Question

I have a Windows Phone 7 App with Listbox. I have created my own template selector class, that select proper datatemplate based on number of items in binded object. It works fine. But what I need, and what doesnt work fine, is when i change number of items in binded object, to reload template selector and update templates based on actual number. For example: ListItems with property x > 9 have color red, when x =< 9, color is green. When i change this number with onpage button from 8 to 9 I need to change the color. And It doesnt work. Looks like template selector is called only on navigateTo event... Help:)

Answer 1

关于你试图做什么,我建议使用

然而,你需要确保反映数字价值的财产也能够观察到。 (e) 请打电话<代码>。 OnPropertyChanged from it s setter.

但是,像这样的价值转换者应当做到:

public class IntToColorValueConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
    {
        if (value is int)
        {
            int number = (int)value;
            if (number < 9)
                return Colors.Green;
            else if (number > 9)
                return Colors.Red;
        }

        return value;
    }

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

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