Wpf treeview not updating
So far in this tutorial, we have mostly created bindings between UI elements and existing classes, but in real life applications, you will obviously be binding to your own data objects.
This is just as easy, but once you start doing it, you might discover something that disappoints you: Changes are not automatically reflected, like they were in previous examples.
It looks like this: As you can see, implementing INotify Property Changed is pretty easy, but it does create a bit of extra code on your classes, and adds a bit of extra logic to your properties.
This is the price you will have to pay if you want to bind to your own classes and have the changes reflected in the UI immediately.
If we update any properties of a contained class, it doesn’t raise any notifications. If I have an Observable Collection of Person object and it is bind to a Tree View.
If I add or remove person object from the Observable Collection I will be able to see the changes in my Tree View also.
If this was a listview instead of a treeview, that would work great (so long as you set the Is Synchronized With Current Item property to true).
Here in this case we need to call the Refresh method of Collection View Source.
This View Model exposes a list of IFolders (List The interesting part in this context is the View which details the XAML-syntax. Note that the binding between the View Model and the View is declared in the XAML directly: So, configuration of the bindings is seen below.
Simple Binding (flat structure): As seen, a simple root-level binding is achieved by using a standard … Do note that you need to inform the Hierarchical Data Template of the datatype to display.
The example is pretty simple, with a User class that will keep the name of the user, a List Box to show them in and some buttons to manipulate both the list and its contents.
The Items Source of the list is assigned to a quick list of a couple of users that we create in the window constructor.