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[WPF/xaml] ListViewをグループ表示する(xamlで書く)

Last updated at Posted at 2021-06-12

もくじ

やりたいこと

Grid表示のListViewの中身を、ある列の内容でグループ表示したい。下記のようなイメージ。
image.png

やり方

<CollectionViewSource>を使う。

MainWindow.xaml
<Window x:Class="WpfApp48.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:WpfApp48"
        mc:Ignorable="d"
        Title="MainWindow" Height="300" Width="200">
    <Window.Resources>        
        <!-- 何のくくりでグループを作るか指定 -->
        <CollectionViewSource x:Key="cvSource" Source="{Binding DataList}" >
            <CollectionViewSource.GroupDescriptions>
                <PropertyGroupDescription PropertyName="PilotName"/>
            </CollectionViewSource.GroupDescriptions>
        </CollectionViewSource>

        <!-- グループのヘッダのスタイルを作成 -->
        <DataTemplate x:Key="GroupHeaderTemplate">
            <Border Background="#FFCDF2CD">
                <TextBlock Text="{Binding Name}" FontWeight="Bold"/>
            </Border>
        </DataTemplate>
    </Window.Resources>
    
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="10*"/>
            <RowDefinition Height="1*"/>
        </Grid.RowDefinitions>

        <ListView Name="MainList" ItemsSource="{Binding Source={StaticResource cvSource}}">

            <!-- グループのヘッダのスタイルを指定 -->
            <ListView.GroupStyle>
                <GroupStyle HeaderTemplate="{StaticResource GroupHeaderTemplate}" />
            </ListView.GroupStyle>
            <ListView.View>
                <GridView>
                    <GridViewColumn Header="機体" DisplayMemberBinding="{Binding MachineName}" Width="80" />
                    <GridViewColumn Header="パイロット" DisplayMemberBinding="{Binding PilotName}" Width="80" />
                </GridView>
            </ListView.View>
        </ListView>

        <Button Grid.Row="1" Content="ボタン" Click="Button_Click"/>

    </Grid>
</Window>
MainWindow.xaml.cs
using System;
using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Windows;
using System.Windows.Data;

namespace WpfApp48
{
    public partial class MainWindow : Window, INotifyPropertyChanged
    {
        #region INotifyPropertyChanged
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged(string propertyName)=> this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        #endregion
        
        // ガンダム情報を格納
        public ObservableCollection<MyData> DataList { get; set; } = new ObservableCollection<MyData>();
        
        public MainWindow()
        {
            InitializeComponent();
            this.DataContext = this;
        }

        // ボタンをおしたらデータの中身を追加
        private void Button_Click(object sender, RoutedEventArgs e)
        {
            DataList.Add(new MyData() { MachineName = "ガンダム", PilotName = "アムロ" });
            DataList.Add(new MyData() { MachineName = "シャアザク", PilotName = "シャア" });
            DataList.Add(new MyData() { MachineName = "グフ", PilotName = "誰やったっけ?" });
            DataList.Add(new MyData() { MachineName = "Zガンダム", PilotName = "カミーユ" });
            DataList.Add(new MyData() { MachineName = "ガンダムmk-Ⅱ", PilotName = "アムロ" });
            DataList.Add(new MyData() { MachineName = "ジ・オ", PilotName = "シロッコ" });
            DataList.Add(new MyData() { MachineName = "百式", PilotName = "シャア" });
            DataList.Add(new MyData() { MachineName = "ZZガンダム", PilotName = "ジュドー" });
            DataList.Add(new MyData() { MachineName = "νガンダム", PilotName = "アムロ" });
        }
    }

    /// <summary>
    /// ガンダム情報クラス
    /// </summary>
    public class MyData
    {
        public string MachineName { get; set; }
        public string PilotName { get; set; }
    }
}

結果、最初に張り付けた画面のようになる。

参考

コードでやるやり方

xamlでやるやり方等

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