回答編集履歴
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見直しキャンペーン中
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`BackSpace`を送るといいながら`Key.Back`がどこにもなくないですか？（まあリンク先が不親切なんですが^^;
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`BackSpace`を送るといいながら、`Key.Back`がどこにもなくないですか？（まあリンク先が不親切なんですが^^;
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このあたりは詳しくありませんが、`Key.Back`を送れば何となく動いてる気はします。
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```
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```cs
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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namespace Questions306813
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{
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public partial class MainWindow : Window
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{
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private readonly int MaxLine = 6;
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public MainWindow() => InitializeComponent();
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private void TextBoxKeyDown(object sender, KeyEventArgs e)
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{
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if (TextBox.LineCount == MaxLine)
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{
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if (e.Key == Key.Enter) e.Handled = true;
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}
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else if (TextBox.LineCount > MaxLine)
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{
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Send(Key.Back);
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}
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}
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private void Send(Key key)
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{
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if (Keyboard.PrimaryDevice != null)
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{
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if (Keyboard.PrimaryDevice.ActiveSource != null)
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{
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var e1 = new KeyEventArgs(Keyboard.PrimaryDevice, Keyboard.PrimaryDevice.ActiveSource, 0, key)
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{
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RoutedEvent = KeyDownEvent,
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};
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InputManager.Current.ProcessInput(e1);
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}
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}
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}
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}
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}
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```
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