Dynamically updating treeview node wpf america dating site in usa
In many situations the developer just needs to bind the Tree View directly to the Data Set which was populated with database data; creating custom domain objects and collections of those objects can be overkill sometimes.
If you are currently in that situation, rest assured that it is actually fairly trivial to do this in WPF.
When you run the demo application and expand the root nodes, the Tree View looks like this: Click here to download the demo project.
Once the edit behavior is enabled, you can start the editing process by selecting the item and pressing the F2 key.
Figure 2 shows the three classes that will be necessary for expressing a hierarchy of Employee Type objects of which each Employee Type object can hold one or more Employee objects. The last class you create is collection class called Employee Types created using the generic List class. In the constructor of the Employee Types collection class, you build the collection of Employee Type objects and fill each one with Employee objects, as shown in Listing 1.
Here is the XAML for a Window which contains a Tree View configured to load and display that data: If you had, say, three related tables (Master – Detail Info) then you could have the ‘Detail Template’ be a Hierarchical Data Template whose Items Source was bound to the Data Relation between ‘Detail’ and ‘Detail Info,’ and the Item Template a Data Template which displays the pertinent information in that table.
Sheriff is a Business Solutions Architect with Fairway Technologies, Inc. There are many examples of using the Windows Presentation Foundataion (WPF) Tree View that you can find on the Web, however, most of them only show you how to go to two levels. This is where it’s vital to understand exactly how the Hierarchical Data Templates work.
Fairway Technologies is a premier provider of expert technology consulting and software development services, helping leading firms convert requirements into top-quality results. 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.
The technique presented herein could easily be extended to fit more sophisticated requirements, such as binding to more than two tables.
Many applications need to display hierarchical data in a Tree View, and often that data is retrieved from a database.
In case your data item is a complex object as shown in the above example, you must handle the Tree View Item's Enter Edit Mode and Exit Edit Mode event: In order for the Tree View Item to update its UI after you modify the data object, your data object should usually implement INotify Property Changed interface.