如何在进入单元格时选择文本

Question

我有Grid，当我走过它的细胞时，我进入细胞，但没有选择文字。这很烦人，因为当我需要更改一个值时，我首先需要使用Backspace键。

进入单元格后，如何选择该单元格的内容？

Answer 1

我建议为此目的使用行为。下面我提供了一个最小的实现，它提供了我正在寻找的思考的功能：

/// <summary>
/// <see cref="Behavior{T}"/> of <see cref="TextBox"/> for selecting all text when the text box is focused
/// </summary>
public class TextBoxSelectOnFocusBehavior : Behavior<TextBox>
{
    private void AssociatedObject_GotFocus(object sender, RoutedEventArgs e)
    {
        TextBox textBox = (sender as TextBox);

        if (textBox != null)
            textBox.SelectAll();
    }

    /// <summary>
    /// React to the behavior being attached to an object
    /// </summary>
    protected override void OnAttached()
    {
        base.OnAttached();

        AssociatedObject.GotFocus += AssociatedObject_GotFocus;
    }

    /// <summary>
    /// React to the behavior being detached from an object
    /// </summary>
    protected override void OnDetaching()
    {
        base.OnDetaching();

        AssociatedObject.GotFocus -= AssociatedObject_GotFocus;
    }
}

希望这有帮助。