在 WP7 上以 XAML 格式格式化日期 [英] Formatting a date in XAML on WP7

问题描述

有没有办法在 Windows Phone 7 中使用 XAML 格式化日期?

Is there a way to format a date using XAML for Windows Phone 7?

如果尝试使用:

<TextBlock Text="{Binding Date, StringFormat={}{0:MM/dd/yyyy}}" />

但我收到错误:

在绑定"类型中找不到属性StringFormat"

The property 'StringFormat' was not found in type 'Binding'

推荐答案

在 SL4 中这是可能的...

Within SL4 this is possible...

<TextBlock Text="{Binding Date, StringFormat='MM/dd/yyyy'}}"/>

...在 SL3 中，您需要使用 IValueConverter.

...within SL3 you would need to make use of an IValueConverter.

public class DateTimeToStringConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        return String.Format("{0:MM/dd/yyyy}", (DateTime)value);
    }

    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
    {
        throw new NotImplementedException();
    }
}

如果您想要更强大的方法，您可以使用 ConverterParameter.

If you wanted a more robust approach you could make use of the ConverterParameter.

    public class DateTimeToStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
                if (parameter == null)
                    return ((DateTime)value).ToString(culture);
                else
                    return ((DateTime)value).ToString(parameter as string, culture);
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            throw new NotImplementedException();
        }
    }

然后在您的 XAML 中，您首先将转换器定义为资源...

Then in your XAML you would first define the converter as a resource...

<namespace:DateTimeToStringConverter x:Key="MyDateTimeToStringConverter"/>

...然后将其与可接受的参数一起引用以格式化 DateTime 值...

..then reference it along with an acceptable parameter for formatting the DateTime value...

<TextBlock Text="{Binding Date, 
         Converter={StaticResource MyDateTimeToStringConverter}, 
         ConverterParameter=\{0:M\}}"/>

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