C# Avalonia 05 - RoutedEvents- OnlyNumbers

Avalonia最新版本，默认拦截了TextInputEvent事件，所以无法通过xaml来定义。

OnlyNumbers.axaml代码

<Window xmlns="https://github.com/avaloniaui"
        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"
        Height="300" Width="300"
        x:Class="AvaloniaUI.OnlyNumbers"
        Title="OnlyNumbers">
    <StackPanel Margin="5">
        <TextBox Margin="3" AcceptsTab="True"></TextBox>
        <TextBox Margin="3"></TextBox>
        <TextBox Margin="3"></TextBox>
    </StackPanel>
</Window>

OnlyNumbers.axaml.cs代码

using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using System;
using System.Linq;

namespace AvaloniaUI;

public partial class OnlyNumbers : Window
{
    public OnlyNumbers()
    {
        InitializeComponent();
        this.AddHandler(TextInputEvent, PreTextCheck, RoutingStrategies.Tunnel);
        this.AddHandler(KeyDownEvent, PreKeyDown, RoutingStrategies.Tunnel);
    }

    private void PreTextCheck(object? sender, TextInputEventArgs e)
    {
        if (e.Text!.All(char.IsLetter))
        {
            e.Handled = true;
        }
    }

    private void PreKeyDown(object? sender, KeyEventArgs e)
    {
        if (e.Key==Key.Space)
        {
            e.Handled = true;
        }
    }
}　

运行效果