wpf绑定到索引器

Question

<TextBlock Text="{Binding Path=[0]} />

要么

<TextBlock Text="{Binding Path=[myKey]} />

工作良好.但有没有办法将变量作为索引键传递？

<TextBlock Text="{Binding Path=[{Binding Column.Index}]} />

Answer 1

处理此问题的最快方法通常是使用MultiBinding和IMultiValueConverter接受集合及其绑定的索引:

<TextBlock.Text>
    <MultiBinding Converter="{StaticResource ListIndexToValueConverter}">
        <Binding /> <!-- assuming the collection is the DataContext -->
        <Binding Path="Column.Index"/>
    </MultiBinding>
</TextBlock.Text>

然后转换器可以根据这两个值进行查找,如下所示:

public object Convert(object[] values, Type targetType, object parameter, CultureInfo culture)
{
    if (values.Length < 2)
        return Binding.DoNothing;

    IList list = values[0] as IList;
    if (list == null || values[1] == null || !(values[1] is int))
        return Binding.DoNothing;

    return list[(int)values[1]];
}

Answer 2

这需要一个.IValueConverter IMultiValueConverter