C# 计时器写法 - 翾燚
翾燚发表于 2015-10-26 15:42:00
刚才一个交流群里有人问计时器怎么写，正好我也不太熟，就写了个demo，和大家分享一下这个是参考师傅的写的！
计时器有好多种写法，这里给大家推荐一个性能比较好的，用dispatchertimer做的，本demo是倒计时的，计时的将_seconds--改成++就可以了。不多说了，直接上代码。
1.这是界面，简单的xaml
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<TextBlock Name="txt"
HorizontalAlignment="Center"
VerticalAlignment="Center"/>
<Button Margin="0,0,0,50"
Content="开始倒计时"
Background="Red"
Foreground="White"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
Click="Button_Click"/>
</Grid>
<TextBlock Name="txt"
HorizontalAlignment="Center"
VerticalAlignment="Center"/>
<Button Margin="0,0,0,50"
Content="开始倒计时"
Background="Red"
Foreground="White"
HorizontalAlignment="Center"
VerticalAlignment="Bottom"
Click="Button_Click"/>
</Grid>
2.下面是cs代码，用的dispatchertimer,解释下Interval这个属性，它的作用是确定计时间隔，可以用秒、毫秒之类的。还有个Tick委托，该委托是在超过计时间隔时触发的，也就是Interval的时间间隔设置。
public sealed partial class MainPage : Page
{
private DispatcherTimer _countDownTimer;
private int _seconds = 10;
public MainPage()
{
this.InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
this.CountDown();
}
private void CountDown()
{
this._countDownTimer = new DispatcherTimer();
this._countDownTimer.Interval = TimeSpan.FromSeconds(1);
this._countDownTimer.Tick += this._countDownTimer_Tick;
this._countDownTimer.Start();
}
private void _countDownTimer_Tick(object sender, object e)
{
this._seconds--;
this.txt.Text = this._seconds.ToString();
if (this._seconds == 0)
{
this.CountDownStop();
}
}
private void CountDownStop()
{
if (this._countDownTimer != null)
{
this._countDownTimer.Stop();
this._countDownTimer.Tick -= this._countDownTimer_Tick;
this._countDownTimer = null;
}
}
}
{
private DispatcherTimer _countDownTimer;
private int _seconds = 10;
public MainPage()
{
this.InitializeComponent();
}
private void Button_Click(object sender, RoutedEventArgs e)
{
this.CountDown();
}
private void CountDown()
{
this._countDownTimer = new DispatcherTimer();
this._countDownTimer.Interval = TimeSpan.FromSeconds(1);
this._countDownTimer.Tick += this._countDownTimer_Tick;
this._countDownTimer.Start();
}
private void _countDownTimer_Tick(object sender, object e)
{
this._seconds--;
this.txt.Text = this._seconds.ToString();
if (this._seconds == 0)
{
this.CountDownStop();
}
}
private void CountDownStop()
{
if (this._countDownTimer != null)
{
this._countDownTimer.Stop();
this._countDownTimer.Tick -= this._countDownTimer_Tick;
this._countDownTimer = null;
}
}
}
参考别人的写法写的，性能上还是很优异，有更好的写法欢迎评论。
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