请教：有什么办法可以给DWG文件添加开展数据吗？

zjh2785

我想在dwg文件里面储存一个比例值，这样我下次打开图形绘图时就可以直接从图层中读取我之前设置好的比例值。

dong20030432

应该是扩展数据吧？

dong20030432

下面是VBA教程里面的内容，.net不知道怎么用。
Sub Example_SetXdata()
    ' This example creates a line and attaches extended data to that line.
   
    ' Create the line
    Dim lineObj As AcadLine
    Dim startPt(0 To 2) As Double, endPt(0 To 2) As Double
    startPt(0) = 1#: startPt(1) = 1#: startPt(2) = 0#
    endPt(0) = 5#: endPt(1) = 5#: endPt(2) = 0#
    Set lineObj = ThisDrawing.ModelSpace.AddLine(startPt, endPt)
    ZoomAll

    ' Initialize all the xdata values. Note that first data in the list should be
    ' application name and first datatype code should be 1001
    Dim DataType(0 To 9) As Integer
    Dim Data(0 To 9) As Variant
    Dim reals3(0 To 2) As Double
    Dim worldPos(0 To 2) As Double
   
    DataType(0) = 1001: Data(0) = "Test_Application"
    DataType(1) = 1000: Data(1) = "This is a test for xdata"

    DataType(2) = 1003: Data(2) = "0"                   ' layer
    DataType(3) = 1040: Data(3) = 1.23479137438413E+40  ' real
    DataType(4) = 1041: Data(4) = 1237324938            ' distance
    DataType(5) = 1070: Data(5) = 32767                 ' 16 bit Integer
    DataType(6) = 1071: Data(6) = 32767                 ' 32 bit Integer
    DataType(7) = 1042: Data(7) = 10                    ' scaleFactor

    reals3(0) = -2.95: reals3(1) = 100: reals3(2) = -20
    DataType(8) = 1010: Data(8) = reals3                ' real
   
    worldPos(0) = 4: worldPos(1) = 400.99999999: worldPos(2) = 2.798989
    DataType(9) = 1011: Data(9) = worldPos              ' world space position
   
    ' Attach the xdata to the line
    lineObj.SetXData DataType, Data
   
    ' Return the xdata for the line
    Dim xdataOut As Variant
    Dim xtypeOut As Variant
    lineObj.GetXData "", xtypeOut, xdataOut
   
End Sub

yshf

//如果仅仅是保存一个比例值，用系统变量较为方便
//给系统变量设置新值
Application.SetSystemVariable("UserR5", 比例值);
// 获取系统变量的当前值
double Blz = System.Convert.ToDouble(Application.GetSystemVariable("UserR5"));