ListBox Populating Question

[NvrBst]

I populate a ListBox with a LogFile that has about (~1000 lines). The
ListBox's datasource is a BindingList<str ing>. Whenever I add the
elements, with the datasource set, it takes about 2 mins.

I've tried wrapping "Listbox.Suspen dLayout()" and
"Listbox.Resume Layout()" around the for loop (that does the adding)
but it still takes about 2 mins. Only thing I can seem to do is set
the DataSource to null, add to the BindingList and then reset the
DataSource (this way the ListBox is populated in about 1 second or
less)... Which, I think, defeats the purpose of the BindingList?

How do I tell the ListBox (or the BindingList) to temporarly stop
updating its bindings? Then I can just call the ".ResetBindings ()"
function after I'm done adding to the BindingList.

Thanks
NB

[Marc Gravell]

Well, if you still a BindingSource between the ListBox and the
BindingList<T>, then you can simply suspend the BindingSource:

bindingSource1. DataSource = list;
listbox1.DataSo urce = bindingSource1;
// ...
bindingSource1. SuspendBinding( );
// ...
bindingSource1. ResumeBinding() ;
// (might also need bindingSource1. ResetBindings(f alse);
// but see how it goes without first)

Alternatively, you can just tell the list itself to shut up for a
while:

bool wasEnabled = list.RaiseListC hangedEvents;
list.RaiseListC hangedEvents = false;
try
{
// ...
}
finally
{
if (wasEnabled) // then re-enable it and force a
refresh
{
list.RaiseListC hangedEvents = true;
list.ResetBindi ngs();
}
}

That do?

Marc

[NvrBst]

On Jan 15, 11:49*pm, Marc Gravell <marc.grav...@g mail.comwrote:

Well, if you still a BindingSource between the ListBox and the
BindingList<T>, then you can simply suspend the BindingSource:

* * * * * * bindingSource1. DataSource = list;
* * * * * * listbox1.DataSo urce = bindingSource1;
* * * * * * // ...
* * * * * * bindingSource1. SuspendBinding( );
* * * * * * // ...
* * * * * * bindingSource1. ResumeBinding() ;
* * * * * * // (might also need bindingSource1. ResetBindings(f alse);
* * * * * * // but see how it goes without first)

Alternatively, you can just tell the list itself to shut up for a
while:

* * * * * * bool wasEnabled = list.RaiseListC hangedEvents;
* * * * * * list.RaiseListC hangedEvents = false;
* * * * * * try
* * * * * * {
* * * * * * * * // ...
* * * * * * }
* * * * * * finally
* * * * * * {
* * * * * * * * if (wasEnabled) // then re-enable it and force a
refresh
* * * * * * * * {
* * * * * * * * * * list.RaiseListC hangedEvents = true;
* * * * * * * * * * list.ResetBindi ngs();
* * * * * * * * }
* * * * * * }

That do?

Marc

Ahh, Thank you kindly. Both methods you mentioned works perfectly :)

NB