MxDrawDatabase database = (MxDrawDatabase)axMxDrawX1.GetDatabase();
            MxDrawLayerTable layerTab = database.GetLayerTable();
            MxDrawLayerTableRecord  layerRec = layerTab.GetAt(ent.Layer);
            if (layerRec.IsLocked)
            {
                // 对象在锁定层上.
            }