WINUI 3 Community Toolkit DataGrid能否按行设置IsReadOnly？

这个需求完全可行，核心思路是通过绑定每行的可编辑状态，结合DataGrid的属性或事件控制编辑权限，具体实现步骤如下：

1. 准备数据实体类 #

给你的数据实体添加IsRowEditable布尔属性，用来标记当前行是否允许编辑，需实现INotifyPropertyChanged通知UI更新：

public class YourDataItem : INotifyPropertyChanged
{
    // 原有业务属性示例
    public string Name { get; set; }
    public int Age { get; set; }

    private bool _isRowEditable;
    public bool IsRowEditable
    {
        get => _isRowEditable;
        set
        {
            _isRowEditable = value;
            OnPropertyChanged();
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

2. 配置DataGrid的XAML #

• 先将DataGrid的IsReadOnly设为True，确保整体默认只读
• 给需要编辑的列，将IsReadOnly绑定到实体IsRowEditable的反值（因为IsReadOnly=True时不可编辑，所以当IsRowEditable=True时，列需设为可编辑）
• 绑定DataGrid的SelectedItem到ViewModel的选中项，方便后续修改状态

示例XAML：

<Page.Resources>
    <local:BooleanNegationConverter x:Key="BooleanNegationConverter"/>
</Page.Resources>

<controls:DataGrid x:Name="YourDataGrid"
                   IsReadOnly="True"
                   ItemsSource="{Binding YourDataList}"
                   SelectedItem="{Binding SelectedDataItem}">
    <controls:DataGrid.Columns>
        <controls:DataGridTextColumn Header="姓名"
                                     Binding="{Binding Name}"
                                     IsReadOnly="{Binding IsRowEditable, Converter={StaticResource BooleanNegationConverter}}"/>
        <controls:DataGridTextColumn Header="年龄"
                                     Binding="{Binding Age}"
                                     IsReadOnly="{Binding IsRowEditable, Converter={StaticResource BooleanNegationConverter}}"/>
        <!-- 其他列按此逻辑配置 -->
    </controls:DataGrid.Columns>
</controls:DataGrid>

<!-- 编辑按钮 -->
<Button Content="编辑选中行"
        Command="{Binding EditSelectedRowCommand}"/>

其中BooleanNegationConverter是布尔取反转换器，实现代码如下：

public class BooleanNegationConverter : IValueConverter
{
    public object Convert(object value, Type targetType, object parameter, string language)
    {
        return !(bool)value;
    }

    public object ConvertBack(object value, Type targetType, object parameter, string language)
    {
        return !(bool)value;
    }
}

3. ViewModel中实现编辑逻辑 #

在ViewModel里处理编辑按钮命令，将选中行的IsRowEditable设为True，并触发DataGrid进入编辑状态：

public class YourViewModel : INotifyPropertyChanged
{
    public ObservableCollection<YourDataItem> YourDataList { get; set; } = new ObservableCollection<YourDataItem>();

    private YourDataItem _selectedDataItem;
    public YourDataItem SelectedDataItem
    {
        get => _selectedDataItem;
        set
        {
            _selectedDataItem = value;
            OnPropertyChanged();
        }
    }

    public ICommand EditSelectedRowCommand => new RelayCommand(EditSelectedRow);

    private void EditSelectedRow()
    {
        if (SelectedDataItem == null) return;

        // 可选：将所有行设为不可编辑，确保仅选中行可编辑
        foreach (var item in YourDataList)
        {
            item.IsRowEditable = false;
        }

        // 激活选中行的编辑状态
        SelectedDataItem.IsRowEditable = true;

        // 触发DataGrid进入编辑模式，定位到选中行
        YourDataGrid.DispatcherQueue.TryEnqueue(() =>
        {
            YourDataGrid.ScrollIntoView(SelectedDataItem);
            YourDataGrid.BeginEdit();
        });
    }

    // INotifyPropertyChanged实现
    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged([CallerMemberName] string propertyName = null)
    {
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
    }
}

4. 替代方案：通过事件控制编辑 #

如果不想用列绑定，也可以通过DataGrid的BeginningEdit事件控制编辑权限：

private void YourDataGrid_BeginningEdit(object sender, DataGridBeginningEditEventArgs e)
{
    var item = e.Row.DataContext as YourDataItem;
    if (item != null && !item.IsRowEditable)
    {
        e.Cancel = true;
    }
}

内容的提问来源于stack exchange，提问作者CloudFrugality