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Posted by / 06-Jul-2017 07:45

Asynchronous updating

This topic describes asynchronous programming in the Universal Windows Platform (UWP) and its representation in C#, Microsoft Visual Basic .NET, Visual C component extensions (C /CX), and Java Script.When you implement these asynchronous patterns in your own API definitions, callers can understand and use your code in a predictable way.Here are some common tasks that require calling asynchronous UWP APIs.Use a background task to update your app's live tile with fresh content. Here's a video that shows how to add live tiles to your apps. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site. In a previous article on async and await, I showed a very simple example of how to run some code asynchronously.

Whilst I was in the code base, I wanted to try and improve some of this unresponsiveness by moving code out into tasks and asynchronously updating the UI. Whilst the application is counting, the user interface becomes completely unresponsive. This is the issue I have been facing in this application that I need to maintain.

Sometimes it is not necessary to update the user interface that quickly. Send is a synchronous operation and will wait for an answer or action completed from the call, where as Post is asynchronous where it makes the call to the UI thread and continues without waiting for a reply.

In this example it wouldn’t appear to make much difference which of the 2 you use, but we have used Post as we do not require to wait for a reply as we are just posting some data to be shown on the screen.

In this article, I want to take this a little further with another example.

I have recently had to go and maintain an old c# Winforms application (yes I know winforms is a little old and considered the new vb6 but the application works and still provides value) that needed some new features adding. w=287" class="size-full wp-image-1856" src="https://stephenhaunts.files.wordpress.com/2014/10/async-application.jpg? w=750" alt="Simple Application for an Async and Await Example" srcset="https://stephenhaunts.files.wordpress.com/2014/10/287w, https://stephenhaunts.files.wordpress.com/2014/10/async-application.jpg?

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Implement the IBackground Task interface to create a class that updates your app's live tile. In this case, the task gets a syndication feed for the MSDN blogs.