WPF获取文件夹缩略图

using System;
using System.IO;
using System.Windows;
using System.Windows.Interop;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Runtime.InteropServices;

namespace WpfApp
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void GetFolderThumbnail(string folderPath)
        {
            SHFILEINFO shinfo = new SHFILEINFO();
            IntPtr hImg = SHGetFileInfo(folderPath, 0, ref shinfo, (uint)Marshal.SizeOf(shinfo), SHGFI_ICON | SHGFI_SMALLICON);
            ImageSource imageSource = Imaging.CreateBitmapSourceFromHIcon(shinfo.hIcon, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
            folderIconImage.Source = imageSource;
            DestroyIcon(shinfo.hIcon);
        }

        private const int SHGFI_ICON = 0x100;
        private const int SHGFI_SMALLICON = 0x1;

        [DllImport("shell32.dll")]
        private static extern IntPtr SHGetFileInfo(string pszPath, uint dwFileAttributes, ref SHFILEINFO psfi, uint cbSizeFileInfo, uint uFlags);

        [DllImport("user32.dll")]
        private static extern bool DestroyIcon(IntPtr hIcon);

        [StructLayout(LayoutKind.Sequential)]
        private struct SHFILEINFO
        {
            public IntPtr hIcon;
            public int iIcon;
            public uint dwAttributes;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
            public string szDisplayName;
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 80)]
            public string szTypeName;
        }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            string folderPath = @"C:\Path\To\Folder";
            GetFolderThumbnail(folderPath);
        }
    }
}