一个简单的 WPF 程序，用于显示实时时间

直接贴代码了：

TimeShowerWindow.xaml

<Window x:Class="HelloWorld.TimeShowerWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:HelloWorld"
        mc:Ignorable="d"
        Title="WPF Timer" Height="350" Width="525">
    <Window.Resources>
        <Style TargetType="{x:Type Button}">
            <Setter Property="Padding" Value="5" />
            <Setter Property="Margin" Value="5" />
        </Style>
    </Window.Resources>

    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <StackPanel Orientation="Horizontal">
            <Button x:Name="startDispatcher" Content="Start Dispatcher Timer" Click="StartDispatcher" />
            <Button x:Name="startTimer" Content="Start Timer" Click="StartTimer" />
            <Button x:Name="reset" Content="Reset" IsEnabled="False" Click="Reset" />
        </StackPanel>

        <Label x:Name="clock"
               Grid.Row="1"
               VerticalAlignment="Center"
               HorizontalAlignment="Center"
               FontSize="25"
               FontWeight="Bold" />
    </Grid>
</Window>

TimeShowerWindow.xaml.cs

using System;
using System.ComponentModel;
using System.Threading;
using System.Windows;
using System.Windows.Threading;

namespace HelloWorld
{
    /// <summary>
    /// TimeShowerWindow.xaml 的交互逻辑
    /// </summary>
    public partial class TimeShowerWindow : Window
    {
        private DispatcherTimer dispatcherTimer; //方式1（推荐WPF开发时使用）

        private Timer timer;  //方式2：通用方式

        public TimeShowerWindow()
        {
            InitializeComponent();

            // 方式1 - 对象初始化，以及指定相应的委托程序
            dispatcherTimer = new DispatcherTimer { Interval = new TimeSpan(, , ) };
            dispatcherTimer.Tick += OnDispatcherTimer;

            // 方式2 - 对象初始化，以及指定相应的委托程序
            timer = new Timer(OnTimer, null, Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
        }

        /// <summary>
        /// 方式1 的按钮点击事件处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void StartDispatcher(object sender, RoutedEventArgs e)
        {
            dispatcherTimer.Start();
            ShowTime();
            EnableStartButtons(false);
        }

        /// <summary>
        /// 方式2 的按钮点击事件处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void StartTimer(object sender, RoutedEventArgs e)
        {
            timer.Change(TimeSpan.Zero, new TimeSpan(, , ));
            EnableStartButtons(false);
        }

        /// <summary>
        /// 重置按钮的点击事件处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void Reset(object sender, RoutedEventArgs e)
        {
            timer.Change(Timeout.InfiniteTimeSpan, Timeout.InfiniteTimeSpan);
            dispatcherTimer.Stop();
            EnableStartButtons(true);
            clock.Content = string.Empty;
        }

        /// <summary>
        /// 启用或禁用按钮
        /// </summary>
        /// <param name="enabled"></param>
        private void EnableStartButtons(bool enabled)
        {
            startDispatcher.IsEnabled = enabled;
            startTimer.IsEnabled = enabled;
            reset.IsEnabled = !enabled;
        }

        private void OnDispatcherTimer(object sender, EventArgs e)
        {
            ShowTime();
        }

        private void OnTimer(object state)
        {
            //子线程中更新 UI 线程，必须使用
            Dispatcher.Invoke(() => ShowTime());
        }

        /// <summary>
        /// 此方法运行在 UI 线程
        /// </summary>
        private void ShowTime()
        {
            clock.Content = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
        }
    }
}

运行截图

谢谢浏览！