wpf 绑定到索引器

发布于 2024-10-08 23:14:04 字数 280 浏览 5 评论 0原文

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

或者

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

工作正常。但是有没有办法将变量作为索引器键传递？

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

原文

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

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

works fine. But is there a way to pass a variable as indexer key?

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

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空袭的梦i 2024-10-15 23:14:04

处理此问题的最快方法通常是使用带有 IMultiValueConverter 的 MultiBinding，该 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]];
}

The quickest way to handle this is usually to use a MultiBinding with an IMultiValueConverter that accepts the collection and the index for its bindings:

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

The converter can then do the lookup based on the two values like this:

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]];
}

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