WPF/ XamDataGrid Performance, Infragistics Seminar, Israel , November 2011

WPF/ XamDataGrid PerformanceKiril MatevTechnical EvangelistInfragistics, Inckmatev@infragistics.com

Contents• Application Resources• Layouts & Templates• Data Binding• Converter vs. DataTemplateSelector• XamDataGrid-specific optimizations – UI Virtualization – Themes and styles – Real-time updates• Initial Loading Time (preloading and NGEN)

Application Resources• Load relevant resources at the view level (as opposed to on the application level)• Use shared resource definitions on the Window/Application level• Use static resources rather than dynamic ones to save on lookups at runtime

Layouts & Templates• Reduce the number of visual elements• Use virtualized container with recycling• Refrain from using BitmapEffects• Set the neutral culture using NeutralResourcesLanguageAttribute to prevent lookup of satellite assemblies

Data Binding• Fix binding errors to prevent expensive binding path resolutions• Binding to many properties of an object is expensive compared to binding to few properties of many objects• Test with 1000 textboxes – Bound to 1 object’s 1000 properties – 950ms – Bound to 1000 objects 1 property – 115ms

Data Binding• Bind to IList rather than IEnumerable, because the CLR generates an IList to wrap it• For adding/removing data from data sources, bind to ObservableCollection<T> rather than IList

Convertor vs DataTemplateSelector• Use Convertors instead of DataTemplateSelectors – Added flexibility in specifying business logic – Slightly better performance• For virtualized control, the convertors will be invoked for each cell coming into view,• Apply processing in code-behind and bind to transformed/formatted data

Convertor Limitations• For virtualized item controls, the conversion logic will be invoked for each cell coming into view• Avoid unbound columns and convertors - apply processing in code-behind and bind to transformed data• Apply formatting using styles rather than converters, e.g. date or time formatting

XamDataGrid UI Virtualization• XamDataGrid supports virtualization modes on the row and column level to help you adjust performance for your specific scenarios• You can customize the virtualization setting using the RecordContainerGenerationMode and CellContainerGenerationMode properties

XamDataGrid Virtualization Modes• Recycle – Reuses the same visual elements, binding them to data items as they are scrolled into view – Minimize space requirement at the expense of time – Suitable for high-volume data scenarios with simple UI controls in the cells

XamDataGrid Virtualization Modes• PreLoad – Initialize visual elements to represent the entire dataset – Improve runtime performance at the expense of space and startup time – Useful when you require smooth scrolling over a relatively small dataset, and you have user controls hosted in the control with expensive initialization/formatting applied

XamDataGrid Virtualization Modes• LazyLoad – Initialize visual elements to represent the visible dataset, adding new ones to represent data subsequently brought into view – Minimum space at startup, increasing space footprint, accessing cells that have been in view is fast – Useful when you require smooth scrolling over a relatively small dataset, and you have user controls hosted in the control with expensive initialization/formatting applied

XamDataGrid Event Suppress• Suppress unused routed events to improves performance due to the overhead incurred with routed events in element hierarchies.• There are also direct CLR events added for common routed events on the DataPresenterBase.

XamDataGrid Themes & Styles• Set the Theme property to prevent overhead in template lookup – Implications for preloading• Use a hover-less theme to prevent row highlighting on mouse hover

XamDataGrid Real-Time Updates• Using INotifyPropertyChanged on the property level (usual MVVM setup) – Useful for sparse updates, good for most cases – One event updates one bound column• Using INotifyPropertyChanged on the row level – Useful for scenarios where all the properties in a row are changed. This updates the entire row using a single property changed notification, instead of raising N property changed events – One event updates an entire row

XamDataGrid Real-Time Updates• Using CollectionChanged.Reset for frequent and extensive data updates – Useful for scenarios where the underlying datasource changes dramatically – e.g. a new batch of rows come in from a backend system – One event updates the entire grid

XamDataGrid ReadOnly Style• Using the read-only cell style (provided on my blog), you can get a radically simpler CellValuePresenter style, which improves performance• It does not render editors for cells in edit mode,• Setting EditAsType the same type for all XamDataGrid fields facilitates cell virtualization

Initial Loading Time - Preloading• Preloading XamDataGrid (and any other Infragistics controls) in a window not shown to the user pays upfront the cost of JIT-compiling the XamDataGrid• This causes user-initiated opening of a window containing the XamDataGrid to be much faster• Approach is described here

Initial Loading Time - NGEN• The JIT compiler compiles methods as required during execution – Takes up CPU time – Compiled code cannot be shared among processes

Initial Loading Time - NGEN• Using NGEN to create pre-compiled (native) images of Infragistics DLLs to eliminate JIT- compilation – Reduces the memory footprint • JIT compiler does not need to be loaded in memory) • Native images can be shared among processes – Improves loading time in warm startup scenarios Note: NGEN’ed assemblies need to be in the GAC on the client machine in order to avoid costly strong-name validation procedure.

Questions

ResourcesOptimizing XamDataGrid performancehttp://blogs.infragistics.com/blogs/kiril_matev/archive/2010/10/26/optimizing-xamdatagrid-performance.aspxOptimizing WPF Application Performancehttp://msdn.microsoft.com/en-us/library/aa970683.aspx

Contactskmatev@infragistics.com

WPF/ XamDataGrid Performance, Infragistics Seminar, Israel , November 2011

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WPF/ XamDataGrid Performance, Infragistics Seminar, Israel , November 2011 Presentation Transcript