双倍小数分隔符 WPF

Question

在 WPF 中使用 TextBox 我会遇到问题，如果我使用 ',' 而不是 '.'每次我尝试获取值时，TextBox 内的文本都会转换为相同的数字，不带逗号..

如何禁用此自动转换？

<TextBox 
    x:Name="XValue" 
    Text="{Binding XInitValue, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}" 
    Width="80" VerticalAlignment="Center" 
    TextChanged="XValue_TextChanged" 
</TextBox>

private void XValue_TextChanged(object sender, TextChangedEventArgs e)
{
    double a = XInitValue;
}

Answer 1

我用转换器解决了这个问题

public class DecimalConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if(CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator == ".")
                return value.ToString().Replace(",", ".");
            else
                return value.ToString().Replace(".", ",");
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (CultureInfo.CurrentCulture.NumberFormat.NumberDecimalSeparator == ".")
                return value.ToString().Replace(".", ",");
            else
                return value.ToString().Replace(",", ".");
        }

    }

Answer 2

真的好用！谢谢！

我已将其更改为更通用，不要在转换器本身中使用 CurrentCulture，如果输入的值以小数分隔符结尾，则会返回错误。如果没有最后一部分，如果 UpdateSourceTrigger=PropertyChanged，我根本无法输入小数点分隔符。

public class DecimalConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value == null)
        {
            return null;
        }
        if (value is string stringValue && targetType == typeof(decimal))
        {
            var decSeparator = culture.NumberFormat.NumberDecimalSeparator;
            var normString = decSeparator == "."
                ? stringValue.Replace(",", ".")
                : stringValue.Replace(".", ",");
            if (!normString.EndsWith(decSeparator) && decimal.TryParse(normString, out var decResult))
            {
                return decResult;
            }
        }
        return DependencyProperty.UnsetValue;
    }
}

当然，CurrentCulture 应该在 App.xml.cs 或其他地方在启动应用程序时设置：

    var culture = CultureInfo.GetCultureInfo("de-DE");
    Thread.CurrentThread.CurrentCulture = culture;
    Thread.CurrentThread.CurrentUICulture = culture;
    FrameworkElement.LanguageProperty.OverrideMetadata(
        typeof(FrameworkElement),
        new FrameworkPropertyMetadata(
            XmlLanguage.GetLanguage(culture.IetfLanguageTag)));