Best way to create pages

Question

Hi,
i have an application that contain several usercontrols that represent pages wich the user can navigate between .
what i want is to create all these pages at application start ,while showing  a splash screen for example .
and the application would be responsive , so i have to load all the pages in async  way.
so i am looking for some guidance on the best way to do that, small snippets could help too ;)
thanks and good day

Answer 1

The UserControl themselves should be created on the UI thread like any other UI elements but you should move any long-running data retrieval code
in the UserControls to a background thread. You could do this by starting a new Task:
public partial class UserControl1 : UserControl
public UserControl1() {
InitializeComponent();
System.Threading.Tasks.Task.Factory.StartNew(() =>
//do this on a background thread...
.ContinueWith((t) =>
//do this when you are back on the UI thread
}, System.Threading.CancellationToken.None, System.Threading.Tasks.TaskContinuationOptions.None, System.Threading.Tasks.TaskScheduler.FromCurrentSynchronizationContext());
The UI will then remain reponsive during the time it takes for the code that runs on the background thread to complete.
>>what i want is to create all these pages at application start ,while showing  a splash screen for example .
Why? Creating all Pages/User Controls at once when the application starts sounds like a bad idea since you have to create the actual Pages/UserControls on the UI thread. You should probably create a page when it is needed instead of creating all
pages before hand.
For more information about how to display a splash screen, which is nothing more than an image that is displayed before the MainWindow of your application is up an running, please refer to the following page:
https://msdn.microsoft.com/en-us/library/cc656886(v=vs.110).aspx
This link could also be helpful:
http://www.codeproject.com/Articles/3542/How-to-do-Application-Initialization-while-showing
Anyway, creating the actual start up window and its Contents is always done on the UI thread and this should be done quickly. Bit make sure that you move any long-running code inside the window or UserControls to a background thread.
Also remember that you should always create and access any visible UI elements (UserControls, Buttons, TextBlock, etc.) on the UI thread and not from a background thread.
Hope that helps.
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