回答編集履歴
1
見直しキャンペーン中
test
CHANGED
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@@ -1,265 +1,133 @@
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`ComboBox`の選択肢は個々のアイテム（`DataGrid`の行）の１項目であって、全く別のものであるはずです。
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-
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なので`Gender`と`Item`に分けました。
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`Gender`はクラスでもいいのですが、扱いにくいので列挙型にしました。
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列挙型と表示文字列の対応付けはいろいろありますが、元コードと近い`Dictionary`方式にしました。
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```xml
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<Window
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x:Class="Questions302281.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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Width="530"
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Height="350">
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<Window.Resources>
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<CollectionViewSource x:Key="GenderDictSource" Source="{Binding GenderDict}" />
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</Window.Resources>
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<Grid>
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<DataGrid
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AutoGenerateColumns="False"
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CanUserAddRows="False"
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ItemsSource="{Binding Items}">
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<DataGrid.Columns>
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<DataGridTemplateColumn Header="金額（税率）">
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<DataGridTemplateColumn.CellTemplate>
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<DataTemplate>
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<StackPanel Orientation="Horizontal">
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<TextBlock Text="{Binding Price, StringFormat={}{0} 円}" />
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<TextBlock Text="{Binding Tax, StringFormat=（{0}%）}" />
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</StackPanel>
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</DataTemplate>
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</DataGridTemplateColumn.CellTemplate>
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</DataGridTemplateColumn>
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<!--<DataGridTextColumn Header="金額（税率）">
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<DataGridTextColumn.Binding>
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<MultiBinding StringFormat="{}{0} 円（{1}%）">
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<Binding Path="Price" />
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<Binding Path="Tax" />
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</MultiBinding>
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</DataGridTextColumn.Binding>
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</DataGridTextColumn>-->
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```xaml
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<Window
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x:Class="Questions302281.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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Width="530"
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Height="350">
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<Window.Resources>
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<CollectionViewSource x:Key="GenderDictSource" Source="{Binding GenderDict}" />
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</Window.Resources>
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<Grid>
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<DataGrid
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AutoGenerateColumns="False"
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CanUserAddRows="False"
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ItemsSource="{Binding Items}">
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<DataGrid.Columns>
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<DataGridTemplateColumn Header="
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<DataGridTemplateColumn Header="コンボボックス列">
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<DataGridTemplateColumn.CellTemplate>
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<DataTemplate>
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<ComboBox
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DisplayMemberPath="Value"
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ItemsSource="{Binding DataContext.GenderDict, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}}"
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SelectedValue="{Binding Sex, UpdateSourceTrigger=PropertyChanged}"
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SelectedValuePath="Key" />
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<TextBlock Text="{Binding Price, StringFormat={}{0} 円}" />
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<TextBlock Text="{Binding Tax, StringFormat=（{0}%）}" />
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</StackPanel>
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</DataTemplate>
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</DataGridTemplateColumn.CellTemplate>
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</DataGridTemplateColumn>
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<!--<DataGridTextColumn Header="金額（税率）">
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<DataGridTextColumn.Binding>
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<MultiBinding StringFormat="{}{0} 円（{1}%）">
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<Binding Path="Price" />
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<Binding Path="Tax" />
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</MultiBinding>
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</DataGridTextColumn.Binding>
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</DataGridTextColumn>-->
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<DataGridTemplateColumn Header="コンボボックス列">
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<DataGridTemplateColumn.CellTemplate>
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<DataTemplate>
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<ComboBox
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DisplayMemberPath="Value"
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ItemsSource="{Binding DataContext.GenderDict, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type DataGrid}}}"
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SelectedValue="{Binding Sex, UpdateSourceTrigger=PropertyChanged}"
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SelectedValuePath="Key" />
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</DataTemplate>
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</DataGridTemplateColumn.CellTemplate>
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</DataGridTemplateColumn>
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<DataGridComboBoxColumn
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DisplayMemberPath="Value"
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Header="DataGridComboBoxColumn"
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ItemsSource="{Binding Source={StaticResource GenderDictSource}}"
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SelectedValueBinding="{Binding Sex}"
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SelectedValuePath="Key" />
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</DataGrid.Columns>
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</DataGrid>
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<Button
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HorizontalAlignment="Left"
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VerticalAlignment="Bottom"
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Click="Button_Click"
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Content="値の確認" />
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</Grid>
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</Window>
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```
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```
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```cs
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Diagnostics;
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using System.Windows;
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namespace Questions302281
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{
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public enum Gender
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{
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Unknown,
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Male,
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Female,
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}
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public class Item
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{
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public string Syouhinmei { get; set; }
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public int Price { get; set; }
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public double Tax { get; set; }
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public Gender Sex { get; set; }
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}
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public partial class MainWindow : Window
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{
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public Dictionary<Gender, string> GenderDict { get; }
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public ObservableCollection<Item> Items { get; }
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public MainWindow()
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{
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InitializeComponent();
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DataContext = this;
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GenderDict = new Dictionary<Gender, string>
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{
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{ Gender.Unknown, "？" },
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{ Gender.Male, "♂" },
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{ Gender.Female, "♀" },
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};
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Items = new ObservableCollection<Item>
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{
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new Item { Syouhinmei = "化粧品", Price = 1900, Tax = 10, Sex = Gender.Female },
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new Item { Syouhinmei = "洗剤", Price = 500, Tax = 10, Sex = Gender.Male },
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new Item { Syouhinmei = "パン", Price = 800, Tax = 8, Sex = Gender.Male },
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new Item { Syouhinmei = "牛乳", Price = 800, Tax = 8 },
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};
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}
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private void Button_Click(object sender, RoutedEventArgs e)
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{
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foreach(var irem in Items)
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{
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Debug.WriteLine($"Price:{irem.Price}, Sex:{irem.Sex}");
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}
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Debug.WriteLine("");
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}
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}
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}
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```
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265
133
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コード側から`Item`の中身を変更する場合は、ikarimameさんの言うように`INotifyPropertyChanged`の実装が必要です。
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