WPFヘルパー:ListViewItemDoubleClick.cs – ファイルリストビューのダブルクリックビヘイビア

using System.Diagnostics;
using System.IO;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace Maywork.WPF.Helpers;

public static class ListViewItemDoubleClick
{
    public static readonly DependencyProperty EnableProperty =
        DependencyProperty.RegisterAttached(
            "Enable",
            typeof(bool),
            typeof(ListViewItemDoubleClick),
            new PropertyMetadata(false, OnEnableChanged));

    public static void SetEnable(DependencyObject obj, bool value)
        => obj.SetValue(EnableProperty, value);

    public static bool GetEnable(DependencyObject obj)
        => (bool)obj.GetValue(EnableProperty);

    private static void OnEnableChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        if (d is not ListView listView) return;

        if ((bool)e.NewValue)
        {
            listView.MouseDoubleClick += OnDoubleClick;
        }
        else
        {
            listView.MouseDoubleClick -= OnDoubleClick;
        }
    }

    private static void OnDoubleClick(object sender, MouseButtonEventArgs e)
    {
        if (sender is not ListView listView) return;

        var item = listView.SelectedItem;

        if (item is not IFileItem fileItem) return;

        // VM取得
        if (listView.DataContext is INavigationViewModel<IFileItem> vm)
        {
            if (fileItem.IsDirectory)
            {
                vm.Navigate(fileItem);
            }
            else
            {
                Process.Start(new ProcessStartInfo
                {
                    FileName = fileItem.Path,
                    UseShellExecute = true
                });
            }
        }
    }
}