Ever wish you could use an animated gif in your WPF application? Well, here is an easy way to do so. Simply use the WpfAnimatedGif Nuget package available on codeplex. With that library, you can easily display animated GIFs in your application via XAML or code.
Here is what the markup looks like…
…
xmlns:a=http://wpfanimatedgif.codeplex.com
…<Image a:ImageBehavior.AnimatedSource="Images/myImage.gif"/>
Head over to http://wpfanimatedgif.codeplex.com/ for more info.
Happy Coding!
Just a quick post to show you how to iterate through resource dictionary entries when using merged resource dictionaries. It is fairly straight forward. I came across someone wondering how to do this, so I thought I’d share. You simply iterate through all your merged dictionaries and then iterate through each dictionary entry in the dictionary. Here is the code below.
foreach (ResourceDictionary dict in Application.Current.Resources.MergedDictionaries)
{
foreach (DictionaryEntry entry in dict)
{
//Process entry
}
}
Hope this helps.
If you are new to Windows Store app development, you may be wondering how to show a simple dialog. It used to be so easy. You simply called MessageBox.Show() and you had a dialog. Well, in Windows Store Applications in Windows 8, it is a bit different but just as easy.
Try this code instead of MessageBox.Show to get the following dialog…
var messageDialog = new Windows.UI.Popups.MessageDialog("Message Text.","Message Header");
messageDialog.ShowAsync();
Happy Windows Store App Coding!
A common task in UI development is setting the focus on a textbox when navigating to a particular screen. When doing this on a Windows 8 application, a lot of developers try to do this inside the OnNavigatedTo event handler. This does not work. To set the focus on a textbox when the page is hit, call the focus method on the particular textbox inside the loaded event handler… That should do it.
<common:LayoutAwarePage
x:Name="pageRoot"
…
Loaded="pageRoot_Loaded_1">
private void pageRoot_Loaded_1(object sender, RoutedEventArgs e)
{
this.txtName.Focus(FocusState.Programmatic);
}
Hope this helps. Happy Coding!
I am working on an application where I have a ContentControl, and I need to know when the content changes. My initial thought was to add an event handler for the ContentChanged event. I came to find out that the ContentControl does not fire a ContentChanged event.
My solution was to create a control derived from content control that fires that particular event. It is working quite nicely, so I thought I would share. I hope it helps you out. It’s a small amount of code, but it does the trick.
public class ChangeAwareContentControl : ContentControl
{
static ChangeAwareContentControl()
{
ContentProperty.OverrideMetadata(typeof(ChangeAwareContentControl),
new FrameworkPropertyMetadata(
new PropertyChangedCallback(OnContentChanged)));
}
private static void OnContentChanged(DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
ChangeAwareContentControl mcc = d as ChangeAwareContentControl;
if (mcc.ContentChanged != null)
{
DependencyPropertyChangedEventArgs args
= new DependencyPropertyChangedEventArgs(
ContentProperty, e.OldValue, e.NewValue);
mcc.ContentChanged(mcc, args);
}
}
public event DependencyPropertyChangedEventHandler ContentChanged;
}
Here is how you use it in xaml.
<controls:ChangeAwareContentControl ContentChanged="ContenChangedHandler"/>
A very common error new UI developers make is trying to create new BitmapImages without properly initializing them.
All property changes made to a BitmapImage must be made between the BeginInit() and EndInit() calls. Every property change made after the EndInit() call is ignored.
Here is a small code snippet on how to properly create a new bitmap image and set that as the source of an Image object.
// Define a BitmapImage.
Image myImage = new Image();
BitmapImage bi = new BitmapImage();
// Begin initialization.
bi.BeginInit();
// Set BitmapImage properties. (CacheOption,CreateOptions… etc.)
// End initialization.
bi.EndInit();
myImage.Source = bi;
If you programmatically select an item on a WPF datagrid, you may need to scroll to make sure that item is visible. One line of code will take care of that for you.
myGrid.ScrollIntoView(myGrid.SelectedItem);
That should do it.
Happy Coding!
