XXMHR.gif' alt='Themes For Wpf Applications' title='Themes For Wpf Applications' />Twelve Ways to Improve WPF Performance. 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. Im not going to talk about things like writing to Writable. Bitmaps to optimize drawingits a topic covered to death elsewhere. Instead, this is meant to be a slightly more practical guide to squeezing performance out of WPF in ways that are probably more likely affecting you. Some general notes. Items. Control and its subclasses List. Box and List. View exacerbate performance problems because these controls are highly dynamic resolution happens late, involve WPF collections which are slow, and have difficult and unpredictable lifetimes for their child controls. 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. For views, you get the Framework. Element. Unloaded event, but it gets raised at times you might not expect such as system theme changes and not at times when you might application shutdown. On viewmodels associated with views, youll never 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. Then there are some problems like this and this where WPF leaks for you too. Finally, there are things this, this, this, this, this, and this that simply perform worse than you likely expect. Finally, there are old UIWin. Forms problems this, this, and this that never really went awaytheyre just less likely to happen. Hampton Bay Altura 56 Manual'>Hampton Bay Altura 56 Manual. Fix Binding Errors. Hard code widths and heights where possible. Avoid Collection. View. Grouping. Optimize bindings to collections that change. Avoid Dynamic. Resources. Avoid Resource. Dictionary. Themes For Wpf Applications' title='Themes For Wpf Applications' />OK thanks Rich, I appreciate you taking the time to reply. As a business developing Windows desktop applications we decided to use WPF many years back and. Powerful search capability officially introduced, providing endusers with an easy to use UI for finding items in the datagrids cells. Users can search forwards or. NET Controls for Serious Business Applications. Save your time for the big problems when you use this complete collection of awardwinning performant, extensible. Themes For Wpf Applications' title='Themes For Wpf Applications' />Try to think of your top three movie sequels. Which ones come to mind Having trouble Well, that might be because its not often that you find a sequel that is. In this article you will learn about the most asked WPF Interview questions and answers. Simplify your visual tree. Be wary of System. Windows. Interactivity. Behaviorlt T. On. Detaching. Do not use Dependency. Property. Descriptor for any reasonever. Be careful of viewmodel events. Batch up Dispatcher. Begin. Invoke. In general, beware of memory leaks. I. Fix Binding Errors and Exceptions. Every time a binding error occurs, your app hangs for just a split second as it writes out errors to the trace log. If you have a lot of binding errors, then those split seconds start to add up. Make sure to go through your bindings, especially those on Items. Controls List. Views, custom grids, etc. Open up your app in the debugger and play around, especially where there is slowness. Make sure all bindings resolve without errors. Relative. Source in Data. Templates may also result in bindings that break initially, but then later resolve properly. Be wary of them, and try to use inherited attached properties instead of relying on Relative. Install Radiance For Windows. Source in Data. Templates. Viewmodel bindings. Make sure that your views and view models are in sync. Use Re. Sharper 6 to help you find broken bindings. If youre binding to a collection of objects with mixed types, add different Data. Templates so that none of them refer to non existent properties. Make sure that your converters arent throwing exceptions. These have a cost too. View based Relative. Source bindings. When using List. Boxes and List. Views, its a common problem to have this problem. Avoid Relative. Source. Find. Ancestor expressions at all cost here, because the deferred behavior of templates cause the object and its bindings to be created and resolved before the List. Box. ItemList. View. Item is added to the visual tree. An alternative is to define an attached dependency property on the List. Box. ItemList. View. Item, and use property inheritance to give your child items the necessary property values. This essentially pushes property values down the visual tree instead of searching up. II. Hard code sizes where possible. This may not always be a practical or desirable solution, but layout passes perform faster when widths and heights do not have to be recalculated. They may also help stop a layout pass from rippling through an entire visual tree. And always set specific widths on columns in a grid be it a List. View Grid. View or any third party control, because these tend to be very expensive, especially with larger data sets. III. Avoid Collection. View. Grouping. Grouping in WPF doesnt perform terribly well, especially with List. Views and Grid. Views. Create a collection with mixed viewmodel typesyour original collection, and one that represents the group. Use Data. Templates to change the appearance of your group objects. For example, if you have a Person. Hp Compaq 8200 Elite Convertible Mini Tower Pc Drivers here. View. Model class with a property that you want to group by lets 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. Unfortunately, its a lot more work. IV. Optimize bindings to collections that change. Repeatedly calling Observable. Collectionlt T. Add when the collection is data bound can be a prohibitively expensive operation, especially with thousands of rows. Unfortunately, the framework provides no easy, satisfactory fix. Fix 1 Use Observable. Collection as is, but break bindings. Break the binding to the collection. Update the collection while not data bound. Re bind. 1. some methods removed for brevitypublicpartialclass My. View. Model INotify. Property. Changed. Observable. Collectionlt T people. IList People. getreturn people privatesetifpeople value. On. Property. ChangedPeople. Batch. Add. PeopleIEnumerablelt Person new. Peoplevar current. People people. WPF from listening to the changes that were about to performthis. Peoplenull. changeforeachvar person in new. People. current. People. Addperson. WPF to rebind but only once instead of once for each personthis. People current. People Fix 2 Use the older. NET 2. 0 era collections instead. Use System. Component. Model. Binding. Listlt T from the old days instead it has an API for suppressing change notifications. Fix 3 Reimplement Observable. Collection. Create your own collection that implements INotify. Collection. Changed. Raise INotify. Collection. Changed as sparingly as you can. Raise the event with a Notify. Collection. Changed. Action. Reset event for anything more trivial than a simple single item add, remove, change, or move. Do not take advantage of the Notify. Collection. Changed. Event. Args constructors that take collections of items you will find support for it spotty at best. Implement System. Collections. IList on your collection. WPF does not use the generic System. Collections. Generic. IListlt T interface it is completely ignored. If you dont implement the interface, WPF will perform almost all operations including accessing rows by number strictly by the IEnumerable implementation, and it wont be very optimal or fast about it. Probably implement System. Collections. Generic. IListlt T as well. WPF doesnt use it, but you probably will through LINQ, Rx, etc. V. Avoid Dynamic. Resources. Even in. NET 4. 0, Dynamic. Resource access is still slower than Static. Resource access. And worse, once you start nesting Dynamic. Resources for example, a List. View whose Style contains a Control.