Câu hỏi phỏng vấn Xamarin
Câu hỏi

How to display static HTML string in Xamarin.Forms?

Câu trả lời

To display a static HTML string in Xamarin.Forms, you can use the WebView control along with the HtmlWebViewSource class. Here is a step-by-step guide on how to achieve this:

  1. Create a WebView in your XAML file:

    xml Copy
    <ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
                 xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
                 x:Class="YourNamespace.YourPage">
        <StackLayout>
            <WebView x:Name="webView" HeightRequest="100" WidthRequest="200"/>
        </StackLayout>
    </ContentPage>
  2. Set the HTML content in the code-behind file:

    csharp Copy
    using Xamarin.Forms;
    
    namespace YourNamespace
    {
        public partial class YourPage : ContentPage
        {
            public YourPage()
            {
                InitializeComponent();
    
                var htmlSource = new HtmlWebViewSource
                {
                    Html = @"<html><body>
                             <h1>Xamarin.Forms</h1>
                             <p>Welcome to WebView.</p>
                             </body></html>"
                };
    
                webView.Source = htmlSource;
            }
        }
    }

This example demonstrates how to create a WebView and set its source to an HTML string using the HtmlWebViewSource class. The HTML content is directly embedded within the C# code, making it a static HTML string.

Additional Notes:

  • BaseUrl Property: If your HTML content references local resources (like images or CSS files), you need to set the BaseUrl property to the appropriate path. This is particularly important for Android, iOS, and UWP platforms, as their file systems differ.

  • Binding HTML Content: If you need to bind the HTML content dynamically, you can use data binding in your ViewModel. Here is an example:

    csharp Copy
    public class YourViewModel : INotifyPropertyChanged
    {
        private HtmlWebViewSource _htmlWebViewSource;
        public HtmlWebViewSource HtmlWebViewSource
        {
            get { return _htmlWebViewSource; }
            set
            {
                _htmlWebViewSource = value;
                OnPropertyChanged();
            }
        }
    
        public YourViewModel()
        {
            HtmlWebViewSource = new HtmlWebViewSource
            {
                Html = @"<html><body>
                         <h1>Xamarin.Forms</h1>
                         <p>Welcome to WebView.</p>
                         </body></html>"
            };
        }
    
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChang...
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