是否可以有一个条件设置器，大于 0 值？

发布于 2024-10-14 10:31:22 字数 325 浏览 2 评论 0原文

如何将setter分配给条件值，例如大于0？如果值不为 0，我需要隐藏一个对象。最好的方法是什么？任何想法都受到高度赞赏。

DataTrigger 的 XAML 示例：

<DataTrigger Binding="{Binding Role.Count}" Value="0">
    <Setter TargetName="Counts" Property="Visibility" Value="Hidden" />
</DataTrigger>

原文

How to assign a setter to a conditional value such as more than 0? I need to hide an object if the value will be not 0. What would be the best way to do it? Any ideas are highly appreciated.

XAML example of DataTrigger:

<DataTrigger Binding="{Binding Role.Count}" Value="0">
    <Setter TargetName="Counts" Property="Visibility" Value="Hidden" />
</DataTrigger>

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终难遇 2024-10-21 10:31:22

编写一个值转换器，例如 IsGreaterThanZero，然后将您的 XAML 编写为，

<Window.Resources>
         <local:IsGreaterThanZero x:Key="isGreaterThanZero"/>
</Window.Resources>

<DataTrigger Binding="{Binding Role.Count, Converter={StaticResource isGreaterThanZero}" Value="True">
    <Setter TargetName="Counts" Property="Visibility" Value="Hidden" />
</DataTrigger>

IsGreaterThanZero 可以编写为，

public class IsGreaterThanZero: IValueConverter
{ 
        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return Int32.Parse(value as string) > 0;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException() ;//"PresenterConverter.ConvertBack() is not implemented!");
        }
        #endregion
}

Write a value converter, say IsGreaterThanZero, then write your XAML as,

<Window.Resources>
         <local:IsGreaterThanZero x:Key="isGreaterThanZero"/>
</Window.Resources>

<DataTrigger Binding="{Binding Role.Count, Converter={StaticResource isGreaterThanZero}" Value="True">
    <Setter TargetName="Counts" Property="Visibility" Value="Hidden" />
</DataTrigger>

And IsGreaterThanZero can be written as,

public class IsGreaterThanZero: IValueConverter
{ 
        #region IValueConverter Members
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            return Int32.Parse(value as string) > 0;
        }

        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            throw new NotImplementedException() ;//"PresenterConverter.ConvertBack() is not implemented!");
        }
        #endregion
}

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