How to develop treeview with checkboxes in wpf?

Question

I have a requirement that , i need to add nodes to treeview dynamically and that nodes with checkboxes. If one checkbox is selected childs also selected.

And mainly i want to add data to treeview Dynamically

Answer 1

This is remarkably straightforward to do, once you know how.

Create a view model class (I've called it CheckableItem here) for your tree view item data. It needs these three things:

• It must implement INotifyPropertyChanged.
• It needs a Children property of type ObservableCollection<CheckableItem>.
• It needs an IsChecked property of type Visibility that, in its setter, raises PropertyChanged and also iterates through the items in Children and sets their IsChecked property.

Implement other properties in this class to expose the items' data to binding (my example just assumes something called Value). Or you can just implement an Item class of type object and use a ContentPresenter in the template, but I'll leave figuring that out to you.

Now create a HierarchicalDataTemplate for your class that looks something like this:

<HierarchicalDataTemplate
    DataType="{x:Type local:CheckableItem}" 
    ItemsSource="{Binding Children}">
    <StackPanel Orientation="Horizontal">
        <Checkbox IsChecked="{Binding IsChecked}"/>
        <TextBlock Text="{Binding Value}/>
    </StackPanel>
</HierarchicalDataTemplate>

...and a TreeView that uses it (I'm assuming you've populated a collection of these objects, of course):

<TreeView ItemsSource="{Binding MyCollectionOfCheckableItems}"/>

How it works: The TreeView uses the HierarchicalDataTemplate to render each item in its ItemsSource. The HierarchicalDataTemplate is a template that creates a HeaderedItemsControl (in this case a TreeViewItem), uses its template to render the header, and then uses its ItemsSource as the source for the control's items - which, since they're all CheckableItems, are turned into TreeViewItems by the HierarchicalDataTemplate. After that, it's turtles all the way down.

This is a pretty good overview of how TreeView actually works in practice, though as with most examples I've found, it's got so many bells and whistles that it's sort of hard to see how simple the underlying principles are. If you understand MVVM, the previous paragraph is 90% of what you need to know.