C treeview example wpf
This defines a DataType and then the ItemSource as the collection within the DataType. A TreeView.Resources sits inside in which we define a HierarchicalTemplate. We define a TreeView & bind the ItemSource to our ItemsA. In the real world these lists are replaced with your queried data from the Database, Json, Xml etc:įinally our Xaml designer view. The ViewModel instantiates a collection of ItemA class objects, ItemA defines a collection of ItemB’s in the constructor & ItemB defines a list of ItemC. To acheive this we need to put our OOP hat on & build a hierarchy of classes to provide the TreeView with our data at run time. If you don’t know what to expect at run time then we can’t hard code the values, we need a dynamic TreeView! The left side bar of Windows Explorer is an example of a TreeView. When TreeViewItem is expanded, the vertical line will hide: <. This is fine unless you have dynamic data. 848.3k 0 18 WPF TreeViewTutorial.zip Introducing WPF TreeView A TreeView represents data in a hierarchical view in a parent child relationship where a parent node can be expanded or collapsed. All you need to do is a XAML file and a code behind: First you need draw Toggle Button: From Triangle button to Plus-Minus button: draw a rectangle with dark border, then draw two lines, one vertical line and one horizontal line. You could also bind these values to string property values exposed in your viewModel. TreeViewItems are nested within the TreeView & Headers are hardcoded. Hard coding your values is simple enough however I quickly learned that building a dynamic hierarchical TreeView was to be a little more complex!įirstly, here’s some simple hard coded Xaml: I got about using WPF’s TreeView control. I recently had a UI design which required the use of a tree view.