将实体前置显示(置顶显示)

public static void DrawOrderToTop(this ObjectIdCollection collection)
{
    Document doc = Application.DocumentManager.MdiActiveDocument;
    Database db = doc.Database;
    Editor ed = doc.Editor;
    
    using (doc.LockDocument())
    {
         using (Transaction tr = db.TransactionManager.StartTransaction())
         {
            try
            {
                BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForWrite, false);
                BlockTableRecord btr = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite, false);
                DrawOrderTable orderTable = (DrawOrderTable)tr.GetObject(btr.DrawOrderTableId, OpenMode.ForWrite);
                orderTable.MoveToTop(collection);
                tr.Commit();
            }
            catch (Autodesk.AutoCAD.Runtime.Exception exc)
            {
                tr.Abort();
            }
         }

         ed.UpdateScreen();
    }
}

同理, 将orderTable.MoveToTop(collection)改为orderTable.MoveToBottom(collection)可实现置底显示.