Observablecollection listbox not updating
Bypasses elements in a sequence as long as a specified condition is true and then returns the remaining elements.
The element's index is used in the logic of the predicate function.(Defined by Enumerable.)In many cases the data that you work with is a collection of objects.
The keys are compared by using a specified comparer.(Defined by Enumerable.)Overloaded.
The elements of each group are projected by using a specified function.(Defined by Enumerable.)Overloaded.
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.
How to handle them may vary, depending on what you're doing and what you're looking to accomplish, but WPF comes with two very easy solutions that you can use: The Observable Collection and the INotify Property Changed interface.
The following example will show you why we need these two things: Try running it for yourself and watch how even though you add something to the list or change the name of one of the users, nothing in the UI is updated.
The index of each source element is used in the intermediate projected form of that element.(Defined by Enumerable.)Overloaded.First I bound Item Source property in XAML than i set Display Member Path to First Name it means Listbox should display only values of First Name property available in Collection.In Code behind, i created one class called People and created one Observable Collection of People class.Now if I change selected item in any of the listbox it will automatically change selection in other listbox if the Is Synchronized With Current Item property is set to true in both Listbox. The item is deleted from the collection but the List View is not reflecting it.