4/3/2024 0 Comments Wpf dynamic treeview example cHow and from where you retrieve the data is not important for this article. You want to retrieve data from a database table or an XML file and build the TreeView dynamically. You don't want to use hard-coded XAML in your WPF application. įigure 1 shows you how this TreeView looks when you run the WPF application.įigure 1: A hard-coded two-level TreeView Create Hierarchical Classes to Mimic Your TreeView To start, let's look at the typical two-level WPF TreeView that has been hard-coded with the values shown in the following code snippet. In this article, I'm going to break down how these templates work, so you can really understand what's going on underneath the hood. What if you have more than two levels? This is where it's vital to understand exactly how the HierarchicalDataTemplates work. There are many examples of using the Windows Presentation Foundataion (WPF) TreeView that you can find on the Web, however, most of them only show you how to go to two levels. Colin Eberhardt reviews iOS Programming for.How do we implement this in the WPF Tree View? How can we achive this funcionality of binding the dynamic hierarical multi level dataset to TreeView?Īfter binding the above result set, the Tree View data needs to be displayed in the below format. The below result set contains all the top level data with NULL ParentDataID data & all the child records has the ParentDataID field data as the pointer to its parent data.īased on the below dataset structure, we have a requirement to bind the resultset with the multi level hierarical data to the TreeView control. For multilevel hierarchical data binding to a WPF tree view control, I have a stored procedure that returns result set in the below mentioned order. DataID field is the FK of ParentDataID field. I have a DB table which is self referenced. Be sure to change the file extension from DOC to ZIP and then unzip it. When you run the demo application and expand the root nodes, the TreeView looks like this:Ĭlick here to download the demo project. If you had, say, three related tables (Master –> Detail –> DetailInfo) then you could have the ‘DetailTemplate’ be a HierarchicalDataTemplate whose ItemsSource was bound to the DataRelation between ‘Detail’ and ‘DetailInfo,’ and the ItemTemplate a DataTemplate which displays the pertinent information in that table. Here is the XAML for a Window which contains a TreeView configured to load and display that data: We want a TreeView to display the Master rows as top-level nodes and the Detail rows as children of their respective parent node. The resultant DataSet has two DataTables (‘Master’ and ‘Detail’) and one DataRelation (‘Master2Detail’). Here is a method in a class called DataSetCreator which creates a DataSet with two related DataTables: You need to use a HierarchicalDataTemplate for every non-leaf level of nodes, in other words, only the very lowest DataTable in the hierarchy is displayed with a non-hierarchical DataTemplate. The basic gist of the solution is to bind the top level of TreeViewItems against the master DataTable, and then bind against DataRelations for any descendants of the root nodes. If you are currently in that situation, rest assured that it is actually fairly trivial to do this in WPF. In many situations the developer just needs to bind the TreeView directly to the DataSet which was populated with database data creating custom domain objects and collections of those objects can be overkill sometimes. Many applications need to display hierarchical data in a TreeView, and often that data is retrieved from a database. The technique presented herein could easily be extended to fit more sophisticated requirements, such as binding to more than two tables. This blog entry demonstrates the fundamentals of binding a WPF TreeView to a DataSet with two related DataTables.
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