Sadie  Ratke

Sadie Ratke

1596336473

Introducing C# Markup for Xamarin.Forms

C# Markup

Xamarin.Forms 4.6 introduced C# Markup, a set of fluent helpers and classes that aim to make UI development in C# a joy.

C# Markup helps developers write concise declarative UI markup and cleanly separate it from UI logic, all in C#. Developers get to enjoy C#’s first-class IDE support when writing markup. A single language for markup and logic reduces friction, markup scattering and cognitive load; there is less or no need for language bridging mechanisms like separate converters, styles, resource dictionaries, behaviours, triggers and markup extensions.

Example

Let’s introduce the main features of C# Markup by building this Twitter search page:

Twitter Search Example

The full source of this example can be found here.

Build Top-Down with Hot Reload

C# Markup makes it easy to write markup using a top-down approach – so it reads like a story, filling in details while you progress. This short video shows the process from start to finish in 2.5 minutes (using DebugRainbows and LiveSharp):

Note that this video is unedited and realtime; it was recorded in one go by replaying git commits from the command line.

Write the Page – Like a Story

At the highest level the page contains a header, search results and a footer. So, if we structure the markup top-down – to make it read like a story – the initial markup could be:

SearchPage.cs

using Xamarin.Forms.Markup;

public partial class SearchPage
{
    void Build() => Content = 
        new StackLayout { Children = {
            Header,
            SearchResults,
            Footer
        }};

    StackLayout Header => new StackLayout { };

    CollectionView SearchResults => new CollectionView { };

    Label Footer => new Label { };
}

The void Build() => Content = pattern is a convention that lets you use LiveSharp for stateful hot reload of C# Markup. If you don’t plan on using LiveSharp, omit the Build() method and put the Content assignment in the page constructor.

For now C# Markup is an experimental feature. So we need to set a flag to enable the feature:

App.cs

Device.SetFlags(new string[]{ "Markup_Experimental" });

#developers #xamarin.forms #c# markup #coded ui #programming-c #csharp

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Buddha Community

Introducing C# Markup for Xamarin.Forms

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In this Xamarin Online course, you will learn each and every topic with the help of hands-on labs. This program includes a hands-on live project with the implementation of recommended design patterns and practices. The learning path for this program is given below:
Xamarin Training objective
At the completion of this course, attendees will be able to;

  1. Understand Xamarin architecture
  2. Understand Xamarin .Android, Xamarin. iOS fundamentals
  3. Understand Xamarin. Forms fundamentals
  4. Build UI with XAML and code
  5. Work with images, display data beautifully and create interactive lists
  6. Implement multi-page apps with navigation, tabs, master/detail pages
  7. Store and retrieve data from a variety of sources like file system, SQLite database and RESTful services
  8. Implement MVVM pattern

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Sadie  Ratke

Sadie Ratke

1596336473

Introducing C# Markup for Xamarin.Forms

C# Markup

Xamarin.Forms 4.6 introduced C# Markup, a set of fluent helpers and classes that aim to make UI development in C# a joy.

C# Markup helps developers write concise declarative UI markup and cleanly separate it from UI logic, all in C#. Developers get to enjoy C#’s first-class IDE support when writing markup. A single language for markup and logic reduces friction, markup scattering and cognitive load; there is less or no need for language bridging mechanisms like separate converters, styles, resource dictionaries, behaviours, triggers and markup extensions.

Example

Let’s introduce the main features of C# Markup by building this Twitter search page:

Twitter Search Example

The full source of this example can be found here.

Build Top-Down with Hot Reload

C# Markup makes it easy to write markup using a top-down approach – so it reads like a story, filling in details while you progress. This short video shows the process from start to finish in 2.5 minutes (using DebugRainbows and LiveSharp):

Note that this video is unedited and realtime; it was recorded in one go by replaying git commits from the command line.

Write the Page – Like a Story

At the highest level the page contains a header, search results and a footer. So, if we structure the markup top-down – to make it read like a story – the initial markup could be:

SearchPage.cs

using Xamarin.Forms.Markup;

public partial class SearchPage
{
    void Build() => Content = 
        new StackLayout { Children = {
            Header,
            SearchResults,
            Footer
        }};

    StackLayout Header => new StackLayout { };

    CollectionView SearchResults => new CollectionView { };

    Label Footer => new Label { };
}

The void Build() => Content = pattern is a convention that lets you use LiveSharp for stateful hot reload of C# Markup. If you don’t plan on using LiveSharp, omit the Build() method and put the Content assignment in the page constructor.

For now C# Markup is an experimental feature. So we need to set a flag to enable the feature:

App.cs

Device.SetFlags(new string[]{ "Markup_Experimental" });

#developers #xamarin.forms #c# markup #coded ui #programming-c #csharp

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#xamarin
#aspdotnetexplorer
https://youtu.be/7aitQiXxG2s

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