WPF 绑定不通知更改

发布于 2024-07-22 16:02:34 字数 1103 浏览 6 评论 0原文

我有 WPF 排序/绑定问题。（免责声明：我对 WPF 和数据绑定非常陌生，所以如果我问了一个非常愚蠢的问题，请道歉:-)）

首先，我有一个带有 EntitySet的 linqToSql 实体类 Contact 。 属性预订就可以了。

如果我直接将此 Bookings 属性绑定到 ListView，应用程序似乎会正确通知 ListView 中所选项目的更改，这样带有 { 的文本框Binding Path=Bookings/Comments} 正确更新。

// This code works, but Bookings is unsorted  
var binding = new Binding();
binding.Source = contact.Bookings;
bookings.SetBinding(ItemsControl.ItemsSourceProperty, binding);

但是，因为我似乎无法找到对 EntitySet 进行排序的方法（请参阅这篇文章），我试图绑定到一个可观察集合，例如：

// This code doesn't notify of selected item changes in the ListView
var binding = new Binding();
binding.Source = new ObservableCollection<Booking>(contact.Bookings.OrderByDescending(b => b.TravelDate).ToList());
bookings.SetBinding(ItemsControl.ItemsSourceProperty, binding);

但这似乎没有正确通知评论文本框以使其更新。

如果有人有一个在绑定之前或之后对数据进行排序的解决方案，或者另一个可行的解决方案，我们将不胜感激。

原文

I have a WPF sorting/binding issue. (Disclaimer: I am very new to WPF and databinding so apologise if I am asking a really dumb question :-))

Firstly, I have a linqToSql entity class Contact with an EntitySet<Booking> property Bookings on it.

If I directly bind this Bookings property to a ListView, the application seems to correctly notify of changes to the selected item in the ListView, such that a textbox with {Binding Path=Bookings/Comments} updates correctly.

// This code works, but Bookings is unsorted  
var binding = new Binding();
binding.Source = contact.Bookings;
bookings.SetBinding(ItemsControl.ItemsSourceProperty, binding);

However, as I can't seem to be able to find a way to sort an EntitySet (see this post), I am trying to bind instead to an Observable collection, e.g:

// This code doesn't notify of selected item changes in the ListView
var binding = new Binding();
binding.Source = new ObservableCollection<Booking>(contact.Bookings.OrderByDescending(b => b.TravelDate).ToList());
bookings.SetBinding(ItemsControl.ItemsSourceProperty, binding);

But this doesn't seem to notify the comments textbox correctly such that it updates.

If anyone has a solution for either sorting the data before or after its bound, or another solution that will work that would be much appreciated.

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め七分饶幸 2024-07-29 16:02:34

您应该绑定到 CollectionView 而不是集合本身。这将允许您指定您需要的任何排序标准。例子：

var collectionView = new ListCollectionView(contact.Bookings);
collectionView.SortDescriptions.Add(new SortDescription("TravelDate", ListSortDirection.Ascending));
var binding = new Binding();
binding.Source = collectionView;
bookings.SetBinding(ItemsControl.ItemsSourceProperty, binding);

You should bind to a CollectionView rather than the collection itself. That will allow you to specify whatever sorting criteria you require. Example:

var collectionView = new ListCollectionView(contact.Bookings);
collectionView.SortDescriptions.Add(new SortDescription("TravelDate", ListSortDirection.Ascending));
var binding = new Binding();
binding.Source = collectionView;
bookings.SetBinding(ItemsControl.ItemsSourceProperty, binding);

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