This way of associating events fired by XAML elements and C# event handlers is the easiest and most straightforward and was already explained in the previous article in Creating and Running a Simple Avalonia Project using Visual Studio 2019. The C# code-behind usually contains definitions of methods that serve as event handlers for the events fired by elements defined in XAML file. XAML file can be associated with a C# file called "code-behind" to define the same class using "partial class" declarations. It can point to a C# namespace or a set of C# namespaces (as will be explained below with an appropriate example). The namespace (in our sample, it is " my_namespace") should usually be defined above or within the XML tag where it is used. If the property or type mentioned in XAML file do not exist, the compilation of the project that contains that XAML will fail and often Visual Studio will detect an error even before the compilation and will underscore the missing type or property with a red broken line. Note that the properties will be resolved to their C# type, e.g., if Prop2 is of int type, it will be resolved to 123 integer value, while if it is of string type, it will be resolved to " 123" string. The XAML code in the example above creates an object of type M圜lass from XML namespace my_namespace and sets its properties Prop1 to string " Hello World" and Prop2 to value 123. XAML is XML used for building C# (mostly visual) objects.Ĭ# classes are displayed as XML tags, while class properties are usually displayed as XML attributes: I also used much of the material and samples for this article for the new Avalonia documentation to be available soon at Avalonia Documentation.Īll the code for this article is located under NP.Avalonia.Demos/NP.Demos.XamlSamples within Github NP.Avalonia.Demos repository. I devote a section in this article to Generics in Avalonia XAML. Note, that I recently found out (from the following excellent demo TypeArgumentsDemo) that Avalonia extension for Visual Studio 2019 supports generics for compiled XAML - something that WPF team promised to add long ago, but to the best of my knowledge, never did. NET Framework Programming Basic Concepts in Easy Samples) or into Templates and Styles (this will be covered in future articles).Įven though all the samples here are dealing with Avalonia, much of it applies also to other XAML frameworks like WPF, UWP and Xamarin. Here, we will not go into covering how the attached properties or bindings are represented in XAML (this has already been covered in Multiplatform Avalonia. The material in this article covers the basics of Avalonia XAML like namespaces, types, properties, resources, generics and basic markup extensions for beginners. The source code for Avalonia is available at Avalonia Source Code. It is assumed that the readers of this article have some basic familiarity with XML and C#.Īvalonia is a great new open source package which closely resembles WPF but, unlike WPF or UWP, works on most platforms - Windows, MacOS and various flavors of Linux and is in many respects, is more powerful than WPF.Īvalonia is also considerably more powerful and flexible for building multiplatform desktop applications than Node.js or Xamarin. You do not need to read the previous two articles in order to understand it aside from instructions on setting up your Visual Studio and creating an Avalonia project. The article is a guide to basic XAML functionality. NET Framework Programming Basic Concepts in Easy Samples. Part 1 - AvaloniaUI Building Blocks and Multiplatform Avalonia. This article is the third instalment of Avalonia articles following Multiplatform UI Coding with AvaloniaUI in Easy Samples.
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