C# 如何在xaml中写入ParentListBox.SelectedIndex？

我有一个列表框，其中有组合框作为列表项。每个ListItem中的组合框都是使用ListBox的ItemTemplate创建的

现在，假设我有5个列表项。i、 五个组合框

For the 1st ListItem i.e. 1st ComboBox I would like to have all the Items from database as ItemsSource. 
For the 2nd ListItem i.e. 1st ComboBox I would like to have all the Items from database as ItemsSource.
For the 3rd ListItem i.e. 1st ComboBox I would like to have only the selected Items from above Comboboxes as ItemsSource.
For the 4th ListItem i.e. 1st ComboBox I would like to have only the selected Items from above Comboboxes as ItemsSource.
For the 5th ListItem i.e. 1st ComboBox I would like to have only the selected Items from above Comboboxes as ItemsSource.

所以，我想我必须为不同的组合框使用不同的数据源

For the 1st ListItem i.e. 1st ComboBox I would like to have all the Items from database as ItemsSource. 
For the 2nd ListItem i.e. 1st ComboBox I would like to have all the Items from database as ItemsSource.
For the 3rd ListItem i.e. 1st ComboBox I would like to have only the selected Items from above Comboboxes as ItemsSource.
For the 4th ListItem i.e. 1st ComboBox I would like to have only the selected Items from above Comboboxes as ItemsSource.
For the 5th ListItem i.e. 1st ComboBox I would like to have only the selected Items from above Comboboxes as ItemsSource.

为此，我有以下开始代码：

<ComboBox....>
    <ComboBox.Style>
        <Style>
            <Style.Triggers>
                <DataTrigger Binding="ParentListBox.SelectedIndex" Value="0">
                    <Setter Property="DataSource" Value="{Binding Path=ListCorrespondingToValue1}"/>
                </DataTrigger>
                <DataTrigger Binding="ParentListBox.SelectedIndex" Value="Non-0">
                    <Setter Property="DataSource" Value="{Binding Path=ListCorrespondingToValue2}"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    <ComboBox.Style>
</ComboBox>

---

现在，我的问题是我应该如何使用父列表框的insead。在上面的代码中选择dex，我应该用什么替换Non-0？

对于非零部分，不使用

数据触发器

。。。您只需在

样式中将其设置为
Setter
，使其成为默认值，然后
DataTrigger
仅在值为
0
时更改
数据源
属性。试试这个：

<ComboBox....>
    <ComboBox.Style>
        <Style>
            <Setter Property="DataSource" Value="{Binding 
                Path=ListCorrespondingToValue2}"/>
            <Style.Triggers>
                <DataTrigger Binding="ParentListBox.SelectedIndex" Value="0">
                    <Setter Property="DataSource" Value="{Binding 
                        Path=ListCorrespondingToValue1}"/>
                </DataTrigger>
            </Style.Triggers>
        </Style>
    <ComboBox.Style>
</ComboBox>


我不知道你是否能从这里到达那里。为什么不将第一个框中的选定项绑定到ViewModel中的属性，并在选定项的属性的setter中使用适当的itemsource加载下一个框？这不是一个真正的技巧。。。它只是以
样式.Setter
设置了一个属性，但我很高兴它有帮助。