Why I cannot input Japanese to TextBox?

[sakai-IST]

Details

I want to ListBox with editable TextBox. And I use this sourcecode.

The Minimum sourcecode

```

<Window.Resources>
    <Style x:Key="ListBoxItemStyle" TargetType="ListBoxItem">
        <Setter Property="HorizontalContentAlignment" Value="Stretch"/>
        <Setter Property="Height" Value="25"/>
        <Setter Property="Padding" Value="0"/>
    </Style>
</Window.Resources>

<Grid>
    <ListBox VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
             ItemContainerStyle="{StaticResource ListBoxItemStyle}"
             ItemsSource="{Binding ItemList}">

        <ItemsControl.ItemTemplate>
            <DataTemplate>
                    <DockPanel Height="24">
                        <TextBox Margin="0" VerticalContentAlignment="Center" Height="23"
                                 LostFocus="TextBox_LostFocus"
                                 MouseDoubleClick="TextBox_MouseDoubleClick"
                                 Text="{Binding Path=Name, UpdateSourceTrigger=PropertyChanged}">
                            <TextBox.Style>
                                <Style>
                                    <Style.Triggers>
                                        <DataTrigger Binding="{Binding IsEditNow}" Value="True">
                                            <Setter Property="TextBox.IsReadOnly" Value="False"/>
                                            <Setter Property="TextBox.BorderThickness" Value="1"/>
                                        </DataTrigger>

                                        <DataTrigger Binding="{Binding IsEditNow}" Value="False">
                                            <Setter Property="TextBox.IsReadOnly" Value="True"/>
                                            <Setter Property="TextBox.BorderThickness" Value="0"/>
                                        </DataTrigger>
                                    </Style.Triggers>
                                </Style>
                            </TextBox.Style>
                        </TextBox>
                    </DockPanel>
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ListBox>
</Grid>

```

using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;

namespace WpfApp2
{
    /// <summary>
    /// MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        ViewModel mViewModel = new ViewModel();
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = mViewModel;
        }

        private void TextBox_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            mViewModel.setEditStatus((sender as TextBox).Text, true);
        }

        private void TextBox_LostFocus(object sender, RoutedEventArgs e)
        {
            mViewModel.setEditStatus((sender as TextBox).Text, false);
        }
    }

    public class Item : DataBindingBase
    {
        private string _name = "";
        private bool _isEditNow = false;

        public string Name { get { return _name; } set { _name = value; NotifyPropertyChanged(nameof(Name)); } }
        public bool IsEditNow { get { return _isEditNow; } set { _isEditNow = value; NotifyPropertyChanged(nameof(IsEditNow)); } }
    }


    public class ViewModel : DataBindingBase
    {
        public ViewModel()
        {
            this.ItemList.Add(new Item() { Name = "Test1" });
            this.ItemList.Add(new Item() { Name = "Test2" });
            this.ItemList.Add(new Item() { Name = "Test3" });
            this.ItemList.Add(new Item() { Name = "Test4" });
        }

        private ObservableCollection<Item> _itemList = new ObservableCollection<Item>();
        public ObservableCollection<Item> ItemList
        {
            get
            {
                return _itemList;
            }
            set
            {
                _itemList = value;
                NotifyPropertyChanged(nameof(ItemList));
            }
        }

        public void setEditStatus(string pName, bool pIsEditNow)
        {
            if (string.IsNullOrEmpty(pName) == false)
            {
                if (this.ItemList.FirstOrDefault() != null)
                {
                    if (this.ItemList.Select(x => x.Name).Contains(pName) == true)
                    {
                        this.ItemList.FirstOrDefault(x => x.Name == pName).IsEditNow = pIsEditNow;
                    }
                }
            }
        }
    }

    public class DataBindingBase : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged;
        protected void NotifyPropertyChanged(string pPropertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(pPropertyName));
            }
        }
    }
}

I can/cannot ...

I can edit with byte character (ex. 0-9, a-z, A-Z). But I cannot edit with double-byte character (ex. Japanese 'テスト').
I tried this pattern with reference to this article.

Number	Use IME	Use previous version	Windows version	Result
1	MS IME	OFF	Windows 10 and 11	cannot edit
2	MS IME	OFF	Windows server 2022	can edit
3	MS IME	ON	Windows 10 and 11	can edit
4	MS IME	ON	Windows server 2022	can edit
5	Google IME	-	Windows 10 and 11	can edit

My sourcecode is wrong? Thank you very much.