/// <devdoc>
/// Validates the last unvalidated control and its ancestors up through (but not including) ancestorControl.
/// </devdoc>
/// <internalonly/>
private bool ValidateThroughAncestor(Control ancestorControl)
{
if (ancestorControl == null)
{
ancestorControl = this;
}
if (validating)
{
return(false);
}
if (unvalidatedControl == null)
{
unvalidatedControl = focusedControl;
}
//return true for a Container Control with no controls to validate....
//
if (unvalidatedControl == null)
{
return(true);
}
if (!ancestorControl.IsDescendant(unvalidatedControl))
{
return(false);
}
this.validating = true;
bool cancel = false;
Control currentActiveControl = activeControl;
Control currentValidatingControl = unvalidatedControl;
if (currentActiveControl != null)
{
currentActiveControl.ValidationCancelled = false;
}
try {
while (currentValidatingControl != ancestorControl)
{
if (currentValidatingControl.CausesValidation)
{
bool validationCancelled = false;
try {
validationCancelled = currentValidatingControl.NotifyValidating();
}
catch (Exception) {
// if the handler threw, we have to cancel
cancel = true;
throw;
}
// check whether the handler said cancel
if (validationCancelled)
{
cancel = true;
break;
}
else
{
try {
currentValidatingControl.NotifyValidated();
}
catch (Exception e) {
Application.OnThreadException(e);
}
}
}
currentValidatingControl = currentValidatingControl.ParentInternal;
}
if (cancel)
{
if (currentActiveControl == activeControl)
{
if (currentActiveControl != null)
{
CancelEventArgs ev = new CancelEventArgs();
ev.Cancel = true;
currentActiveControl.NotifyValidationResult(currentValidatingControl, ev);
if (currentActiveControl is ContainerControl)
{
ContainerControl currentActiveContainerControl = currentActiveControl as ContainerControl;
if (currentActiveContainerControl.focusedControl != null)
{
currentActiveContainerControl.focusedControl.ValidationCancelled = true;
}
currentActiveContainerControl.ResetActiveAndFocusedControlsRecursive();
}
}
}
SetActiveControlInternal(unvalidatedControl);
}
}
finally {
unvalidatedControl = null;
validating = false;
}
return(!cancel);
}
