WPF 单击与双击操作区分

private void MyMouseDownHandler(object sender, MouseButtonEventArgs e)
{
    if (e.ClickCount == 2)
    {
        // Handle double-click
    }
}

using System;
using System.Windows.Input;
using System.Windows.Threading;

namespace xxx.xxx;

/// <summary>
/// 通过延迟判断来区分鼠标单击和双击操作，
/// 对于需要严格区分单击和双击的场景使用。
/// 影响：单击的响应会有延迟，延迟 220 ms
/// </summary>
internal class MouseDoubleClickHelper
{
    private static readonly TimeSpan DoubleClickCheckTime = TimeSpan.FromMilliseconds(220); // ms

    private DateTime _lastClickTime = DateTime.MinValue;

    private readonly DispatcherTimer _timer;

    /// <summary>
    /// 单击时的动作
    /// </summary>
    public Action<object, MouseButtonEventArgs>? ClickAction { get; set; }

    /// <summary>
    /// 双击时的动作
    /// </summary>
    public Action<object, MouseButtonEventArgs>? DoubleClickAction { get; set; }

    public MouseDoubleClickHelper(Dispatcher dispatcher)
    {
        _timer = new DispatcherTimer(DoubleClickCheckTime, DispatcherPriority.Input, TimerCallback, dispatcher);
    }

    private void TimerCallback(object? _, EventArgs __)
    {
        // ReSharper disable once UsePatternMatching
        var args = _timer.Tag as (object sender, MouseButtonEventArgs e)?;

        if (args != null)
        {
            // 计时器到，没有出现第二次点击，则认为是单击动作，执行单击操作
            ClickAction?.Invoke(args.Value.sender, args.Value.e);
            _timer.Tag = null;
        }
    }

    /// <summary>
    /// 鼠标点击时调用
    /// </summary>
    public void OnMouseDown(object sender, MouseButtonEventArgs e)
    {
        var now = DateTime.Now;
        var span = now - _lastClickTime;

        if (span > DoubleClickCheckTime)
        {
            // 首次点击，不立即执行，启动计时器，延迟执行
            _timer.Tag = (sender, e);
            _timer.Start();
        }
        else if (span <= DoubleClickCheckTime)
        {
            // 停掉单击的执行
            _timer.Tag = null;
            _timer.Stop();
            if (e.ClickCount == 2)
            {
                // 执行双击动作
                DoubleClickAction?.Invoke(sender, e);
            }
        }

        _lastClickTime = now;
    }
}

<Project Sdk="Microsoft.NET.Sdk">
  <PropertyGroup>
    <TargetFramework>net8.0-windows</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
    <UseWPF>true</UseWPF>
    <UseWindowsForms>true</UseWindowsForms>
  </PropertyGroup>
</Project>