Updating images in a wpf application


Because of WPF’s references to your objects, it is not just enough to drop references to your view and view model.A better alternative is to rely on data binding where you can; create a Dependency Property for the sole purpose of listening to changes on your target property, and use the change notifications in Dependency Property in order to listen to changes on the target property.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.Create a collection with mixed viewmodel types–your original collection, and one that represents the “group”.Use Data Templates to change the appearance of your “group” objects. NET 4.0, Dynamic Resource access is still slower than Static Resource access.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.



They may also help stop a layout pass from rippling through an entire visual tree.For example, if you have a Person View Model class with a property that you want to group by (let’s say Region), it is faster to create a mixed collection of My Group View Model and Person View Model objects, ordered correctly by group, with different Data Templates, than it is to bind to a grouped collection. And worse, once you start nesting Dynamic Resources (for example, a List View whose Style contains a Control Template that references objects through Dynamic Resources), you’re likely to run into situations where you leak controls.This advice is practically impossible to follow, but do your best.Although this is arguably good programming practice, it also tends to be insanely slow.



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