WPF 文件图标转换器

using System;
using System.Drawing;
using System.Globalization;
using System.IO;
using System.Windows;
using System.Windows.Data;
using System.Windows.Interop;
using System.Windows.Media.Imaging;

public class FileIconConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        var path = (string)value;
        using var icon = File.Exists(path) ? Icon.ExtractAssociatedIcon(path) : null;
        if (icon != null)
        {
            return Imaging.CreateBitmapSourceFromHIcon(
                icon.Handle,
                Int32Rect.Empty,
                BitmapSizeOptions.FromEmptyOptions());
        }
        else
        {
            return null;
        }
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}