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通过cad中块获取块的略缩图，并保存桌面，效果如下：

附部分代码：

using Autodesk.AutoCAD.Internal;
using System.Drawing;
using System.Drawing.Imaging;
using System.Threading;
using Color = Autodesk.AutoCAD.Colors.Color;
namespace IfoxDemo
{
    public static class 保存略缩图
    {
        [CommandMethod("tt")]
        public static void 保存略缩图tt()
        {

            //新建一个块，把块的律所图存到桌面。
            using var tr = new DBTrans();
            var line = new Line(new Point3d(0, 0, 0), new Point3d(100, 100, 0));
            var pl = line.CurveToPolyline();
            line.ColorIndex = 1;
            var id = tr.BlockTable.Add("test",
                btr =>
                {
                    btr.Origin = new Point3d(0, 0, 0);
                },
                () => // 图元
                {
                   var ty = new List<Entity> { pl };
                   pl.ColorIndex = 1;
                   pl.ConstantWidth =3;
                   return ty;
                },
                () => // 属性定义
                {
                    var id1 = new AttributeDefinition() { Position = new Point3d(0, 0, 0), Tag = "start", Height = 0.02 };
                    var id2 = new AttributeDefinition() { Position = new Point3d(1, 1, 0), Tag = "end", Height = 0.02 };
                    return new List<AttributeDefinition> { id1, id2 };
                }
            );

            var pr = Utils.GetBlockImage(id, 2000, 1600, Autodesk.AutoCAD.Colors.Color.FromRgb(0, 0, 0));
            Bitmap bmp = Bitmap.FromHbitmap(pr);
            bmp.SaveDesktop();
            //
        }
        public static Polyline CurveToPolyline(this Curve cur)
        {
            if (cur is Polyline pl1) return pl1;
            else if (cur is Line line)
            {
                Polyline pl = new Polyline();
                pl.AddVertexAt(0, line.StartPoint.Point2d(), 0, 0, 0);
                pl.AddVertexAt(1, line.EndPoint.Point2d(), 0, 0, 0);
                return pl;
            }
            else if (cur is Arc arc)
            {
                var bug = Math.Tan(arc.TotalAngle / 4);
                Polyline pl = new Polyline();
                pl.AddVertexAt(0, arc.StartPoint.Point2d(), bug, 0, 0);
                pl.AddVertexAt(1, arc.EndPoint.Point2d(), 0, 0, 0);
                return pl;
            }
            else if (cur is Spline sl)
            {
                return (Polyline)sl.ToPolyline();
            }
            else if (cur is Ellipse ellipse)
            {
                return (Polyline)ellipse.Spline.ToPolyline();
            }
            else if (cur is Circle circle)
            {
                Polyline pl = new Polyline();
                var p1 = circle.StartPoint;
                var p2 = circle.EndPoint;
                var bug = Math.Tan(Math.PI / 4);
                pl.AddVertexAt(0, p1.Point2d(), bug, 0, 0);
                pl.AddVertexAt(1, p1.Point2d(), bug, 0, 0);
                pl.Closed = true;
                return pl;
            }
            else if (cur is Polyline2d poly)
            {
                try
                {
                    Polyline pl = new Polyline();
                    pl.ConvertFrom(poly, false);//false代表不写入数据库？
                    return pl;
                }
                catch (Exception)
                {
                    Polyline pl = new Polyline();
                    return pl;
                }
            }
            //else if (cur is Polyline3d poly3d)//尚未完善
            //{
            //    Polyline pl = new Polyline();
            //    pl.ConvertFrom(poly3d, false);//false代表不写入数据库？
            //    return pl;
            //}
            else
            {
                "
 curve转polyline失败！
".Print();
                Polyline pl = new Polyline();
                return pl;
            }
        }
    }
}

using System.Drawing;
using Path = System.IO.Path;
using System.Drawing.Imaging;

namespace IfoxDemo
{
    public  static class SaveBitmapToDesktop
    {
        public static void SaveDesktop(this Bitmap bmp)
        {
            // 获取桌面路径
            string desktopPath = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);

            // 构建文件路径和名称，例如 "MyBitmap.png"
            string filePath = Path.Combine(desktopPath, "MyBitmap.png");

            // 确保文件不会因名称冲突而被覆盖（可选）
            int counter = 1;
            string baseName = Path.GetFileNameWithoutExtension(filePath);
            string extension = Path.GetExtension(filePath);
            while (File.Exists(filePath))
            {
                filePath = Path.Combine(desktopPath, $"{baseName}_{counter}{extension}");
                counter++;
            }

            // 保存Bitmap到文件
            try
            {
                bmp.Save(filePath, ImageFormat.Png); // 使用PNG格式保存，你也可以选择其他格式，如Jpeg
                MessageBox.Show($"Bitmap saved to {filePath}"); // 显示消息框（可选）
            }
            catch (Exception ex)
            {
                MessageBox.Show($"Failed to save bitmap: {ex.Message}"); // 显示错误消息（可选）
            }
        }
    }
}

完整代码（cad插件定制、二次开发）↓↓↓