How to implement HtmlText property for WPF RichTextBox Control?
You can bind HTML text with WPF RIchTextBox (SfRichTextBoxAdv) content by implementing an extension class with the HtmlText property.
Please refer to the following code samples.
C#
/// <summary> /// Represents the extension class for SfRichTextBoxAdv. /// </summary> public class SfRichTextBoxAdvExtension : SfRichTextBoxAdv { #region Fields bool skipUpdating = false; #endregion #region Properties /// <summary> /// Gets or sets the HTML text. /// </summary> public string HtmlText { get { return (string)GetValue(HtmlTextProperty); } set { SetValue(HtmlTextProperty, value); } } #endregion #region Constructor /// <summary> /// Initializes an instance of the SfRichTextBoxAdvExtension class. /// </summary> public SfRichTextBoxAdvExtension() { // Wires the ContentChanged event. this.ContentChanged += RTE_ContentChanged; } #endregion #region Static Dependency Properties /// <summary> /// Used as a backing store for the HtmlText dependency property to enable styling, animation, etc. /// </summary> public static readonly DependencyProperty HtmlTextProperty = DependencyProperty.Register("HtmlText", typeof(string), typeof(SfRichTextBoxAdvExtension), new PropertyMetadata(string.Empty, new PropertyChangedCallback(OnHtmlTextChanged))); #endregion #region Static Events /// <summary> /// Called when the HTML text changes. /// </summary> /// <param name="obj"></param> /// <param name="e"></param> private static void OnHtmlTextChanged(DependencyObject obj, DependencyPropertyChangedEventArgs e) { SfRichTextBoxAdvExtension richTextBox = (SfRichTextBoxAdvExtension)obj; // Update the document with the HTML. richTextBox.UpdateDocument((string)e.NewValue); } #endregion #region Events /// <summary> /// Called when content changes in SfRichTextBoxAdv. /// </summary> /// <param name="obj"></param> /// <param name="args"></param> void RTE_ContentChanged(object obj, ContentChangedEventArgs args) { if (this.Document != null) { // To skip internal updating of the document when setting the HtmlText property. skipUpdating = true; Stream stream = new MemoryStream(); // Saves the document as an HTML Stream. this.Save(stream, FormatType.Html); stream.Position = 0; // Reads the stream and assigns the string to the HtmlText property. using (StreamReader reader = new StreamReader(stream)) { this.HtmlText = reader.ReadToEnd(); } skipUpdating = false; } } #endregion #region Implementation /// <summary> /// Updates the document. /// </summary> /// <param name="htmlText"></param> private void UpdateDocument(string htmlText) { // If the HtmlText property is set internally means, skip updating the document. if (!skipUpdating && !string.IsNullOrEmpty(htmlText)) { Stream stream = new MemoryStream(); // Convert the HTML string to a byte array. byte[] bytes = Encoding.UTF8.GetBytes(htmlText); // Write the byte array to the stream. stream.Write(bytes, 0, bytes.Length); stream.Position = 0; // Load the HTML stream. Load(stream, FormatType.Html); } } /// <summary> /// Disposes of the instance. /// </summary> public void Dispose() { this.ContentChanged -= RTE_ContentChanged; ClearValue(HtmlTextProperty); base.Dispose(); } #endregion }
XAML
<local:SfRichTextBoxAdvExtension x:Name="richTextBoxAdv" Grid.Row="2" HtmlText="{Binding HtmlText, Mode=TwoWay}" LayoutType="Continuous" EnableMiniToolBar="False" FontFamily="Arial" FontSize="12" DocumentTitle="Note 1"/>
Conclusion
I hope you enjoyed learning about how to implement the HtmlText property for the WPF RichTextBox Control.
You can refer to our WPF RichTextBox feature tour page to learn about its other groundbreaking feature representations. You can also explore our WPF RichTextBox documentation to understand how to create and manipulate data.
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