Code Red > .NET

how to delete xdata?

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itcad:
hi:
    please tell me how to delete xdata?

Keith™:
Not sure about in .net, but the process is pretty simple ... I do the same think in lisp very easily .. perhaps this code will give you some insight.


--- Code: ---(defun c:delxd (/ ent elist)
  (setq ent (car (entsel)))
  (setq elist (entget ent))
  (entdel ent)
  (entmake elist)
)

--- End code ---

The process is simple ... grab the entity and store the entity data in a variable, but don't store the XDATA, then delete the original object and recreate the object using the saved data.

Chuck Gabriel:
In VBA (and probably .NET as well) the method is to overwrite the xdata for the desired regapp name with a list that consists of nothing but the regapp info.


--- Code: ---Sub eraseXdata(ByRef ent As AcadEntity, ByRef regAppName As String)
  Dim xDataType(0) As Integer
  Dim xDataValue(0) As Variant
 
  xDataType(0) = 1001
  xDataValue(0) = regAppName
  ent.SetXData xDataType, xDataValue
End Sub

--- End code ---

Roughly equivalent C# code:

--- Code: ---void eraseXdata(DBObject obj, string regAppName)
{
  obj.XData = new ResultBuffer(new TypedValue((int)DxfCode.ExtendedDataRegAppName, regAppName));
}

--- End code ---

TonyT:
You might want to rethink your approach to deleting xdata.

(entmake) and (entget) do not have compatible argument/result
lists. Worse, you would also be trashing any references to the object
(e.g., draworder, field references and so on) not to mention its
extension dictionary.


--- Quote from: Keith™ on June 22, 2007, 03:01:58 PM ---Not sure about in .net, but the process is pretty simple ... I do the same think in lisp very easily .. perhaps this code will give you some insight.


--- Code: ---(defun c:delxd (/ ent elist)
  (setq ent (car (entsel)))
  (setq elist (entget ent))
  (entdel ent)
  (entmake elist)
)

--- End code ---

The process is simple ... grab the entity and store the entity data in a variable, but don't store the XDATA, then delete the original object and recreate the object using the saved data.

--- End quote ---

Kerry:

--- Quote from: TonyT on June 22, 2007, 05:25:04 PM ---............. Worse, you would also be trashing any references to the object
(e.g., draworder, field references and so on) not to mention its
extension dictionary.


--- Quote from: Keith™ on June 22, 2007, 03:01:58 PM ---
The process is simple ...
--- End quote ---

--- End quote ---

Yep, it's frustrating to find that "someones" code has wiped out your data ...

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