C＃ - WPF在XAML中反向绑定ObservableCollection [英] C# - WPF Reverse binded ObservableCollection in XAML

问题描述

我有一个ObservableCollection作为ItemSource绑定到我的ComboBox。它是一个ComboBox，它显示您所做的更改。我的问题现在，最新的更改显示在列表的底部。
我试图在属性中反转，但是当我返回 ComboboxName.Reverse（）我得到一个 IEnumerable 回来。我也不想使用反转的数据做第二个集合。

I have a ObservableCollection which is binded as ItemSource to my ComboBox. It's a ComboBox which shows you your changes which you've done. My Problem is now, that the newest Change is displayed on the bottom of the list. I tried to reverse it in the property, but when I return ComboboxName.Reverse() I get an IEnumerable back. I also don't want to make a 2nd collection with the reversed data.

另一种方法是在XAML中解决这个问题。有人知道我该怎么做？

An other way would be to solve this in XAML. Does someone have an idea how I can do that?

我在这里找到了这个答案，但我不知道如何实现它。
ObservableCollection的反向顺序

I found this answer here, but i dont get it how i can implement it. Reverse order of ObservableCollection

推荐答案

scm代表

xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"

有一个适用于我的解决方案。您必须适应您的情况：

There a solution that works for me. You have to adapt it to your case:

<Window.Resources>
<CollectionViewSource x:Key="customerGroups" Source="{Binding Path=Customers}">
        <CollectionViewSource.GroupDescriptions>
            <PropertyGroupDescription PropertyName="IsCompany"></PropertyGroupDescription>
        </CollectionViewSource.GroupDescriptions>
        <CollectionViewSource.SortDescriptions>
            <scm:SortDescription PropertyName="IsCompany" Direction="Descending"/>
            <scm:SortDescription PropertyName="DisplayName" Direction="Ascending"/>
        </CollectionViewSource.SortDescriptions>
    </CollectionViewSource>
</Window.Resources>

然后，您将此资源引用为ComboBox的ItemsSource，并将内容绑定到所需的属性：

Then you reference this resource as ItemsSource of your ComboBox, and bind the content to the property you need:

 <ComboBox ItemsSource="{Binding Source={StaticResource customerGroups}}">
        <DataTemplate>
            <TextBlock Text="{Binding Path= FirstName}"></TextBlock>
        </DataTemplate>
    </ComboBox>

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