Xml serialization is really common. For a class this is done automatically, but not for your own struct. The primitive structs from Microsoft (bool, byte, short, int, long, double, decimal, etc.) don’t have this problem. The serialization and deserialization of those types are done by the XmlSerializer class. For your own struct you have to implement the IXmlSerializable interface. This isn’t really hard, but it is harder when the struct is a readonly struct. A feature which Microsoft added to C# 7.2 a few years ago. The problem is caused by the ReadXml() method of this interface. This method returns a void which means that you have to modify the fields inside the struct, which is not allowed if the struct is readonly. Luckily there is a solution using the Unsafe.AsRef() method. In this blog I will explain how to use it.
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Accelerator keys (or keyboard accelerators) are keyboard shortcuts that improve the usability and accessibility of your Windows applications by providing an intuitive way for users to invoke common actions or commands without navigating the app UI. You can add them to a Button using the KeyboardAccelerators property. See the example below.
In the XAML of WinUI3 apps you can use the inline syntax for creating Rows and Columns inside a Grid. This is a feature which Avalonia had for a long time. It is more compact and works fine as long as you don't need a Max or Min Width/Height.
The following screenshot shows you a Grid with 2 Rows and Columns. Both in equal size. Using 4 Rectangle elements I created the Microsoft logo inside this Grid.
The following screenshot shows you the same Grid but now with inline RowDefinitions and ColumnDefinitions. It saves you a few lines of XAML.
You can customize the appearance of your apps in many ways by using the XAML framework. Styles let you set control properties and reuse those settings for a consistent appearance across multiple controls.
With Lightweight styling you override the system brushes, and the color override will affect all controls that reference that brush. Although this is called styling you are not defining a style. You just create a ResourceDictionary with a ThemeDictionary in which you override the system brushes.
If you write business apps, there are a lot of controls for data input: TextBox, CheckBox, ComboBox, DatePicker, ToggleSwitch, TimePicker, RadioButton, Slider, etc. I always wondered why there was no NumberBox. Numeric input is very common so it needs its own control for it. Luckily there is the Windows UI Library (WinUI), an open source project from Microsoft. I proposed the NumberBox last year and the team did a great job implementing it. It is released in version 2.3 and most of the issues are now solved. Time for a blog post showing of its features.
This animated GIF demonstrates a few of the features like AcceptsExpression, PlaceholderText, SpinButtons and NumberFormatter. I 'stole' it from this tweet.
C# boxing with String concatenation and interpolation
Boxing is evil and you should always try to avoid it. That is what I tell my students in my C# training. But what is boxing and how do you avoid it. Boxing is wrapping a value type (struct) inside a reference type (object or interface) variable.
Many years ago Scott Hanselman wrote the famous Scott Hanselman Ultimate Tools List post. Now it is time to write my own list because there are new tools. I'm an App developer more than a Web developer so I use different tools. I write mainly XAML (UWP and WPF) apps and only occasionally an ASP.NET website. My code is written in C#. I create them because it is fun to do and it helps me to train my own skills. I use this experience for my trainings (C#, XAML, ASP.NET and SQL). I write my own training material so I need the experience. I have about 40 Windows apps in the Store, some are very popular. The apps have almost 5 million downloads and daily thousands of players. Most of my apps are free but there are Ads in it to generate some revenue.
With Visual Studio 2019 Preview (currently version 16.2.0 Preview 3.0) you can use C# 8.0 in .NET Core 3.0 projects. You only have to set the Language version to C# 8.0 (beta) in the Advanced Build Settings. Make sure you do this for 'All configurations' and 'Any CPU', see screenshot below.
This setting will add a LangVersion property to your .csproj file (line 6).
The possibility to create your own Markup Extensions where added to UWP in the Windows Falls Creators Update SDK (16299, 1709). I only used it once. I created an OnDevice Markup Extensions which I added to the Windows Community Toolkit.
Last month Pedro Lamas wrote the blog post Making the case for XAML Markup Extensions. He demonstrates a FontIconExtension which he uses to shorten the XAML of an AppBarButton. I love his solution. His blog post inspired me to write some new Markup Extensions with the same goal, short XAML.
I'm in the process of learning the new Windows 10 SDK Preview Build 18323. It includes a new control named TwoPaneView. The TwoPaneView is a Panel control which contains two Panes. The Panes are shown next to each other if there is enough room, otherwise below each other. If that is not possible only one pane is shown. You can use it in situations in which you normally used a RelativePanel in combination with some ViewStates to reposition one panel beside or below another depending off the size (AdaptiveTriggers). This was always a lot of work which is now very easy with the new control.
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