使用继承在TextBox上进行双向SelectedText绑定 [英] Two-way SelectedText binding on TextBox using inheritance

问题描述

我试图通过绑定自定义属性"Selected"将TextBox的SelectedText替换为新值.当前，通过绑定更新Selected不会更改实际的SelectedText.我想我快到了;至少鼠标选择文本正在更新选定".

I'm trying to replace the SelectedText of a TextBox with a new value by binding on the custom property 'Selected'. Currently, updating Selected through binding doesn't change the actual SelectedText. I'm almost there I think; at least mouse-selecting text is updating Selected.

如果可能的话，我希望基于从TextBox继承的解决方案.有人可以告诉我缺少什么吗?

I'd prefer solutions based on inheriting from TextBox if possible. Can anybody tell me what's missing please?

class SelectionTextbox : TextBox
{
    public static readonly DependencyProperty SelectionProperty = DependencyProperty.Register("Selection", typeof(string), typeof(SelectionTextbox));

    public string Selection
    {
        get
        {
            return (string)base.GetValue(SelectionProperty);
        }
        set
        {
            base.SetValue(SelectionProperty, value);
        }
    }
    protected override void OnSelectionChanged(RoutedEventArgs e)
    {
        base.OnSelectionChanged(e);
        Selection = SelectedText;
    }
}

推荐答案

问题是，您永远不会对分配给选择的值进行任何操作.您实际上需要将其设置为选定的文本.

The problem is, that you never actually do anything with the value you assign to Selection. You need to actually make it the selected text.

public string Selection
{
    get
    {
        return (string)base.GetValue(SelectionProperty);
    }
    set
    {
        base.SetValue(SelectionProperty, value);
        if(value != SelectedText)
            SelectedText = value;
    }
}

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