skip to content »

tenpoint.ru

Wpf listview binding not updating

wpf listview binding not updating-54

Default View, you can also access a collection’s default view using All collections have a default Collection View.

wpf listview binding not updating-37

Many moons ago, I asked on the WPF forums if anybody had a way of data-binding the Selected Items property of a List Box.Views allow the same data collection to be viewed in different ways, depending on sorting, filtering, or grouping criteria.Every collection has one shared default view, which is used as the actual binding source when a binding specifies a collection as its source.When you press the button you’ll see that the List Box obediently updates to show all items selected.The Two List Synchronizer code does not make especially thrilling reading, so I won’t show it here.Instead, this is meant to be a slightly more practical guide to squeezing performance out of WPF in ways that are probably more likely affecting you.

and its subclasses List Box and List View exacerbate performance problems because these controls are highly dynamic (resolution happens “late”), involve WPF collections (which are slow), and have difficult and unpredictable lifetimes for their child controls.

There is no shortage of information out there on how to speed up the performance of WPF applications, but too often the focus is on the weird stuff instead of the simpler issues.

I’m not going to talk about things like writing to to optimize drawing—it’s a topic covered to death elsewhere.

With that in place the Selected Names collection in my View Model is updated whenever Selected Items on the List Box changes.

And to prove it works the other way to, I’ve created a Select All command on the View Model that puts all available names into the Selected Names collection.

We don’t have to create it because WPF does it for us. Next we’ll find out how to access and manipulate that default view.