Muhammad Shujaat Siddiqi: WPF: Configuring System.Runtime.Caching.MemoryCache for an MVVM based App. This is a continuation of our post here: In the above post we discussed how we can use the new caching feature available in .net framework 4.0 to improve the performance of a WPF application. As an example we used an application implementing MVVM pattern. In this example we would extend the example by discussing how we can use configuration option provided with this caching feature.
We would also look at the underlying architecture provided by the framework to support this. As we discussed in the previous example, the framework has provided MemoryCache. In order to use this you need to add a reference of System.Runtime.Caching assembly from the framework. Yes I have Power Tools installed :). The view is expecting certain properties from MainWindowViewModel which is used as its DataContext. Loading Default Memory Cache with Configuration Options: The configuration of default MemoryCache is easy.
System.Runtime.Caching (Espacio de nombres) () WPF 4: Using Enterprise Library 5.0 Caching Block in WPF application. Posted by: Mahesh Sabnis , on 3/15/2011, in Category WPF Abstract: In this article, I will demonstrate how to use the Enterprise Library 5.0 Caching Application block in a WPF application. Enterprise Library 5 provides a collection of reusable application blocks which helps developers to deal with challenges in .NET enterprise application development. Enterprise library provides support for design patterns implementation, giving a framework to developers to design and develop code which collaborates classes, objects, services etc. in an application.
In this article, we are using Enterprise Library 5.0, which can be downloaded from here. There are a lots of changes introduced in this v5 release. For details on this release, you can download the documentation and go through it. In this article, I have used the Caching Application block provided in Enterprise Library 5.0. As you can see, the cache data is stored in the local memory. Step 1: Open VS2010 and create a WPF application. Tutorial: Almacenar en caché datos de la aplicación en una aplicación de WPF. VirtualizingStackPanel (Clase) (System.Windows.Controls)
Optimizar el rendimiento: Comportamiento de objetos. Optimizar WPF: Rendimiento de aplicaciones. WPF Data Virtualization. The DevZest Blog | WPF Data Virtualization. Introduction In a typical WPF + WCF LOB application, displaying and interacting a large data set is not a trivial task. While several posts on internet forums discuss data virtualization, none of them has all the following: Selection, sorting and filtering works well as if all data are stored locally; Data loading as needed, in a separate thread, without blocking the UI; Visual feedback when data is loading; if failed, user can retry the last failed attempt.
The attached source code contains a highly reusable component which resolves all the above issues, together with a demo WPF application. Built-in WPF UI Virtualization First of all, your UI should only demand data items actually visible on screen. Make the number of UI elements to be created proportional to what is visible on screen using VirtualizingStackPanel.IsVirtualizing="True". For more information, please read this post. VirtualList<T> & VirtualListItem<T> You can data binding VirtualListItem<T> just like any other object. License. VirtualizationMode Enumeration (System.Windows.Controls) Public enum VirtualizationMode The following example shows the data used in the previous example. public class LotsOfItems : ObservableCollection<String> { public LotsOfItems() { for (int i = 0; i < 1000; ++i) { Add("item " + i.ToString()); } } } .NET Framework Supported in: 4.5.1, 4.5, 4, 3.5 SP1, 3.0 SP2 .NET Framework Client Profile Supported in: 4, 3.5 SP1 Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
Bea.stollnitz.com/files/52/DataVirtualization.pdf. In our previous blog post, we mentioned some of the challenges developers face in creating keyboard-friendly applications, and we presented our FocusWatcher class for debugging these issues in Windows Store apps. The keyboard is just one way an app may receive input; Windows Store apps can also get input from mouse, stylus, and of course, touch. Modern tablets and touch screens often support multiple simultaneous touch inputs, in fact. All these different inputs can make it tough for developers to figure out what’s going on, especially when combining… WPF: Data Virtualization. Download source code - 15.7 KB Introduction WPF provides some clever UI virtualization features for dealing efficiently with large collections, at least from a UI perspective.
What isn’t provided is a generic method for achieving data virtualization. While several posts on internet forums discuss data virtualization, no one has (to my knowledge) published a solution. Background UI Virtualization When a WPF ItemsControl is bound to a large collection data source, with UI virtualization enabled, the control will only create visual containers for the items that are actually visible (plus a few above and below). UI virtualization means that controls can be bound to large collections without incurring a large memory footprint due to visual containers. Data Virtualization Data virtualization is a term that means achieving virtualization for the actual data objects that are bound to the ItemsControl. Solution Overview IItemsProvider<T> VirtualizingCollection<T> AsyncVirtualizingCollection<T> Update. Bea Stollnitz » Data virtualization.
Jul 26, 2009 My last post covered the current UI virtualization support on Silverlight and WPF. In this post, I will discuss another technique that helps improve performance when dealing with large data sets: data virtualization. A control that uses data virtualization knows to keep in memory no more data items than the ones needed for display. For example, if a data-virtualized ListBox is data bound to 1,000,000 data items and only displays 100 at a single point in time, it only keeps about 100 data items in memory. If the user scrolls, the data-virtualized ListBox knows to swap the items in memory in a way that optimizes performance and memory consumption. I talked about a possible solution that provides partial data virtualization for TreeView in a previous post. Data virtualization in WPF WPF has no built-in generic support for data virtualization. The implementation details are quite different, though (this is expected – neither of them was aware of the other one’s work).
Caching Summary. Bea Stollnitz » UI Virtualization. Jul 11, 2009 Today’s post is motivated by a scenario that’s common in business applications: displaying and interacting with a large data set. We’ll quickly run into performance problems if we use the naïve approach of loading the entire data set into memory and creating UI elements for each data item. Fortunately, there are some things we can do to make sure our applications perform well, even with extremely large data sets. The first approach is called “UI virtualization.” The second approach, called “data virtualization,” goes one step further. In this post, I will talk about the current level of support for UI virtualization in Silverlight and WPF. UI virtualization in Silverlight Silverlight 3 just shipped! It was possible to work around the lack of UI virtualization before (in fact, I wrote a virtualized ListBox in Silverlight a year ago), but it wasn’t straightforward.
UI virtualization in WPF WPF has supported UI virtualization for a long time. Container recycling Deferred scrolling. VirtualizingStackPanel Class (System.Windows.Controls) Arranges and virtualizes content on a single line that is oriented either horizontally or vertically. public class VirtualizingStackPanel : VirtualizingPanel, IScrollInfo <VirtualizingStackPanel> Children </VirtualizingStackPanel> The VirtualizingStackPanel type exposes the following members. The following example shows the data used in the previous example. public class LotsOfItems : ObservableCollection<String> { public LotsOfItems() { for (int i = 0; i < 1000; ++i) { Add("item " + i.ToString()); } } } .NET Framework Supported in: 4.5.1, 4.5, 4, 3.5, 3.0 .NET Framework Client Profile Supported in: 4, 3.5 SP1 Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported) Any public static (Shared in Visual Basic) members of this type are thread safe.