2013-02-20 119 views
13

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。我如何指定先按描述进行排序,然后按ID排序?如何对一个属性对CollectionViewSource进行排序,然后将另一个属性作为tiebreak进行排序?

我试着用PropertyName =“Id”添加第二个SortDescription,但那没有奏效。

<CollectionViewSource x:Key="Items" Source="{Binding Items}" > 
<CollectionViewSource.SortDescriptions> 
<scm:SortDescription PropertyName="Description"/> 
</CollectionViewSource.SortDescriptions> 
</CollectionViewSource> 

编辑: ID属性是在视图模型私人。没有错误抛出。

+1

或许这将帮助? http://stackoverflow.com/q/6469303/56778 – 2013-02-21 00:08:30

回答

33

我不确定为什么要为Id添加SortDescription不起作用,因为它应该可以正常工作。

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> 

我放在一起这个工作的一个完整的例子,只要你想:

的XAML:

<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> 

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); 
    } 
} 

结果:

enter image description here

+0

值得注意的是,在调用InitializeComponents之前,需要实例化myVar集合。 – Jono 2017-02-26 18:17:02

0

@ sa_ddam213的答案应该工作,但你并不需要额外的ToString()方法;所有您需要添加到您的XAML的是至少在.Net Framework 4.5.1中打开IsLiveFilteringRequested

<CollectionViewSource IsLiveFilteringRequested="True" x:Key="Items" Source="{Binding ElementName=UI, Path=Items}"> 
    <CollectionViewSource.SortDescriptions> 
     <scm:SortDescription PropertyName="Description" /> 
     <scm:SortDescription PropertyName="Id" /> 
    </CollectionViewSource.SortDescriptions> 

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