I have TabControl bound directly to IEnumerable<ViewModelBase> (different ViewModels), rendered using DataTemplates. BUT when switching Tabs, one can se that TabItems are completely redrawed and it's soooo slow. Is it normal???
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Cartesius00
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How complicated are the `DataTemplates`? Do you have everything in the `DataTemplate` or does the `DataTemplate` only contain a `UserControl` and is used to match that up to the ViewModel? – Joel B Fant Jun 06 '11 at 05:16
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Problem solved! It was the lazy-loading of some attributes. – Cartesius00 Jun 06 '11 at 14:04
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So what was the solution? – Scott Solmer Oct 07 '19 at 14:45
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Is your data context truly exposing an IEnumerable<T> as the binding source? If so, I recommend you take a look at How Data Binding References are Resolved. This won't explicitly address the redraw issue, but if you expose your view models data source using a collection that supports the INotifyPropertyChanged interface such as ObservableCollection or a ICollectionView data source, you will get better binding and rendering performance.
On the redraw side of this issue, you should take a look at this Dr. WPF post. There is a proposed solution to the performance issue you are seeing, and to go one step further you would write a TabControl subsclass, and possibly use a VirtualizingStackPanel as the items source of the custom TabControl.
This article goes over the UI and data virtualization options you might try.
Oppositional
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I would say yes, DataTemplates are blueprints of how to construct objects, so your TabControl might very well throw the old tab content and and create a new one if you switch tabs. Possibly this question is related.
(Even though people have complained before about the behaviour that the TabControl may actually reuse objects, i suppose this could depend on the underlying type of the items)
