C# arcengine，取得ArcMap文档缩略图

 private Image GetThumbnail(IMapDocument pMapDoc)
        {
            return System.Drawing.Image.FromHbitmap((IntPtr)(pMapDoc.Thumbnail.Handle));
        }

        private void button1_Click(object sender, EventArgs e)
        {
            IMapDocument pMapDoc = new MapDocumentClass();
            pMapDoc.Open(@"D:\基本农田空间布局图.mxd", "");
            GetThumbnail(pMapDoc).Save(@"c:\1.jpg");

        }