如何通过一个属性对CollectionViewSource进行排序,然后将另一个属性排序为抢七？

Question

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？

我已经尝试添加第二个SortDescription与PropertyName ="Id",但这没有奏效.

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

编辑: ID属性在viewmodel上是私有的.没有错误抛出.

Answer 1

我不确定为什么添加SortDescriptionfor Id不起作用,因为它应该工作正常.

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>

我根据你的需要整理了一个完整的例子:

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>

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: