C# on DVLUP

Custom TypingStarted and TypingEnded Events

Thu, 02 Jan 2020 00:00:00 +0000

You know that little indicator in a chat that shows if someone is currently typing? I am working on a new post (coming soon, link will be here) that uses SignalR to communicate who is currently typing in a chat room along with the messages themselves.

To determine who is typing, I use a timer and the TextChanged event. The timer logic itself is straightforward, in the TextChanged event starts a timer.

Draw Your Own Xamarin Pie Chart dynamically

Thu, 18 Apr 2019 00:00:00 +0000

In this tutorial, I’ll show you how to draw your own pie chart just using lines and a list of data items. The code itself is in C#, but the concept can be used on any platform that has a drawing library and ArcSegments.

You can view the entire solution in this GitHub Gist . Okay, let’s get started!

Setting Up

The first thing you’ll need to understand is how the platform’s drawing library makes arcs. In this code, I’ll be using RadPath from Telerik UI for Xamarin most libraries work the same way. RadPath lets you use a custom Geometry which has RadArcSegment object, which has helpful StartAngle and SweepAngle properties.

Talk to the View

Tue, 16 Apr 2019 00:00:00 +0000

There are many scenarios where a UI component might not have a Command or bindable property available for certain features that you need to access from the view model. There is a simple, but powerful, thing you can do to allow this and not break MVVM or testing capability, leverage the Interface.

Scenario

Let’s imagine the scenario where we have a special ListView control that has a HighlightItem method that can only be called with a direct reference to that control. There isn’t a Command or DependencyProperty (aka BindableProperty in Xamarin.Forms) alternative, so it has to be done in the code behind.

Migrating from PCLStorage to .NET Standard 2.0

Thu, 19 Apr 2018 00:00:00 +0000

If you’re a Xamarin Forms developer, you’ve likely used PCLStorage (or other Dependency Service) to interact with the target platform’s file system in the portable class library’s code. However, since November 2017, Xamarin.Forms now uses a .NET Standard 2.0 class library and PCLStorage is no longer supported.

System.IO.File

This isn’t a problem because in .NET Core 2.0 you now have access to System.IO.File’s GetFolderPath and SpecialFolder methods (see System.IO.File in .NET Core 2.0 docs ).

Denied?

Thu, 13 Dec 2012 00:00:00 +0000

So, you got an email from DVLUP stating that your challenge submission was denied. Why were you denied? What did you miss? I wanted to write this post to share the top reasons for denial and how to fix it… 90% of these are due to the fact you didn’t edit your WMAppManifest file.

Here are the top offenders:

Not all Live Tiles Sizes
No animated Tiles
Not all WP8 resolutions

#1- You need to have all three tile sizes enabled for your app. Here is a list of the tile sizes from the MSDN Documentation . To rectify this problem, simply toggle the “Support for large Tiles” property in your WMAppManifest file. See the image in answer #2 for more details.