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    Wpf treeview observablecollection not updating

    This should be all we need to know, but let’s see if we can find proof of the theory above about the property, like so: If the object is of a type we can not edit, for example because it comes from a library we’re depending on, we can also explicitly clear the binding by calling: Note that if a binding has the One Time mode, this leak will not be present as the binding is done only once and the binding target will not listen for changes on the source object.A similar issue to the WPF binding leak is the , for example, to our collection.Scrollbar performance is often a big problem in larger WPF apps because of problems that seem trivial for small collections, but suddenly blow up with larger data sets.Also, it can be difficult in WPF to know exactly when the system is finished with an object.And probably you all read books about XAML, WPF, Silverlight where author’s on super simplified examples show how it is easy to bind this to that – 2 minutes and the job is done.But in real life applications situation is not so nice like it is shown in pretty useless (for real application developers) technology overview books.

    In the previous example, the only thing to change to make the collection modifiable across threads is the instantiation of the collection in the View Model : to raise the event when the collection is modified from the main thread can cause unpredictable behavior.

    First this is not some newbie tutorial on what is MVVM and how to use it in . This article mostly about problem’s that you will face in real life applications using MVVM pattern with WPF and Silverlight vanilla controls library and how to solve them.

    A lot has been written on how WPF and Silverlight are great with MVVM pattern.

    For views, you get the get a WPF notification that a viewmodel is about to go unused by a view.

    Blend-style behaviors also have their own set of lifetime problems.

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