回答編集履歴
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見直しキャンペーン中
answer
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> 複数選択情報をプロパティにバインドする方法はないでしょうか？
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`DataGrid`には`SelectedItems`がありますが、残念ながらバインドできません。
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[MultiSelector.SelectedItems プロパティ (System.Windows.Controls.Primitives) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.controls.primitives.multiselector.selecteditems)
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こちらはどうでしょうか。
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[WPFのDataGridで選択された複数のアイテムをバインドするためのビヘイビア - chorus log](http://chorusde.hatenablog.jp/entry/2013/02/28/064747)
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`DataGridRow`の`IsSelected`に個々のアイテムのboolをバインドするような方法も見ますが、仮想化が有効だとまともに動きませんので事実上使えません。
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```
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<Window
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x:Class="Questions338172.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:Behaviors="http://schemas.microsoft.com/xaml/behaviors"
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xmlns:local="clr-namespace:Questions338172"
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Width="800"
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Height="450">
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<Window.DataContext>
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<local:ViewModel />
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</Window.DataContext>
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<Grid>
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<Grid.ColumnDefinitions>
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<ColumnDefinition />
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<ColumnDefinition />
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</Grid.ColumnDefinitions>
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<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Items}">
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<Behaviors:Interaction.Behaviors>
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<local:BindSelectedItemsBehavior SelectedItems="{Binding SelectedItems}" />
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</Behaviors:Interaction.Behaviors>
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<DataGrid.Columns>
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<DataGridTextColumn
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Width="*"
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Binding="{Binding Text}"
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Header="Text" />
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</DataGrid.Columns>
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</DataGrid>
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<GroupBox Grid.Column="1" Header="Selected Items">
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<DockPanel>
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<TextBlock DockPanel.Dock="Top" Text="{Binding SelectedItems.Count, StringFormat=Count: {0}}" />
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<ListBox DisplayMemberPath="Text" ItemsSource="{Binding SelectedItems}" />
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</DockPanel>
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</GroupBox>
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</Grid>
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</Window>
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```
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```
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using CommunityToolkit.Mvvm.ComponentModel;
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using Microsoft.Xaml.Behaviors;
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using System.Collections;
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using System.Collections.ObjectModel;
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using System.Linq;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Data;
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namespace Questions338172
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{
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// [WPFのDataGridで選択された複数のアイテムをバインドするためのビヘイビア - chorus log](http://chorusde.hatenablog.jp/entry/2013/02/28/064747)
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class BindSelectedItemsBehavior : Behavior<DataGrid>
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{
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public static DependencyProperty SelectedItemsProperty
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= DependencyProperty.Register(nameof(SelectedItems), typeof(IList), typeof(BindSelectedItemsBehavior),
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new PropertyMetadata(null));
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public IList SelectedItems { get => (IList)GetValue(SelectedItemsProperty); set => SetValue(SelectedItemsProperty, value); }
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protected override void OnAttached() => AssociatedObject.SelectionChanged += SelectionChanged;
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protected override void OnDetaching() => AssociatedObject.SelectionChanged -= SelectionChanged;
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private void SelectionChanged(object sender, SelectionChangedEventArgs e)
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{
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if (SelectedItems == null) return;
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foreach (var addedItem in e.AddedItems)
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{
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if (addedItem == CollectionView.NewItemPlaceholder) continue;
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SelectedItems.Add(addedItem);
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}
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foreach (var removedItem in e.RemovedItems)
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SelectedItems.Remove(removedItem);
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}
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}
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class Item
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{
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public string Text { get; set; }
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}
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class ViewModel
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{
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public ObservableCollection<Item> Items { get; }
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public ObservableCollection<Item> SelectedItems { get; }
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public ViewModel()
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{
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Items = new ObservableCollection<Item>(Enumerable.Range(0, 1_000).Select(x => new Item { Text = $"Item{x}" }));
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SelectedItems = new ObservableCollection<Item>();
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}
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}
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public partial class MainWindow : Window
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{
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public MainWindow() => InitializeComponent();
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}
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}
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```
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110
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-
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111
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-
こちらを使用しています。
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1
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+
> 複数選択情報をプロパティにバインドする方法はないでしょうか？
|
|
2
|
+
|
|
3
|
+
`DataGrid`には`SelectedItems`がありますが、残念ながらバインドできません。
|
|
4
|
+
[MultiSelector.SelectedItems プロパティ (System.Windows.Controls.Primitives) | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/api/system.windows.controls.primitives.multiselector.selecteditems)
|
|
5
|
+
|
|
6
|
+
こちらはどうでしょうか。
|
|
7
|
+
[WPFのDataGridで選択された複数のアイテムをバインドするためのビヘイビア - chorus log](http://chorusde.hatenablog.jp/entry/2013/02/28/064747)
|
|
8
|
+
|
|
9
|
+
`DataGridRow`の`IsSelected`に個々のアイテムのboolをバインドするような方法も見ますが、仮想化が有効だとまともに動きませんので事実上使えません。
|
|
10
|
+
|
|
11
|
+
```xml
|
|
12
|
+
<Window
|
|
13
|
+
x:Class="Questions338172.MainWindow"
|
|
14
|
+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
|
|
15
|
+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
|
|
16
|
+
xmlns:Behaviors="http://schemas.microsoft.com/xaml/behaviors"
|
|
17
|
+
xmlns:local="clr-namespace:Questions338172"
|
|
18
|
+
Width="800"
|
|
19
|
+
Height="450">
|
|
20
|
+
<Window.DataContext>
|
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21
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+
<local:ViewModel />
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22
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</Window.DataContext>
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23
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+
<Grid>
|
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24
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+
<Grid.ColumnDefinitions>
|
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25
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+
<ColumnDefinition />
|
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26
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+
<ColumnDefinition />
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|
27
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+
</Grid.ColumnDefinitions>
|
|
28
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+
<DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Items}">
|
|
29
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+
<Behaviors:Interaction.Behaviors>
|
|
30
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+
<local:BindSelectedItemsBehavior SelectedItems="{Binding SelectedItems}" />
|
|
31
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+
</Behaviors:Interaction.Behaviors>
|
|
32
|
+
<DataGrid.Columns>
|
|
33
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+
<DataGridTextColumn
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|
34
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+
Width="*"
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35
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Binding="{Binding Text}"
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36
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Header="Text" />
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37
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+
</DataGrid.Columns>
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38
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+
</DataGrid>
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39
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+
<GroupBox Grid.Column="1" Header="Selected Items">
|
|
40
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+
<DockPanel>
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41
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+
<TextBlock DockPanel.Dock="Top" Text="{Binding SelectedItems.Count, StringFormat=Count: {0}}" />
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42
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<ListBox DisplayMemberPath="Text" ItemsSource="{Binding SelectedItems}" />
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43
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</DockPanel>
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44
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</GroupBox>
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45
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</Grid>
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46
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</Window>
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|
47
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+
```
|
|
48
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+
|
|
49
|
+
```cs
|
|
50
|
+
using CommunityToolkit.Mvvm.ComponentModel;
|
|
51
|
+
using Microsoft.Xaml.Behaviors;
|
|
52
|
+
using System.Collections;
|
|
53
|
+
using System.Collections.ObjectModel;
|
|
54
|
+
using System.Linq;
|
|
55
|
+
using System.Windows;
|
|
56
|
+
using System.Windows.Controls;
|
|
57
|
+
using System.Windows.Data;
|
|
58
|
+
|
|
59
|
+
namespace Questions338172
|
|
60
|
+
{
|
|
61
|
+
// [WPFのDataGridで選択された複数のアイテムをバインドするためのビヘイビア - chorus log](http://chorusde.hatenablog.jp/entry/2013/02/28/064747)
|
|
62
|
+
class BindSelectedItemsBehavior : Behavior<DataGrid>
|
|
63
|
+
{
|
|
64
|
+
public static DependencyProperty SelectedItemsProperty
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|
65
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= DependencyProperty.Register(nameof(SelectedItems), typeof(IList), typeof(BindSelectedItemsBehavior),
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66
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new PropertyMetadata(null));
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67
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public IList SelectedItems { get => (IList)GetValue(SelectedItemsProperty); set => SetValue(SelectedItemsProperty, value); }
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68
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+
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69
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protected override void OnAttached() => AssociatedObject.SelectionChanged += SelectionChanged;
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70
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protected override void OnDetaching() => AssociatedObject.SelectionChanged -= SelectionChanged;
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71
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+
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72
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private void SelectionChanged(object sender, SelectionChangedEventArgs e)
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73
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{
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74
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if (SelectedItems == null) return;
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75
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+
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76
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+
foreach (var addedItem in e.AddedItems)
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77
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{
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78
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if (addedItem == CollectionView.NewItemPlaceholder) continue;
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SelectedItems.Add(addedItem);
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80
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}
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81
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+
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foreach (var removedItem in e.RemovedItems)
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SelectedItems.Remove(removedItem);
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84
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}
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85
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}
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86
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+
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class Item
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{
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public string Text { get; set; }
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}
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+
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class ViewModel
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{
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public ObservableCollection<Item> Items { get; }
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public ObservableCollection<Item> SelectedItems { get; }
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public ViewModel()
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{
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Items = new ObservableCollection<Item>(Enumerable.Range(0, 1_000).Select(x => new Item { Text = $"Item{x}" }));
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SelectedItems = new ObservableCollection<Item>();
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101
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}
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102
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}
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103
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+
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104
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public partial class MainWindow : Window
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105
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{
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106
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public MainWindow() => InitializeComponent();
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107
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}
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108
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}
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109
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```
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110
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111
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+
こちらを使用しています。
|
|
112
112
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[NuGet Gallery | Microsoft.Xaml.Behaviors.Wpf 1.1.31](https://www.nuget.org/packages/Microsoft.Xaml.Behaviors.Wpf/1.1.31)
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