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Why is the KeyDown event of TextBox not triggered?#

Because TextBox handles the KeyDown event internally. If you need to handle the event before TextBox processes it, you should register a tunnel event:

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target.AddHandler(InputElement.KeyDownEvent, OnTextBoxKeyDown, RoutingStrategies.Tunnel);

void OnTextBoxKeyDown(object sender, KeyEventArgs e)
{
    // Write your codes here
}

💖 Provided by kongdetuo

🔗 Original Document Avalonia 常见问题

（Obtained permission from original author，Modified）