添加和读取扩展数据

1、添加扩展数据

  Private Sub 添加扩展数据(ByVal ent As Entity, ByVal DictName As String, ByVal TypedValue As TypedValue)
        If ent.ExtensionDictionary = Nothing Then
            ent.CreateExtensionDictionary()
        End If
        Using tr As Transaction = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.Database.TransactionManager.StartTransaction
            Dim xDict As DatabaseServices.DBDictionary = tr.GetObject(ent.ExtensionDictionary, OpenMode.ForWrite)
            If Not xDict.Contains(DictName) Then
                xDict.UpgradeOpen()
                Dim xrec As New Xrecord
                Dim rb As New ResultBuffer
                rb.Add(TypedValue)
                xrec.Data = rb
                xDict.SetAt(DictName, xrec)
                tr.AddNewlyCreatedDBObject(xrec, True)
            End If
        End Using
    End Sub

    Private Sub Button16_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button16.Click
        Dim CurOption As PromptSelectionOptions = New PromptSelectionOptions()
        With CurOption
            .MessageForAdding = "请选择一个图元:"
            .RejectObjectsOnLockedLayers = True
            .RejectPaperspaceViewport = True
        End With
        Dim doc As Autodesk.AutoCAD.ApplicationServices.Document = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument
        Dim prEntRes As PromptSelectionResult = doc.Editor.GetSelection(CurOption)
        If prEntRes.Status = PromptStatus.OK Then
            Using documentLock As Autodesk.AutoCAD.ApplicationServices.DocumentLock = doc.LockDocument()
                Using db As Autodesk.AutoCAD.DatabaseServices.Database = Autodesk.AutoCAD.DatabaseServices.HostApplicationServices.WorkingDatabase
                    Using trans As Autodesk.AutoCAD.DatabaseServices.Transaction = db.TransactionManager.StartTransaction
                        Dim ent1 As Entity = CType(trans.GetObject(prEntRes.Value(0).ObjectId, DatabaseServices.OpenMode.ForWrite, False), Entity)
                        添加扩展数据(ent1, "WidthRevised", New TypedValue(DxfCode.Bool, True))
                        trans.Commit()
                    End Using
                End Using
            End Using
        End If
    End Sub

 

2、读取扩展数据

Private Function 读取扩展数据(ByVal ent As Entity, ByVal DictName As String) As Object
        Dim doc As Autodesk.AutoCAD.ApplicationServices.Document = Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument
        Using TR As Autodesk.AutoCAD.DatabaseServices.Transaction = doc.TransactionManager.StartTransaction
            If ent.ExtensionDictionary.IsNull Then
                Return Nothing
            Else
                Dim xDict As DBDictionary = CType(Autodesk.AutoCAD.ApplicationServices.Application.DocumentManager.MdiActiveDocument.TransactionManager.GetObject(ent.ExtensionDictionary, DatabaseServices.OpenMode.ForRead), DBDictionary)
                If xDict.Contains(DictName) Then
                    Dim xRecId As ObjectId = xDict.GetAt(DictName)
                    Dim xRec As Xrecord = CType(TR.GetObject(xRecId, DatabaseServices.OpenMode.ForRead), Xrecord)
                    Return xRec.Data.AsArray(0).Value
                Else
                    Return Nothing
                End If
            End If
        End Using
    End Function