autocad.net（c#）获取autocad模型空间窗口大小

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 //by 鸟哥 qq1833183060
//qq群 720924083
//2020-11-09
 /// <summary>
        /// 获取autocad模型空间窗口大小
        /// 参考 https://adndevblog.typepad.com/autocad/2012/04/getting-the-extents-of-autocad-model-window.html
        /// </summary>
        [CommandMethod("ScreenExtents")]
        public void ScreenExtents()
        {
            Document doc = Application.DocumentManager.MdiActiveDocument;

            Database db = doc.Database;

            Editor ed = doc.Editor;
            Point2d screenSize = (Point2d)Application.GetSystemVariable("SCREENSIZE");
            System.Drawing.Point upperLeft = new System.Drawing.Point(0, 0);
            System.Drawing.Point lowerRight = new System.Drawing.Point((int)screenSize.X,(int)screenSize.Y);
            Point3d upperLeftWorld = ed.PointToWorld(upperLeft, 0);

            Point3d lowerRightWorld = ed.PointToWorld(lowerRight, 0);
            using (Transaction Tx = db.TransactionManager.StartTransaction())
            {
                //Draws a line to visualize result...

                Line line = new Line(upperLeftWorld, lowerRightWorld);

                BlockTableRecord btr = Tx.GetObject(db.CurrentSpaceId, OpenMode.ForWrite) as BlockTableRecord;
                btr.AppendEntity(line);

                Tx.AddNewlyCreatedDBObject(line, true);
                Tx.Commit();
            }
        }