C# 您如何按一个属性对 CollectionViewSource 进行排序，然后再按另一个属性排序作为决胜局？
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How do you sort a CollectionViewSource by one property, then by another as a tiebreak?
提问by Khelvaster
Currently, my CollectionViewSource sorts a collection of items by description. If the description is the same, I want to sort based on ID. How can I specify to sort by description first, then by ID?
目前，我的 CollectionViewSource 按描述对项目集合进行排序。如果描述相同，我想根据 ID 进行排序。如何指定先按描述排序，然后按 ID 排序？
I've tried adding a second SortDescription with PropertyName="Id", but that hasn't worked.
我试过用 PropertyName="Id" 添加第二个 SortDescription，但这没有用。
<CollectionViewSource x:Key="Items" Source="{Binding Items}" >
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Description"/>
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
EDIT:The ID property was private on the viewmodel. No errors thrown.
编辑：ID 属性在视图模型上是私有的。没有抛出错误。
采纳答案by sa_ddam213
I'm not sure why adding the SortDescriptionfor Iddoes not work as it should work fine.
我不确定为什么添加SortDescriptionforId不起作用，因为它应该可以正常工作。
Like this:
像这样：
<CollectionViewSource x:Key="Items" Source="{Binding ElementName=UI, Path=Items}" >
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Description" />
<scm:SortDescription PropertyName="Id" />
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
I put together a full example of this working as you want:
我按照你的意愿整理了一个完整的例子：
Xaml:
Xml：
<Window x:Class="WpfApplication7.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:scm="clr-namespace:System.ComponentModel;assembly=WindowsBase"
Title="MainWindow" Height="124" Width="464" Name="UI" >
<Window.Resources>
<CollectionViewSource x:Key="Items" Source="{Binding ElementName=UI, Path=Items}" >
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Description" />
<scm:SortDescription PropertyName="Id" />
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
</Window.Resources>
<Grid>
<ListBox ItemsSource="{Binding Source={StaticResource Items}}" />
</Grid>
Code:
代码：
public partial class MainWindow : Window
{
private ObservableCollection<MyObject> myVar = new ObservableCollection<MyObject>();
public MainWindow()
{
InitializeComponent();
Items.Add(new MyObject { Description = "Stack", Id = 5 });
Items.Add(new MyObject { Description = "OverFlow", Id = 1 });
Items.Add(new MyObject { Description = "StackOverFlow", Id = 2 });
Items.Add(new MyObject { Description = "Stack", Id = 1 });
Items.Add(new MyObject { Description = "Stack", Id = 0 });
Items.Add(new MyObject { Description = "OverFlow", Id = 7 });
}
public ObservableCollection<MyObject> Items
{
get { return myVar; }
set { myVar = value; }
}
}
public class MyObject
{
public int Id { get; set; }
public string Description { get; set; }
public override string ToString()
{
return string.Format("Desc: {0}, Id: {1}", Description, Id);
}
}
Result:
结果：
回答by philu
@sa_ddam213's answer should work, but you don't need the extra ToString()method; all you need to add to your XAML is to turn IsLiveFilteringRequestedon, at least as in the .Net Framework 4.5.1.
@sa_ddam213 的答案应该有效，但您不需要额外的 ToString() 方法；您需要添加到 XAML 的所有内容就是打开IsLiveFilteringRequested，至少在 .Net Framework 4.5.1 中是这样。
<CollectionViewSource IsLiveFilteringRequested="True" x:Key="Items" Source="{Binding ElementName=UI, Path=Items}">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="Description" />
<scm:SortDescription PropertyName="Id" />
</CollectionViewSource.SortDescriptions>
回答by Rahbek
In my case I had a list of enums that had to be converted and then ordered. My code ended up looking like this with the help of the other answers.
就我而言，我有一个必须转换然后排序的枚举列表。在其他答案的帮助下，我的代码最终看起来像这样。
<CollectionViewSource x:Key="MyEnumList" Source="{Binding ListFromViewModel, Converter={StaticResource MyEnumConverter}}">
<CollectionViewSource.SortDescriptions>
<scm:SortDescription PropertyName="."/>
</CollectionViewSource.SortDescriptions>
</CollectionViewSource>
