回答編集履歴
1
見直しキャンペーン中
test
CHANGED
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@@ -1,159 +1,80 @@
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簡単にやるなら`IsReadOnly="False"`のまま、通常行を`BeginningEdit`でキャンセルすることですかね。
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xamlだけでやれないこともなさそうなんですが、面倒そうなので考えるのを諦めました^^;
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xamlだけ（`BindingProxy`は除く）でやれないこともなさそうなんですが、面倒そうなので考えるのを諦めました^^;
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```x
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```xml
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<Window
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x:Class="Questions316745.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="800"
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Height="450">
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<Grid>
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<DataGrid
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AutoGenerateColumns="False"
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BeginningEdit="DataGrid_BeginningEdit"
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ItemsSource="{Binding Items}">
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<DataGrid.Columns>
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<!--<DataGridTextColumn Binding="{Binding Id}" Header="ID" IsReadOnly="True" />-->
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<DataGridTextColumn Binding="{Binding Id}" Header="ID" />
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<DataGridTextColumn Binding="{Binding Name}" Header="名前" />
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<DataGridTextColumn Binding="{Binding Description}" Header="説明" />
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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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```
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```cs
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using Prism.Mvvm;
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using System.Collections.ObjectModel;
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using System.Windows;
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using System.Windows.Controls;
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namespace Questions316745
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{
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public class Item : BindableBase
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{
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private int _Id;
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public int Id { get => _Id; set => SetProperty(ref _Id, value); }
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private string _Name;
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public string Name { get => _Name; set => SetProperty(ref _Name, value); }
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private string _Description;
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public string Description { get => _Description; set => SetProperty(ref _Description, value); }
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}
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public partial class MainWindow : Window
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{
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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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Items = new ObservableCollection<Item>
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{
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new Item{ Id = 1, Name = "hoge", Description = "aaa", },
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new Item{ Id = 2, Name = "fuga", Description = "bbb", },
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new Item{ Id = 3, Name = "piyo", Description = "ccc", },
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};
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DataContext = this;
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}
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private void DataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
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{
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// もうちょっとましな判定法あると思うｗ
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if (e.Column.Header.ToString() == "ID" && !e.Row.IsNewItem)
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e.Cancel = true;
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}
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}
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}
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```
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`INotifyPropertyChanged`に[Prism.Core](https://www.nuget.org/packages/Prism.Core/8.0.0.1909?_src=template)を使用しました。
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---
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しかしこういった要件というのは、ユニークなID等の列ではないのですか？
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158
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バリデーションをかけるなら既存行も編集可にしてもよいですし、自動採番なら新規行も編集させたくないですよね？
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