Showing posts with label WPF. Show all posts
Showing posts with label WPF. Show all posts

Thursday, 18 April 2013

MVVM - Binding to TreeView.SelectedItem

At first, binding to the TreeView's SelectedItem property sounds like a simple task, but if you give it a go you will soon realise it's not so straight forward. That's because the WPF TreeView's SelectedItem property is read-only so we can't set the binding in XAML like normal.

Thursday, 11 April 2013

WPF - Different Data Templates for Different Child Types in a TreeView

The TreeView control in WPF allows us to display hierarchical data and allows us to customise the appearance of this by setting the ItemTemplate property using a HierarchicalDataTemplate, giving us expandable nodes within our tree. However, we can only set the ItemTemplate property once with one data template. Imagine the scenario where you want to display a directory structure. A directory can contain files or other directories which in turn can also contain files or other directories and so on. You might want to use a different data template for files than for directories but as stated earlier you can only set the ItemTemplate property once, so how can we achieve this?

Tuesday, 2 April 2013

CallerMemberName .NET 4.0

After writing my recent post about a basic ViewModelBase implementation, the discussion about the CallerMemberNameAttribute got me thinking... how hard would it be to write my own implementation of this attribute?

Monday, 1 April 2013

MVVM - ViewModelBase

If you are developing a WPF application then you really need to be using the MVVM(Model-View-ViewModel) design pattern. I'm sure the vast majority of prospective employers searching for a WPF developer well expect some familiarity with MVVM. I'm not going to spend hours explaining this design pattern as many people have already done that rather well such as here and here.

Saturday, 30 March 2013

WPF - Find Parent by Type

Building on from my earlier post here I thought I'd show how we can use VisualTreeHelper to go the other way up the tree and find a parent of a specified type.

Thursday, 28 March 2013

WPF - Find Child by Type

WPF provides the VisualTreeHelper class which exposes a few static methods that help us to navigate the visual tree more easily. However, the existing methods don't provide any specific methods for searching the visual tree for a particular element type.