Best way to suspend control events in Windows Forms?
This seems like a very simple and a very common problem. The simplest example I can think of is this:
The form has five checkboxes with a "check all/check none" checkbox above them. When a user selects checking all checkboxes, I toggle the states of the "children" - obviously I don't want to fire the check events of all the children until I am done setting all of the checkboxes.
I can't find a form-wide suspend control event. If I'm simply missing it then great simple answer. Barring a simple solution that I am just missing, what is the best way (best practice? accepted solution?) to suspend form control events?
Answer
I've come across this before and usually seen people do this:
/*SNIP*/
private bool isMassUpdate;
public void Check1_Check(object sender, EventArgs e)
{
if(!isMassUpdate)
{
do some stuff
}
}
/*SNIP*/
You can also detach and reattach the event handlers, however, I'm told this can be a source of memory leaks.
Information on memory leaks and event handlers: They're not directly linked to attaching and detaching, but we've seen in one of our applications that bad referencing of event handlers down inheritance trees can cause it.