2

有什么办法可以让我在文本块上只显示绑定字符串的第一个字符..?

例如;如果我绑定“男性”,我的文本块应该只显示“M”.....

4

1 回答 1

14

您可以使用值转换器返回字符串前缀:

class PrefixValueConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        string s = value.ToString();
        int prefixLength;
        if (!int.TryParse(parameter.ToString(), out prefixLength) ||
            s.Length <= prefixLength)
        {
            return s;
        }
        return s.Substring(0, prefixLength);
    }

    public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
    {
        throw new NotSupportedException();
    }
}

在 XAML 中:

<Window.Resources>
    ...
    <local:PrefixValueConverter x:Key="PrefixValueConverter"/>
</Window.Resources>
...
...{Binding Path=TheProperty, Converter={StaticResource PrefixValueConverter},
                              ConverterParameter=1}...
于 2010-01-05T13:09:55.300 回答