![]() ![]() They make the control more complicated than the WinForms TreeView. Those excellent features come at a price. In contrast, the WPF TreeView is extremely flexible, inherently supports UI virtualization (i.e., TreeViewItems are created on-demand), allows for full visual customization, and has full support for data binding. The WinForms TreeView is “good enough for government work”. That simplicity arises from the fact that the Windows Forms TreeView is completely inflexible, offers no support for UI virtualization, offers zero possibility for visual customizations, and since it does not support data binding, it requires you to store data in its nodes. In Window Forms, it is very easy to use the TreeView control because it is dead simple. This is yet another example of how WPF requires you to shift mental gears to make use of the platform appropriately. In order to leverage the extensive features of the WPF TreeView, you cannot use the same programming techniques as in Windows Forms. The problem is that people often try to use it in the same way that one might code against the Windows Forms TreeView control. Many people try to use it, and find it to be exceedingly difficult. The TreeView control in WPF has gained an undeserved bad reputation. ![]() One of the demos shows how to create a searchable TreeView, the other demonstrates how to implement lazy-loading (a.k.a. Along the way, we examine why people often have difficulty with the WPF TreeView, what a ViewModel is, and two demo applications that show how to combine a TreeView with a ViewModel. This article explores how to use the ViewModel pattern to make it easier to work with the TreeView control in WPF. Download the source code (requires Visual Studio 2008) - 28.6 KB. ![]()
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