WPF使用Timer实现计时器

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   <Window x:Class="time2.MainWindow"
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   xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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   xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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   xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
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   xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
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   xmlns:local="clr-namespace:time2"
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   mc:Ignorable="d"
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   Title="MainWindow" Height="450" Width="800">
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   <Grid>
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    <Label Name="Label_OtherResult" HorizontalAlignment="Left" Margin="0,28,0,0" VerticalAlignment="Top" Height="300" Width="800" FontSize="120" HorizontalContentAlignment="Center" VerticalContentAlignment="Center" Background="CadetBlue" FontWeight="Bold"/>
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    <Button Content="开始" HorizontalAlignment="Left" Margin="197,359,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click_1" />
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    <Button Content="结束" HorizontalAlignment="Left" Margin="509,359,0,0" VerticalAlignment="Top" Click="Button_Click" Width="75"/>
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    </Grid>
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    </Window>

上面是界面代码，布局比较简单，没有太多的花里胡哨

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   public partial class MainWindow : Window
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   {
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   System.Timers.Timer timer;
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   public MainWindow()
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   {
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   InitializeComponent();
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   if (timer == null)
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   {
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   timer = new System.Timers.Timer();
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    timer.Interval = 1;
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    timer.Elapsed = timer_Elapsed;
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    }
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    }
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    void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
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    {
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    this.Dispatcher.BeginInvoke(new Action(() =>
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    {
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    this.Label_OtherResult.Content = DateTime.Now.ToString("%H:mm:s:fff");
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    }), null);
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    }
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    private void Button_Click_1(object sender, RoutedEventArgs e)
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    {
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    timer.Start();
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    }
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    private void Button_Click(object sender, RoutedEventArgs e)
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    {
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    timer.Close();
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    ; }

这一块主要是使用了System.Timers.Timer而不是使用DispatcherTimer（distime），在刷新频率很高的情况下distime会有卡顿出现

tostring中是以小时:分钟:秒:毫秒的形式转换，正好做到的项目需求是毫秒后3位，时间格式这一块就不多赘述了

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