回答編集履歴
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実装例追記
test
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個人的には良い（MVVMを逸脱していない）と思っていますが、ビヘイビアに追い出せばMVVM厳格派の方も納得するでしょうｗ
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[【WPF】Behaviorの実装方法【MVVM】 #WPF - Qiita](https://qiita.com/tkhshiq/items/89b13dc293fb3cd32849)
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## 実装例追記
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> 無効な値(重複など)が含まれている場合にコミットをせずに編集状態を続行したい。
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ユニークな値は`Id`のつもりでしょうか？
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そのような値はデータベースの自動採番等で、ユーザーが編集する類のものではないような...
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それともユーザー名のような、任意の値でいいけど被ってはいけないものでしょうか？
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[validation - Wpf datagrid validationrule for unique field - Stack Overflow](https://stackoverflow.com/questions/10548357/wpf-datagrid-validationrule-for-unique-field)
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```xml
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<Window
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x:Class="Q3g1ql395qrqjbx.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:local="clr-namespace:Q3g1ql395qrqjbx"
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Width="400"
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Height="400">
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<Window.Resources>
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<Style
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x:Key="errorStyle"
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BasedOn="{x:Static DataGridTextColumn.DefaultEditingElementStyle}"
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TargetType="{x:Type TextBox}">
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<Setter Property="Validation.ErrorTemplate">
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<Setter.Value>
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<ControlTemplate>
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<StackPanel>
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<Grid>
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<AdornedElementPlaceholder x:Name="element" />
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<Border
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Width="{Binding AdornedElement.ActualWidth, ElementName=element}"
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HorizontalAlignment="Left"
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BorderBrush="Red"
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BorderThickness="1" />
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</Grid>
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<ItemsControl
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Background="Snow"
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DisplayMemberPath="ErrorContent"
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Foreground="Red"
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ItemsSource="{Binding}" />
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</StackPanel>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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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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InitializingNewItem="DataGrid_InitializingNewItem"
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ItemsSource="{Binding Examples}"
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RowValidationErrorTemplate="{x:Null}">
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<DataGrid.Resources>
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<CollectionViewSource x:Key="examples" Source="{Binding Examples}" />
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</DataGrid.Resources>
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<DataGrid.Columns>
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<DataGridTextColumn
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Width="*"
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Binding="{Binding Id}"
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Header="Id"
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IsReadOnly="True" />
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<DataGridTextColumn
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Width="5*"
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EditingElementStyle="{StaticResource errorStyle}"
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Header="Name">
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<DataGridTextColumn.Binding>
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<Binding Path="Name" UpdateSourceTrigger="PropertyChanged">
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<Binding.ValidationRules>
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<local:UniqueNameRule
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CurrentCollection="{StaticResource examples}"
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ValidatesOnTargetUpdated="True"
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ValidationStep="UpdatedValue" />
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</Binding.ValidationRules>
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</Binding>
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</DataGridTextColumn.Binding>
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</DataGridTextColumn>
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<DataGridCheckBoxColumn Binding="{Binding Enabled}" Header="Enabled" />
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</DataGrid.Columns>
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</DataGrid>
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</Grid>
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</Window>
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```
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```cs
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Globalization;
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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 Q3g1ql395qrqjbx;
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public partial class MainWindow : Window
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{
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public ObservableCollection<Example> Examples { 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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Examples = new(Enumerable.Range(1, 5).Select(x => new Example { Id = x, Name = $"Example{x}", }));
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}
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private void DataGrid_InitializingNewItem(object sender, InitializingNewItemEventArgs e)
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{
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if (e.NewItem is Example example)
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example.Id = Examples.Max(x => x.Id) + 1;
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}
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}
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public record Example : IEditableObject
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{
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public int Id { get; set; }
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public string? Name { get; set; }
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public bool Enabled { get; set; }
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private Example? backup;
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public void BeginEdit() => backup = this with { };
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public void CancelEdit() => (Id, Name, Enabled) = (backup!.Id, backup.Name, backup.Enabled);
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public void EndEdit() => backup = null;
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}
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// [validation - Wpf datagrid validationrule for unique field - Stack Overflow](https://stackoverflow.com/questions/10548357/wpf-datagrid-validationrule-for-unique-field)
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public class UniqueNameRule : ValidationRule
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{
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public CollectionViewSource? CurrentCollection { get; set; }
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public override ValidationResult Validate(object value, CultureInfo cultureInfo)
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{
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if (value is BindingExpression { DataItem: Example current })
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{
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foreach (var other in (Collection<Example>)CurrentCollection!.Source)
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{
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if (ReferenceEquals(current, other)) continue;
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if (current.Name == other.Name)
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return new ValidationResult(false, $"{current.Name}はすでに使用されています。");
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}
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}
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return ValidationResult.ValidResult;
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}
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}
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```
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