Spellcheck in WPF RichTextBox does not provide good suggestions in Windows 11

Question

The Spellcheck in WPF's RichTextBox gives out excellent suggestions on Windows 10. See image below from "iwth" to "with".

But the same application yields a long list of largely useless items on Windows 11.

The RickTextBox has the SpellCheck.IsEnabled="True".

Within the RichTextBox there is a FlowDocument and I have its language set up as "en".

<FlowDocument Language="en">

It does not make a difference.

Answer 1

Hi Hui,

Thanks for following up with my question.

No, my code did not use Nuget, and I did not use any special ContextMenu nor Suggestions.

I can reproduce the problem with the following standard steps:

1. Create a C# WPF project using Microsoft Visual Studio Professional 2022 Version 17.7.4, and Microsoft .NET Framework Version 4.8.09037.
2. Build a project using WPF Application C# Windows template. Targeting .NET Framework 4.8
3. create a RichTextBox as showing below.
4. Compile it, when the simple app is run in Windows 10, and after I type in "iwth", the spellcheck correctly suggests "with", only. But if I run the app in Windows 11, the spellcheck spits out a long list of suggestions but not "with". The suggestion list even goes so far as to include "withs". I just cannot figure it out. Why "withs" but not "with".

Thanks.

Bing

<Window x:Class="WpfApp1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp1"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <RichTextBox Name="rtbNote" Grid.Row="0" Grid.Column="0" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" SpellCheck.IsEnabled="True" >
            <FlowDocument Language="en">
                <Paragraph>
                    <Run Text="RichTextBox"/>
                </Paragraph>
            </FlowDocument>
        </RichTextBox>
    </Grid>
</Window>

Answer 2

Hi Liu Hui,

Happy New Year.

Any update on this issue? The clients are waiting for an answer, even though it is a relatively minor glitch.

Thanks.

Bing Li