Flow Items Source to know that have new collection and refresh the data. 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.Blend-style behaviors also have their own set of lifetime problems.Then there are some problems (like this and this) where WPF leaks for you too.The ability to register for changes to a collection isn’t something that all languages allow.Indeed, it’s not something we might require for every project but it’s arguably a very useful pattern.
We can do that by the "Display Member Binding" attribute and "Binding" markup extension.
We learned about the binding syntax used by XAML to bind to the Data Model that was exposed by the code behind.
The Hub App Template employs a design pattern in software called MVVM, or Model-View-View Model.
Obviously, my goal is to help you better make changes to this template, and a fundamental understanding of MVVM should help you build a mental model of the responsibilities for each class, each piece of the puzzle. In software architecture, a Model is a representation of a given business or domain problem.
If you were building an Accounting system, your Model might have classes for things like Account, Customer, Credit, Debit, and so on.
At a high level, MVVM seeks to “separate concerns”, extracting code that is specific to presentation (the View, or rather, the XAML that defines the user interface), the code specific to the domain (the Model, or rather, the Sample Data Group and Sample Data Item classes), and the code that coordinates the activities of the model and provides the view with access to the model, (the View Model, or rather, the Sample Data Source class).