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_DTE.UndoContext Property

Gets the global UndoContext object.

Namespace: EnvDTE
Assembly: EnvDTE (in envdte.dll)

UndoContext UndoContext { get; }
/** @property */
UndoContext get_UndoContext ()

function get UndoContext () : UndoContext

Property Value

A UndoContext object.

Sub UndoContextExample()
   Dim selection As TextSelection = DTE.ActiveDocument.Selection()
   Dim start As EditPoint = selection.TopPoint.CreateEditPoint()
   Dim endpt As TextPoint = selection.BottomPoint
   Dim commentStart As String

   DTE.UndoContext.Open("Comment Region")
   Try
      Do While (start.LessThan(endpt))
         start.Insert(commentStart)
         start.LineDown()
         start.StartOfLine()
      Loop
   Finally
      ' If an error occured, then need to make sure that the undo 
      ' context is cleaned up. Otherwise, the editor can be left in a 
      ' perpetual undo context.
      DTE.UndoContext.Close()
   End Try
End Sub
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