我的意思是,我有一个 listBox,我将 itemsSource 属性放入列表中.我还想在它的绑定中显示索引.
I mean, I've got a listBox, and I'm putting in itemsSource property the list. And I want to show also the index in the binding of it.
我不知道这在 WPF 中是否可行.谢谢.
I have no idea if this is possible in WPF. Thanks.
有一些方法可以做到这一点,包括 使用 AlternationIndex 的一些变通方法.
There are a few methods for doing this including some workarounds using the AlternationIndex.
但是,由于我已将 AlternationIndex 用于其他目的,因此我希望通过以下方式获得元素索引的绑定:
However, since I've used the AlternationIndex for other purposes I like to get a binding for the element index with the following:
<MultiBinding Converter="{StaticResource indexOfConverter}">
<Binding RelativeSource="{RelativeSource FindAncestor, AncestorType={x:Type ItemsControl}}" />
<Binding Path="."/>
</MultiBinding>
转换器定义为:
public class IndexOfConverter : IMultiValueConverter
{
public object Convert(object[] values, Type targetType, object parameter, System.Globalization.CultureInfo culture)
{
if (Designer.IsInDesignMode) return false;
var itemsControl = values[0] as ItemsControl;
var item = values[1];
var itemContainer = itemsControl.ItemContainerGenerator.ContainerFromItem(item);
// It may not yet be in the collection...
if (itemContainer == null)
{
return Binding.DoNothing;
}
var itemIndex = itemsControl.ItemContainerGenerator.IndexFromContainer(itemContainer);
return itemIndex;
}
public object[] ConvertBack(object value, Type[] targetTypes, object parameter, System.Globalization.CultureInfo culture)
{
return targetTypes.Select(t => Binding.DoNothing).ToArray();
}
}
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