only launches if the selection has not changed within 2 seconds but I am not familiar with the DispatcherTimer feature of WPF as i am more in the know when it comes to the normal Timer of Windows Forms.

谢谢，

秒。

推荐答案

感谢您的帮助，我已经想通了完整代码了这样：

Thanks to your help, I've figured the complete code out as such:

DispatcherTimer _timer;

public MainWindow()
{
    _myTimer = new DispatcherTimer();
    _myTimer.Tick += MyTimerTick;
    _myTimer.Interval = new TimeSpan(0,0,0,1);
}

private void ElementFlowSelectionChanged(object sender, SelectionChangedEventArgs e)
{
    _counter = 0;
    _myTimer.Stop();
    _myTimer.Interval = new TimeSpan(0, 0, 0, 1);
    _myTimer.Start();
}

private int _counter;
public int Counter
{
    get { return _counter; }
    set
        {
            _counter = value;
            OnPropertyChanged("Counter");
        }
}
private void MyTimerTick(object sender, EventArgs e)
{
    Counter++;
    if (Counter == 2)
    {
        _myTimer.Stop();
        MessageBox.Show("Reached the 2 second countdown");
    }
}
public event PropertyChangedEventHandler PropertyChanged;
protected virtual void OnPropertyChanged(string propertyName)
{
    PropertyChangedEventHandler e = PropertyChanged;
    if (e != null)
        {
            e(this, new PropertyChangedEventArgs(propertyName));
}
        }

非常感谢你！

Thank you very much!!!

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