通过ListView GroupStyle内的Converter修改Expander样式

问题描述

您好，最近我一直在困扰一个设计问题，希望您能为我提供帮助.

Hi there, I have been messing with a design problem these days and I hope you could help me.

我有一个带有GroupStyle的ListView，可以正确显示它，但是当我尝试使用转换器更改Expander样式时，我的问题来了.

I have a ListView with a GroupStyle which is correctly shown but my problem comes when I try to change the Expander style with a converter. 

• 这就是我定义GroupStyle的方式("ar"是样式的数组)

<ListView.GroupStyle>
                <GroupStyle>
                    <GroupStyle.ContainerStyle>
                        <Style TargetType="{x:Type GroupItem}">
                            <Setter Property="Template">
                                <Setter.Value>
                                    <ControlTemplate>
                                        <Expander IsExpanded="False" Style="{Binding Path=state,
                Converter={StaticResource InverseConditionalSetterConverter},
                ConverterParameter={StaticResource ar}
                }">
                                            <Expander.Header>
                                                <StackPanel Orientation="Horizontal">
                                                    <TextBlock Text="{Binding Name}" FontWeight="Bold" Foreground="Gray" FontSize="12" VerticalAlignment="Bottom" />

</StackPanel> </Expander.Header>

</StackPanel> </Expander.Header>

< ItemsPresenter/> </Expander> </ControlTemplate> </Setter.Value> </Setter> </样式> </GroupStyle.ContainerStyle> </GroupStyle> </ListView.GroupStyle>

<ItemsPresenter /> </Expander> </ControlTemplate> </Setter.Value> </Setter> </Style> </GroupStyle.ContainerStyle> </GroupStyle> </ListView.GroupStyle>

• 这是我的转换器.

public class ConditionalSetterConverter : IValueConverter
    {
        public int Inverse { get; set; }

        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            Style[] s = parameter as Style[];
            switch ((int)value)
            {
                case 1:
                    return s[0];
                case 2:
                    return s[1];
                default:
                    return null;
            }

        }

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

如果我将此转换器与普通扩展器(在组外)一起使用，则该转换器可以工作.

If I use this converter with a normal Expander (outside the group), the converter works.

推荐答案

您有对InverseConditionalSetterConverter的引用，但该转换器被命名为ConditionalSetterConverter.  您的XAML中有一个ConverterParameter，但您显示的转换器使用的值未在 XAML.

You have a reference to InverseConditionalSetterConverter yet the converter is named ConditionalSetterConverter.  You have a ConverterParameter in your XAML but the converter you show uses a value which is not set in anything that is show in the XAML.

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