如何在 TargetNullValue 属性中绑定本地化字符串? [英] How to bind a Localized string in the TargetNullValue attribute?

问题描述

我有一个 Textblock，其中 Text 属性绑定到 DateTime?输入数据，我想在DateTime时显示一些东西?数据为空.
下面的代码效果很好.

I have a Textblock which Text attribute is binding to a DateTime? type data, and I want to show something when the DateTime? data is null.
The code below works great.

  < TextBlock Text="{Binding DueDate, TargetNullValue='wow,It's null'}"/>

但是如果我想将 Localizedstring 绑定到 TargetNullValue 呢?
下面的代码不起作用:(
如何?

But what about if I want to bind a Localizedstring to the TargetNullValue?
The Code below not work :(
How to?

  < TextBlock Text="{Binding DueDate, TargetNullValue={Binding LocalStrings.bt_help_Title1, Source={StaticResource LocalizedResources}} }"/>

推荐答案

我认为 TargetNullValue 没有任何方法可以做到这一点.作为解决方法，您可以尝试使用转换器:

I don't see any way to do that with TargetNullValue. As a workaround, you can try using a converter:

public class NullValueConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value != null)
        {
            return value;
        }

        var resourceName = (string)parameter;

        return AppResources.ResourceManager.GetString(resourceName);
    }

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

然后将其添加到您页面的资源中:

Then add it to the resources of your page:

<phone:PhoneApplicationPage.Resources>
    <local:NullValueConverter x:Key="NullValueConverter" />
</phone:PhoneApplicationPage.Resources>

最后，用它代替 TargetNullValue:

Finally, use it instead of TargetNullValue:

<TextBlock Text="{Binding DueDate, Converter={StaticResource NullValueConverter}, ConverterParameter=bt_help_Title1}" />

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