ListView WPF 中的项目分组
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Grouping of items in ListView WPF
提问by tavier
I have a ListView where I want to group the items based on a field of the item object. Below is the code I have:
我有一个 ListView，我想根据项目对象的字段对项目进行分组。下面是我的代码：
<ListView ItemsSource="{x:Bind MyVM.CollectionOfClassA, Mode=OneWay}"
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<TextBlock FontSize="15" FontWeight="Bold" Text="{Binding DateTimePropertyOfClassA}"/>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
Is there something I am missing? I want to group the items based on the DateTime property of ClassA objects. Also, if there is no item for any particular day, I would still like to show that date with empty list under that group (for that day). How can I achieve it?
有什么我想念的吗？我想根据 ClassA 对象的 DateTime 属性对项目进行分组。此外，如果任何特定日期都没有项目，我仍然希望在该组下显示该日期并带有空列表（当天）。我怎样才能实现它？
Edit: I am not able to use CollectionViewSource since my VM contains the collection of ClassA object (which is bound as item source to the listview) and I want to group the items based on one property of those ClassA objects. I am sure there is something I am missing out on. But I am not able to figure it out.
编辑：我无法使用 CollectionViewSource，因为我的 VM 包含 ClassA 对象的集合（它作为项目源绑定到列表视图），我想根据这些 ClassA 对象的一个属性对项目进行分组。我确定我错过了一些东西。但我无法弄清楚。
采纳答案by tavier
Here is the solution for anyone looking for it (thanks to the WPF masters out there https://social.msdn.microsoft.com/Forums/windowsapps/en-US/812ed260-e113-4a8b-9322-226ed56ac90c/grouping-of-items-in-listview-wpf?forum=wpdevelop&prof=required):
这是任何寻找它的人的解决方案（感谢那里的 WPF 大师https://social.msdn.microsoft.com/Forums/windowsapps/en-US/812ed260-e113-4a8b-9322-226ed56ac90c/grouping-of -items-in-listview-wpf?forum=wpdevelop&prof=required）：
public class ClassA
{
public DateTime DateTimePropertyOfClassA { get; set; }
}
public class MyVM
{
public MyVM()
{
//return a grouped collection:
Grouped = from x in CollectionOfClassA group x by x.DateTimePropertyOfClassA into grp orderby grp.Key select grp;
}
public IList<ClassA> CollectionOfClassA { get; set; } = new List<ClassA>()
{
new ClassA(){ DateTimePropertyOfClassA = DateTime.Parse("2016-01-01")},
new ClassA(){ DateTimePropertyOfClassA = DateTime.Parse("2016-03-01")},
new ClassA(){ DateTimePropertyOfClassA = DateTime.Parse("2016-03-01")},
new ClassA(){ DateTimePropertyOfClassA = DateTime.Parse("2016-03-01")},
new ClassA(){ DateTimePropertyOfClassA = DateTime.Parse("2016-03-01")},
new ClassA(){ DateTimePropertyOfClassA =DateTime.Parse("2016-06-01")}
};
public IEnumerable<object> Grouped { get; }
}
Xaml:
Xml：
<Page.Resources>
<CollectionViewSource x:Name="cvs"
IsSourceGrouped="True"
Source="{x:Bind MyVM.Grouped, Mode=OneWay}"/>
</Page.Resources>
<StackPanel Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
<ListView ItemsSource="{Binding Source={StaticResource cvs}}">
<ListView.GroupStyle>
<GroupStyle>
<GroupStyle.HeaderTemplate>
<DataTemplate>
<TextBlock FontSize="15" FontWeight="Bold" Text="{Binding Key}"/>
</DataTemplate>
</GroupStyle.HeaderTemplate>
</GroupStyle>
</ListView.GroupStyle>
</ListView>
</StackPanel>
回答by Petar Stojanovski
I suggest creating a collection in the ViewModel IObservableCollection<ClassA>Properties (or whatever name), add it in the MainWindow class and then simply bind it in the ListView.
我建议在 ViewModelIObservableCollection<ClassA>属性（或任何名称）中创建一个集合，将其添加到 MainWindow 类中，然后简单地将其绑定到 ListView 中。
<ListView ItemsSource="{Binding Path=Properties}">
