Then used as the items source for the TreeView. In the code-behind, we simply create two Family instances, fill each of them with a set of members, and then add each of the families to a list, which is In both templates, we use an image representing either a family or a family member, and then we show some interesting data about it as well, like theĪmount of family members or the person's age. Had wanted each FamilyMember to keep a collection of their children and perhaps their children's children, then we would have used a hierarchical template The template defined for the FamilyMember type is a regular DataTemplate, since this type doesn't have any child members. ![]() The template defined for the Family type is a hierarchical template, using the Members MenuItem root = new MenuItem() Īs mentioned, the two templates are declared as a part of the TreeView resources, allowing the TreeView to select the appropriate template based on theĭata type that it's about to show. Public partial class TreeViewDataBindingSample : Window ![]() Namespace WpfTutorialSamples.TreeView_control In the following example, I'll show you just how easy it is to get started with the HierarchicalDataTemplate: Which property to use as a source for child items of the node. Instead, we use the HierarchicalDataTemplate, which allows us to template both the tree node itself, while controlling The WPF TreeView supports data binding, like pretty much all other WPF controls does, but because the TreeView is hierarchical in nature, a normalĭataTemplate often won't suffice. The TreeView control: TreeView, data binding and multiple templates Colin Eberhardt reviews iOS Programming for.How do we implement this in the WPF Tree View? AutoCompleteTextBox is user control defined in SharpDevelop. 1 StasBZ The code is just an example, its not supposed to be blindly copy and pasted. Unknown object local:AutoCompleteTextBox Stas BZ. 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. How does it work for somebody who can use WPFs standard TreeView ygoe. 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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