Demonstrates GetThumbnailCutoffFromType

GetThumbnailCutoffFromType.cs

 static void Main()
 {
     // init system image list or GetThumbnailCutoffFromType will always return 20 (default value)
     SHGetImageList(0, new Guid("46eb5926-582e-4017-9fdf-e8998daa0950"), out var imgList); // IID_IImageList
     Marshal.Release(imgList);

     var video = GetThumbnailCutoffFromType("video");
     Console.WriteLine(video); // 16

     var folder = GetThumbnailCutoffFromType("folder");
     Console.WriteLine(folder); // 32

     var png = GetThumbnailCutoffFromType(".png");
     Console.WriteLine(png); // 20

     var mix = GetThumbnailCutoffFromType(".mix");
     Console.WriteLine(mix); // 20
 }

 [DllImport("windows.storage.dll", CharSet = CharSet.Unicode)]
 private static extern int GetThumbnailCutoffFromType(string type);

 [DllImport("shell32.dll")]
 private static extern int SHGetImageList(int iImageList, [MarshalAs(UnmanagedType.LPStruct)] Guid riid, out nint ppvObj);