TextSpan Class

A span of document content.

Namespace: DevExpress.Blazor.RichEdit

Assembly: DevExpress.Blazor.RichEdit.v21.2.dll


public class TextSpan :


A TextSpan object contains the following information:

  • The textual representation of the span content (Text).
  • The span interval in the sub-document (Interval).
  • Style and formatting settings of characters in the span (for instance, FontSize, Underline).

Use an instance of the TextSpan class to change character properties in the document. Pass a CharacterProperties object to the ChangePropertiesAsync(Action<CharacterProperties>) method to change properties of the text span’s characters. You can specify character properties manually or use the CopyFrom(TextSpan) method to copy properties from another text span.

Call a GetTextSpanAsync method to get a span contained in the specified sub-document interval.

The code sample below applies bold formatting to characters in the selected intervals.

<DxRichEdit @ref="richEdit" @bind-Selection="@selection" />
@code {
    DxRichEdit richEdit { get; set; }
    Selection selection { get; set; }
    @* ... *@
        /* Surround the code that contains an asynchronous operation with a try-catch block to handle
        the OperationCanceledException. This exception is thrown when an asynchronous operation is cancelled. */
        try {
            IReadOnlyList<Interval> intervals = richEdit.Selection.Intervals;
            foreach (Interval interval in intervals) {
                TextSpan boldTextSpan = await richEdit.DocumentAPI.GetTextSpanAsync(interval);
                await boldTextSpan.ChangePropertiesAsync(properties => {
                    properties.FontBold = true;
        catch (OperationCanceledException e) {
            Console.WriteLine($"{nameof(OperationCanceledException)} thrown with message: {e.Message}");

Run Demo: RichEdit – Document API


See Also