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. The WPF TreeView is indeed a complex control. 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. Each node can then have child nodes, and the child nodes can have child nodes and so on. 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. TreeView introduction The TreeView control enabled you to display hierarchical data, with each piece of data represented by a node in the tree. If you are currently in that situation, rest assured that it is actually fairly trivial to do this in WPF. It will then allow the user to drag it from side to side or up and down, while changing the size of the column or row on each of the sides of it. The GridSplitter is used simply by adding it to a column or a row in a Grid, with the proper amount of space for it, e.g. 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. This is where the GridSplitter control comes into play. Many applications need to display hierarchical data in a TreeView, and often that data is retrieved from a database. The way TreeView was designed to be used is following the MVVM design pattern. There are basically two ways to work with these controls, one that makes dynamically changing trees easy to manage, and one that makes completely static trees trivial to setup. The technique presented herein could easily be extended to fit more sophisticated requirements, such as binding to more than two tables. The TreeView in WPF is an extension of ItemsControl. I hope you have enjoyed it a lot.This blog entry demonstrates the fundamentals of binding a WPF TreeView to a DataSet with two related DataTables. In the above code example, we saw how to do WPF TreeView Binding with hierarchical structure. The XAML describes how to populate the data source fields and the c# code describes how to bind a list of items (data source ) to Treeview. The above code examples described binding the data source to Treeview. WPF TreeView Binding MainWindow.cs Code List emps = new List() Įmps.Add(new Employee() ) The below code examples shows to bind the data source to Treeview. To define the layout of a TreeViewItem control, you can also use HierarchicalDataTemplate objects. The ItemsSource can be specified for TreeView control as a data source and then specify a HeaderTemplate and ItemTemplate to define the TreeViewItem content. Here we will see in code examples of how to bind the data source to WPF Treeview ItemsSource using C# and populate fields from the data source in Treeview. In my previous blog ( WPF TreeView Example) described how to create a simple WPF TreeView, hierarchical Treeview, customize the default Treeviewand styling the Treeviewto change the appearance. The ItemsSource can be specified for TreeView control as a data source, here this blog provides code examples of how to bind the data source to WPF Treeview with hierarchical structure in WPF.