【连载】 .Net cad二次开发（四）

开始往cad数据库中添加实体了。

一、添加实体到模型空间【图纸空间类似】

// 加入实体到模型空间
        public static ObjectId Append(Entity ent, Database db)
        {
            ObjectId id;

            using(Transaction tr = db.TransactionManager.StartTransaction())
            {
                BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForWrite);
                BlockTableRecord modeSpce = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);
                id = modeSpce.AppendEntity(ent);
                tr.AddNewlyCreatedDBObject(ent, true);
                tr.Commit();
            }
            return id;
        }
// 为了避免重复打开数据库，这里就单独列出数组形式重载
        public static ObjectIdCollection Append(DBObjectCollection ents, Database db)
        {
            ObjectIdCollection ids = new ObjectIdCollection();

            using (Transaction tr = db.TransactionManager.StartTransaction())
            {
                BlockTable bt = (BlockTable)tr.GetObject(db.BlockTableId, OpenMode.ForWrite);
                BlockTableRecord modeSpce = (BlockTableRecord)tr.GetObject(bt[BlockTableRecord.ModelSpace], OpenMode.ForWrite);

                foreach (DBObject obj in ents)
                {
                    Entity ent = obj as Entity;
                    if (null != ent)
                    {
                        ids.Add(modeSpce.AppendEntity(ent));
                        tr.AddNewlyCreatedDBObject(ent, true);
                    }
                        
                }

                tr.Commit();
            }
            return ids;
        }//