【每天一个demo】在CAD当中添加自定义数据

项目目标：我们将创建一个新的字典对象，它用来表示我们雇员就职的 ‘Acme 公司‘（呵呵，当然是虚构的一家公司）的部门。这个“部门”字典对象将包含一个表示部门经理的记录。我们还会加入代码到雇员创建过程，这个过程会加入一个索引到雇员工作的部门。

我们要说明的是如何在DWG文件中创建自定义数据，包括“每个图形”的自定义数据和“每个实体”的自定义数据。“每个图形”的自定义数据是指只在整个图形中加入一次的数据，它表示对象可以引用的单一类型或特性。“每个实体”的自定义数据是指是为特定的对象或数据库中的实体加入的数据。

 

代码如下：

using System;using Autodesk.AutoCAD.Runtime;using Autodesk.AutoCAD.ApplicationServices;using Autodesk.AutoCAD.Colors;using Autodesk.AutoCAD.DatabaseServices;using Autodesk.AutoCAD.EditorInput;using Autodesk.AutoCAD.Geometry;[assembly: CommandClass(typeof(CsMgdAcad7.Class1))] //在运行autocad的同时加载Class1程序namespace CsMgdAcad7{ class Class1 { public Class1() { } private ObjectId CreateEmployeeDefinition() { ObjectId newBtrId = new ObjectId(); //定义一个objectid的对象作为返回值 Database db = HostApplicationServices.WorkingDatabase; //获得当前工作空间的数据库 using (Transaction trans = db.TransactionManager.StartTransaction()) //开始事务 { BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForWrite); if (bt.Has("em")) { newBtrId = bt["em"]; } else { Point3d center = new Point3d(10, 10, 10); //圆 Circle circle = new Circle(center,Vector3d.ZAxis,2); //多文本 MText text=new MText(); text.Contents = "我爱中国人"; text.Location = center; //椭圆 Ellipse ellipse = new Ellipse(center,Vector3d.ZAxis,new Vector3d(3,0,0),0.5,0,0); ObjectId empId = CreateLayer(); text.LayerId = empId; circle.LayerId = empId; ellipse.LayerId = empId; text.ColorIndex = 2; circle.ColorIndex = 3; ellipse.ColorIndex = 1; BlockTableRecord newBtr = new BlockTableRecord(); newBtr.Name = "em"; newBtrId = bt.Add(newBtr); trans.AddNewlyCreatedDBObject(newBtr, true); //让事务知道你在cad当中添加了块表 newBtr.AppendEntity(circle); //在cad当中输出圆 newBtr.AppendEntity(text);//在cad当中输出多文本 newBtr.AppendEntity(ellipse);//在cad当中输出椭圆 trans.AddNewlyCreatedDBObject(circle, true); //让事务知道你在cad当中添加了圆 trans.AddNewlyCreatedDBObject(text, true);//让事务知道你在cad当中添加了多文本 trans.AddNewlyCreatedDBObject(ellipse, true);//让事务知道你在cad当中添加了椭圆 trans.Commit(); //提交数据 } } CreateDivision(); //建立职工词典 return newBtrId; } private void CreateDivision() { Database db = HostApplicationServices.WorkingDatabase; using (Transaction trans = db.TransactionManager.StartTransaction()) { DBDictionary NOD = (DBDictionary)trans.GetObject(db.NamedObjectsDictionaryId, OpenMode.ForWrite); DBDictionary acmeDict; try { acmeDict = (DBDictionary)trans.GetObject(NOD.GetAt("ACME_DIVISION"), OpenMode.ForRead); } catch { acmeDict = new DBDictionary(); NOD.SetAt("ACME_DIVISION", acmeDict); trans.AddNewlyCreatedDBObject(acmeDict, true); } DBDictionary divDict; try { divDict = (DBDictionary)trans.GetObject(acmeDict.GetAt("Sales"), OpenMode.ForWrite); } catch { divDict = new DBDictionary(); acmeDict.UpgradeOpen(); acmeDict.SetAt("Sales", divDict); trans.AddNewlyCreatedDBObject(divDict, true); } Xrecord mgrXRec; try { mgrXRec = (Xrecord)trans.GetObject(divDict.GetAt("Department Manager"), OpenMode.ForWrite); } catch { mgrXRec = new Xrecord(); mgrXRec.Data = new ResultBuffer(new TypedValue((int)DxfCode.Text, "Randolph P. Brokwell")); divDict.SetAt("Department Manager", mgrXRec); trans.AddNewlyCreatedDBObject(mgrXRec, true); } trans.Commit(); } } private ObjectId CreateLayer() { ObjectId layerId; Database db = HostApplicationServices.WorkingDatabase; using (Transaction trans = db.TransactionManager.StartTransaction()) { //获得layer表... LayerTable lt = (LayerTable)trans.GetObject(db.LayerTableId, OpenMode.ForRead); //Check if EmployeeLayer exists... if (lt.Has("em")) { layerId = lt["em"]; } else { //否则，创建个layer. LayerTableRecord ltr = new LayerTableRecord(); ltr.Name = "em"; // 设置layer名称 ltr.Color = Color.FromColorIndex(ColorMethod.ByAci, 2); // 将读的形式更新为写的形式 lt.UpgradeOpen(); layerId = lt.Add(ltr); trans.AddNewlyCreatedDBObject(ltr, true); } trans.Commit(); } return layerId; } [CommandMethod("CREATE")] public void CreateEmployee() { Database db = HostApplicationServices.WorkingDatabase; //获得当前工作空间的数据库 Editor ed = Application.DocumentManager.MdiActiveDocument.Editor; //获得文档编辑 using(Transaction trans=db.TransactionManager.StartTransaction()) //使用事务获取数据库对象 try { BlockTable bt = (BlockTable)trans.GetObject(db.BlockTableId, OpenMode.ForWrite); //首先取得层表 BlockTableRecord btr = (BlockTableRecord)trans.GetObject(bt[BlockTableRecord.ModelSpace],OpenMode.ForWrite); BlockReference br = new BlockReference(new Point3d(0, 10, 0), CreateEmployeeDefinition()); //新建个3D型的椭圆 btr.AppendEntity(br); trans.AddNewlyCreatedDBObject(br, true);//让事务知道你在cad当中新建了个椭圆 Xrecord xRec = new Xrecord(); xRec.Data = new ResultBuffer( new TypedValue((int)DxfCode.Text, "我爱中国11"), new TypedValue((int)DxfCode.Real, 72000), new TypedValue((int)DxfCode.Text, "Sales")); br.CreateExtensionDictionary(); DBDictionary brExtDict = (DBDictionary)trans.GetObject(br.ExtensionDictionary, OpenMode.ForWrite, false); brExtDict.SetAt("EmployeeData", xRec); trans.AddNewlyCreatedDBObject(xRec, true); trans.Commit(); } catch(System.Exception e) { ed.WriteMessage("程序有错：" + e.Message); } } }}

里面加了点注释。对于cad的二次开发还处于模糊当中，还在努力学习中。迫切需要人来一起交流。