我可以在不知道绑定本身的情况下更改 DataTrigger 中绑定的属性吗？

我有一个TextBox如果框未聚焦，则格式化数字，但在编辑时保持数字未格式化。

这是我想要的多个数字文本框的样式，但它们都包含不同的文本绑定。常规文本设置器和触发式文本设置器之间的唯一区别是触发式文本设置器具有StringFormat=N2在绑定中。

有没有办法让这种风格变得通用，比如只改变StringFormatDataTrigger 中绑定的属性？

<TextBox>
    <TextBox.Style>
        <Style TargetType="{x:Type TextBox}">
                <Setter Property="Text" Value="{Binding SomeValue, StringFormat=N2, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />
            <Style.Triggers>
                <Trigger Property="IsKeyboardFocusWithin" Value="True">
                    <Setter Property="Text" Value="{Binding SomeValue, UpdateSourceTrigger=PropertyChanged, ValidatesOnDataErrors=True}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </TextBox.Style>
</TextBox>

有没有办法让这种风格变得通用，比如只改变 DataTrigger 中绑定的 StringFormat 属性？

Inherit Style新的 XAML 将变成这样：

 <TextBox>
    <TextBox.Style>
        <local:FlyingStyle Binding="{Binding ElementName=This, Path=SomeValue}" StringFormat="F2" />
    </TextBox.Style>
 </TextBox>

这是班级...

public class FlyingStyle : Style
{
    public FlyingStyle()
        : base(typeof(TextBox))
    { }

    string _stringFormat;
    public string StringFormat
    {
        get { return _stringFormat; }
        set
        {
            _stringFormat = value;
            CheckInitialize();
        }
    }
    Binding _binding;
    public Binding Binding
    {
        get { return _binding; }
        set
        {
            _binding = value;
            CheckInitialize();
        }
    }
    void CheckInitialize()
    {
        if (StringFormat == null || Binding == null) { return; }// need both

        Setters.Add(CreateSetter(Binding, StringFormat));

        var trigger = new Trigger
        {
            Property = UIElement.IsKeyboardFocusWithinProperty,
            Value = true,
        };
        trigger.Setters.Add(CreateSetter(Binding));
        Triggers.Add(trigger);
    }

    /// <summary>Creates the common <see cref="Setter"/>.</summary>
    static Setter CreateSetter(Binding binding, string stringFormat = null)
    {
        // must create a copy, because same binding ref but diff StringFormats
        var bindingCopy = new Binding
        {
            // these could be copies as well
            UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged,
            ValidatesOnDataErrors = true,
            Mode = BindingMode.TwoWay,
            Path = binding.Path,

            AsyncState = binding.AsyncState,
            BindingGroupName = binding.BindingGroupName,
            BindsDirectlyToSource = binding.BindsDirectlyToSource,
            Converter = binding.Converter,
            ConverterCulture = binding.ConverterCulture,
            ConverterParameter = binding.ConverterParameter,
            ElementName = binding.ElementName,
            FallbackValue = binding.FallbackValue,
            IsAsync = binding.IsAsync,
            NotifyOnSourceUpdated = binding.NotifyOnSourceUpdated,
            NotifyOnTargetUpdated = binding.NotifyOnTargetUpdated,
            NotifyOnValidationError = binding.NotifyOnValidationError,
            //StringFormat = set below...
            TargetNullValue = binding.TargetNullValue,
            UpdateSourceExceptionFilter = binding.UpdateSourceExceptionFilter,
            ValidatesOnExceptions = binding.ValidatesOnExceptions,
            XPath = binding.XPath,
            //ValidationRules = binding.ValidationRules
        };
        // mutex ElementName, so modify if needed
        // Source = binding.Source,
        // RelativeSource = binding.RelativeSource,

        if (stringFormat != null)
        {
            bindingCopy.StringFormat = stringFormat;
        }
        return new Setter(TextBox.TextProperty, bindingCopy);
    }
}

请注意，我的测试是

• 通用主窗口
• 实现 INotifyPropertyChanged
• SomeValueINPC财产
• 数据上下文=这个
• x:名称 = 这个