[实体对象] 如何绘制一条PolyLine，给他添加扩展属性，并返回这个Polyline的ObjectId

萧闫子

想绘制一个矩形框，然后给这个矩形框添加一个名称和标记的扩展数据。然后返回这个矩形框的ObjectId。在绘制以后在通过这个矩形的ObjectId重新获得这个矩形的名称和标记。如何做到？下面是我写的一部分代码，没有完成，请大家帮忙了。

1. <ol style="margin-left: 10px !important; color: rgb(102, 102, 102); font-family: 'Microsoft Yahei', Simsun; "><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
   
2. '通过用户指定点后再绘制这个矩形，矩形的长和宽也作为参数
   
3. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">Public Shared Function AddRectangle(ByVal cenPt As Point3d, ByVal Height As Double, _
   
4. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">                                        ByVal Length As Double) As ObjectId
   
5. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim Pt(4) As Point3d
   
6. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Pt(0) = New Point3d(cenPt.X - Length * 0.5, cenPt.Y - Height * 0.5, 0)
   
7. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Pt(1) = New Point3d(cenPt.X + Length * 0.5, cenPt.Y - Height * 0.5, 0)
   
8. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Pt(2) = New Point3d(cenPt.X + Length * 0.5, cenPt.Y + Height * 0.5, 0)
   
9. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Pt(3) = New Point3d(cenPt.X - Length * 0.5, cenPt.Y + Height * 0.5, 0)
   
10. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Pt(4) = New Point3d(cenPt.X - Length * 0.5, cenPt.Y - Height * 0.5, 0)
    
11. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim Pts As New Point3dCollection(Pt)
    
12. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        ' 在内存中创建一个未经拟合的标准三维多段线对象.
    
13. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim ent As New Polyline3d(Poly3dType.SimplePoly, Pts, False)
    
14. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
    
15. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        'Add the rectangle polyline entity to model space
    
16. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim acEntId As ObjectId = AppendEntity(ent)
    
17. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
    
18. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim dt As DataTable = New DataTable()
    
19. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        dt.TableName = "属性表"
    
20. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        dt.AppendColumn(CellType.CharPtr, "Name")
    
21. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        dt.AppendColumn(CellType.CharPtr, "Tag")
    
22. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim row As DataCellCollection = New DataCellCollection()
    
23. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim Name As DataCell = New DataCell()
    
24. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim Tag As DataCell = New DataCell()
    
25. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Name.SetString("矩形框")
    
26. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Tag.SetString("矩形标记")
    
27. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        row.Add(Name)
    
28. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        row.Add(Tag)
    
29. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        dt.AppendRow(row, True)
    
30. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
    
31. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        ent.CreateExtensionDictionary()
    
32. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim exDic As DBDictionary = New DBDictionary()  '如何将扩展数据记录下来啊？
    
33. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        exDic.SetAt("属性表", dt)
    
34. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
    
35. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
    
36. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        '返回ObjectId
    
37. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Return acEntId
    
38. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">    End Function
    
39. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">
    
40. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">' 将图形对象加入到模型空间的函数.
    
41. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">    Public Shared Function AppendEntity(ByVal ent As Entity) As ObjectId
    
42. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        ' 得到当前文档图形数据库.
    
43. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim db As Database = HostApplicationServices.WorkingDatabase
    
44. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Dim entId As ObjectId
    
45. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        Using trans As Transaction = db.TransactionManager.StartTransaction
    
46. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            ' 以读方式打开块表.
    
47. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            Dim bt As BlockTable = trans.GetObject(db.BlockTableId, OpenMode.ForRead)
    
48. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            ' 以写方式打开模型空间块表记录.
    
49. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            Dim btr As BlockTableRecord = trans.GetObject(bt(BlockTableRecord.ModelSpace), OpenMode.ForWrite)
    
50. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            ' 将图形对象的信息添加到块表记录中,并返回ObjectId对象.
    
51. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            entId = btr.AppendEntity(ent)
    
52. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            ' 把图形对象添加到事务处理中.
    
53. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            trans.AddNewlyCreatedDBObject(ent, True)
    
54. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            ' 提交事务处理.
    
55. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">            trans.Commit()
    
56. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">        End Using
    
57. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; background-color: rgb(255, 255, 255); color: rgb(51, 102, 153); ">        Return entId
    
58. </li><li style="padding-left: 10px; list-style-type: decimal-leading-zero; font-family: Monaco, Consolas, 'Lucida Console', 'Courier New', serif; font-size: 12px; line-height: 1.8em; ">    End Function</li></ol>

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