Last updated: October 12, 2023<\/p>\n<\/header>\n \n Universal Windows Platform (UWP) is a heterogeneous platform developed by Microsoft that provides the tools and APIs necessary for creating applications that run on various Windows 10 devices. UWP applications use a specific UI markup language called XAML (Extensible Application Markup Language) to define their UI. This article presents an in-depth explanation of UWP’s markup extensions along with example code.\n <\/p>\n<\/section>\n \n XAML is used to define all UI components such as UI elements, data binding, and styles. By using XAML, you can declaratively build a UI, and UWP inherently supports various types of UI elements and controls. The syntax of XAML is similar to HTML, but it is designed to operate within the Windows environment.\n <\/p>\n \n UWP provides a rich set of UI components by default. However, to meet specific requirements, it may be necessary to extend existing markup languages or create custom controls. Markup extensions can provide ongoing solutions for these needs and enhance UI reusability.\n <\/p>\n \n For example, you can create a custom button to implement specific styles or behaviors. This increases code reusability and improves maintainability.\n <\/p>\n<\/section>\n \n Now, let’s look at how to actually create markup extensions. Custom controls can be created by inheriting from UserControl and can be used alongside existing XAML.\n <\/p>\n \n Below is the process for creating a custom button. This button can dynamically set text and background color.\n <\/p>\n \n You can define how to use the custom button as follows.\n <\/p>\n \n When creating markup extensions, there are several important considerations. First, performance. Custom controls can sometimes lead to performance degradation, so it’s advisable to use them only when necessary. Second, accessibility. Custom controls should be developed with accessibility in mind and should be compatible with screen readers.\n <\/p>\nIntroduction<\/h2>\n
Basics of XAML<\/h2>\n
Example: Basic XAML Structure<\/h3>\n
<Page\n x:Class=\"MyApp.MainPage\"\n xmlns=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\/presentation\"\n xmlns:x=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\"\n xmlns:local=\"using:MyApp\"\n xmlns:d=\"http:\/\/schemas.microsoft.com\/expression\/blend\/2008\"\n xmlns:mc=\"http:\/\/schemas.openxmlformats.org\/markup-compatibility\/2006\"\n mc:Ignorable=\"d\">\n\n <Grid Background=\"{ThemeResource ApplicationPageBackgroundThemeBrush}\">\n <TextBlock Text=\"Hello, UWP!\" HorizontalAlignment=\"Center\" VerticalAlignment=\"Center\" FontSize=\"24\"\/>\n <\/Grid>\n\n<\/Page><\/code><\/pre>\n<\/section>\nThe Need for Markup Extensions<\/h2>\n
Creating Markup Extensions<\/h2>\n
Example: Creating a Custom Button<\/h3>\n
<UserControl\n x:Class=\"MyApp.CustomButton\"\n xmlns=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\/presentation\"\n xmlns:x=\"http:\/\/schemas.microsoft.com\/winfx\/2006\/xaml\"\n x:Name=\"customButton\">\n\n <Border Background=\"{Binding BackgroundColor, ElementName=customButton}\" CornerRadius=\"5\" Padding=\"10\">\n <TextBlock Text=\"{Binding ButtonText, ElementName=customButton}\" Foreground=\"White\" FontSize=\"16\"\/>\n <\/Border>\n\n<\/UserControl><\/code><\/pre>\nCode Behind: CustomButton.xaml.cs<\/h3>\n
using Windows.UI.Xaml.Controls;\n\nnamespace MyApp\n{\n public sealed partial class CustomButton : UserControl\n {\n public static readonly DependencyProperty ButtonTextProperty =\n DependencyProperty.Register(\"ButtonText\", typeof(string), typeof(CustomButton), null);\n \n public string ButtonText\n {\n get { return (string)GetValue(ButtonTextProperty); }\n set { SetValue(ButtonTextProperty, value); }\n }\n\n public static readonly DependencyProperty BackgroundColorProperty =\n DependencyProperty.Register(\"BackgroundColor\", typeof(Windows.UI.Color), typeof(CustomButton), null);\n \n public Windows.UI.Color BackgroundColor\n {\n get { return (Windows.UI.Color)GetValue(BackgroundColorProperty); }\n set { SetValue(BackgroundColorProperty, value); }\n }\n\n public CustomButton()\n {\n this.InitializeComponent();\n }\n }\n}<\/code><\/pre>\nUsage<\/h3>\n
<local:CustomButton ButtonText=\"Click Me\" BackgroundColor=\"Blue\" \/><\/code><\/pre>\n<\/section>\nConsiderations When Creating Markup Extensions<\/h2>\n