vroidcustomitemをサムネイル表示 for .NET(SharpShell)

VRoidCustomItemThumbnailer.cs

using System;
using System.Drawing;
using SharpShell.SharpThumbnailHandler;
using System.IO.Compression;
using SharpShell.Attributes;
using System.Runtime.InteropServices;
using System.Linq;
using System.IO;

namespace AlterCoord
{
    [ComVisible(true)]
    [COMServerAssociation(AssociationType.ClassOfExtension, ".vroidcustomitem")]
    public class VRoidCustomItemThumbnailer : SharpThumbnailHandler
    {
        protected override Bitmap GetThumbnailImage(uint width)
        {
            //  Create a stream reader for the selected item stream
            try
            {
                using ZipArchive archive = new ZipArchive(SelectedItemStream, ZipArchiveMode.Read);
                var thumbEntry = archive.GetEntry("thumbnails/thumbnail.png");
                using var stream = thumbEntry.Open();                    
                var img = Image.FromStream(stream);
                stream.Close();

                var metaEntry = archive.GetEntry("v1customitem/meta.json");
                using var metaStream = metaEntry.Open();
                using var sr = new StreamReader(metaStream);
                var category = sr.ReadToEnd();
                category = category.Split('.').Last().Split('\"').First();

                using Graphics g = Graphics.FromImage(img);
                using Font fnt = new Font("Yu Gothic UI", 50, FontStyle.Bold);

                //文字列を位置(0,0)、暗い赤で表示（雑な方法で白く縁取り）
                g.DrawString(category, fnt, Brushes.White, -2, 0);
                g.DrawString(category, fnt, Brushes.White, 2, 0);
                g.DrawString(category, fnt, Brushes.White, 0, -2);
                g.DrawString(category, fnt, Brushes.White, 0, 2);
                g.DrawString(category, fnt, Brushes.DarkRed, 0, 0);

                return new Bitmap(img, new Size((int)width, (int)width));
            }
            catch (Exception exception)
            {
                //  Log the exception and return null for failure
                LogError("An exception occurred opening the text file.", exception);
                return null;
            }
        }
        public VRoidCustomItemThumbnailer()
        {
        }
    }
}