xaml - 访问 ListView 中不是来自 ItemsSource 的属性

Question

我ListView的一定要MyTexts列出来。尽管如此，我需要绑定TextCell's Text到不是来自Texts( StandAloneProperty) 的属性。我怎样才能做到这一点？

<ListView
            SelectedItem="{Binding SelectedText, Mode=TwoWay}"
            ItemsSource="{Binding MyTexts}">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <TextCell
                        Text="{Binding StandAloneProperty, StringFormat='Value: {0}'}"
                        TextColor="{Binding Color}"
                    />                    
                </DataTemplate>
            </ListView.ItemTemplate>
</ListView>

标签： xamlxamarinxamarin.formsdata-binding

Answer 1

将您的绑定设置为当前页面，并从您的 ViewModel BindingContextSource访问。StandAloneProperty

<ContentPage x:Name="pageRef"
...

<ListView
            SelectedItem="{Binding SelectedText, Mode=TwoWay}"
            ItemsSource="{Binding MyTexts}">
            <ListView.ItemTemplate>
                <DataTemplate>
                    <TextCell
                        Text="{Binding Source={x:Reference pageRef} Path=BindingContext.StandAloneProperty, StringFormat='Value: {0}'}"
                        TextColor="{Binding Color}"
                    />                    
                </DataTemplate>
            </ListView.ItemTemplate>
</ListView>