DataDOMEvent.IsUndoRedo Property
Gets a value indicating whether the data validation event occurs during an undo operation or a redo operation.
Namespace: Microsoft.Office.Interop.InfoPath.SemiTrust
Assembly: Microsoft.Office.Interop.InfoPath.SemiTrust (in Microsoft.Office.Interop.InfoPath.SemiTrust.dll)
Syntax
'Declaration
ReadOnly Property IsUndoRedo As Boolean
Get
'Usage
Dim instance As DataDOMEvent
Dim value As Boolean
value = instance.IsUndoRedo
bool IsUndoRedo { get; }
Property Value
Type: System.Boolean
Remarks
When an undo or a redo operation takes place, the form's underlying XML document is placed in a read-only state and cannot be modified. This can sometimes occur during an OnAfterChange event; when it does, the IsUndoRedo property is used to bypass the data validation that it contains.
Important
This member can be accessed only by forms running in the same domain as the currently open form, or by forms that have been granted cross-domain permissions.
Examples
In the following example, the IsUndoRedo property is used to determine whether the event is occurring during an undo or redo operation. If it is, the event handler is exited using the return statement, otherwise the custom function Calculate is called:
[InfoPathEventHandler(MatchPath="/my:myFields/my:field1", EventType=InfoPathEventType.OnAfterChange)]
public void field1_OnAfterChange(DataDOMEvent e)
{
if (e.IsUndoRedo)
{
// An undo or redo operation has occurred and the DOM is read-only.
return;
}
Calculate();
}