CAD 二次开发 图层操作（1）创建图层

CAD二次开发的资料比较少，除了李冠亿先生的《深居浅出AutoCAD二次开发》这本书之外，目前没有找到合适的参考资料。现将自己工作中用的的一些方法贴出来。方便各位网友快速入门。

 

#region 添加图层

        /// <summary>

        /// 添加图层

/// </summary>

        /// <param name="layName"></param>

/// <param name="layColor"></param>

        private ObjectId AddLayer(string layName, short layColor)

        {

            ObjectId oidReturn = new ObjectId(); ;

            using (Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.LockDocument())

            {

                Database database = HostApplicationServices.WorkingDatabase;

                Editor editor = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Editor;

                using (Transaction transaction = database.TransactionManager.StartTransaction())

                {

                    try

                    {

                        ObjectId id;

                        LayerTable table = transaction.GetObject(database.LayerTableId, OpenMode.ForWrite) as LayerTable;

                        LayerTableRecord record = new LayerTableRecord();

                        if (table.Has(layName))

                        {

                            id = table.Id;

                            record = transaction.GetObject(id, OpenMode.ForWrite) as LayerTableRecord;

                            record.IsOff = false;

                            record.IsLocked = false;

                            if (id != database.Clayer)

                            {

                                record.IsFrozen = false;

                            }

                        }

                        else

                        {

                            record.Name = layName;

                            id = table.Add(record);

                            transaction.AddNewlyCreatedDBObject(record, true);

                        }

                        record.Color = Autodesk.AutoCAD.Colors.Color.FromColorIndex(ColorMethod.ByColor, layColor);

                        database.Clayer = id;

                        oidReturn = id;

                        transaction.Commit();

                    }

                    catch (Exception exception)

                    {

                        editor.WriteMessage("Error in addLayer2(): " + exception.Message);

                    }

                }

                return oidReturn;

            }

        }

        #endregion

如上述代码所示：

输入参数为：图层名称，和图层颜色

实现该功能的思路为：

锁定图档，

开启事务

获得当前图档的图层表（LayerTable）；

像操作关系数据库那样创建一条图层表的新 纪录；

对新纪录赋予图层名称，定义图层颜色；

通过添加到图层表，获得记录主键；

通过事务，将新图层记录添加到图当中；

提交事务；

完成。

 

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