wpf ListCollectionView - GroupDescriptions - 如何获得分组的项目数？
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ListCollectionView - GroupDescriptions - How to get grouped items count?
提问by Anand Murali
I have an instance of ListCollectionViewwhich is grouped using PropertyGroupDescriptionas shown below
我有一个实例，ListCollectionView使用PropertyGroupDescription如下所示进行分组
ListCollectionView view = new ListCollectionView(calls);
view.GroupDescriptions.Add(new PropertyGroupDescription("Technician.Name"));
DGCalls.ItemsSource = view;
The grouping works fine, but I want to display the count of grouped items as shown below.
分组工作正常，但我想显示分组项目的数量，如下所示。
Is it possible to display the count?
是否可以显示计数？
Here is the sample app that I created.
这是我创建的示例应用程序。
Code behind:
后面的代码：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace WpfApplication1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
Technician tech1 = new Technician() { Name = "Tech01" };
Technician tech2 = new Technician() { Name = "Tech02" };
List<ServiceCall> calls = new List<ServiceCall>();
calls.Add(new ServiceCall() { ID = 1, Technician = tech1});
calls.Add(new ServiceCall() { ID = 2, Technician = tech1 });
calls.Add(new ServiceCall() { ID = 3, Technician = tech1 });
calls.Add(new ServiceCall() { ID = 4, Technician = tech2 });
calls.Add(new ServiceCall() { ID = 5, Technician = tech2 });
ListCollectionView view = new ListCollectionView(calls);
view.GroupDescriptions.Add(new PropertyGroupDescription("Technician.Name"));
DGCalls.ItemsSource = view;
}
}
public class ServiceCall
{
public int ID { get; set; }
public Technician Technician { get; set; }
}
public class Technician
{
public String Name { get; set; }
}
}
XAML:
XAML：
<Grid>
<Grid.Resources>
<Style x:Key="GroupHeaderStyle" TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True" Background="Blue" >
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" Foreground="White" FontWeight="Bold"/>
<TextBlock Text="{Binding Count}" Foreground="White" FontWeight="Bold"/>
</StackPanel>
</Expander.Header>
<ItemsPresenter/>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<DataGrid Name="DGCalls" AutoGenerateColumns="False" IsReadOnly="True">
<DataGrid.Columns>
<DataGridTextColumn Header="Call ID" Binding="{Binding ID}"/>
<DataGridTextColumn Header="Technician Name" Binding="{Binding Technician.Name}"/>
</DataGrid.Columns>
<DataGrid.GroupStyle>
<GroupStyle ContainerStyle="{StaticResource GroupHeaderStyle}">
<GroupStyle.Panel>
<ItemsPanelTemplate>
<DataGridRowsPresenter/>
</ItemsPanelTemplate>
</GroupStyle.Panel>
</GroupStyle>
</DataGrid.GroupStyle>
</DataGrid>
</Grid>
采纳答案by mathieu
Just use the ItemCountproperty of the CollectionViewSource :
只需使用CollectionViewSource的ItemCount属性：
<Style x:Key="GroupHeaderStyle" TargetType="{x:Type GroupItem}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type GroupItem}">
<Expander IsExpanded="True" Background="Blue" >
<Expander.Header>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" Foreground="White" FontWeight="Bold"/>
<TextBlock Text="{Binding ItemCount}" Foreground="White" FontWeight="Bold"/>
</StackPanel>
</Expander.Header>
<ItemsPresenter/>
</Expander>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
