MVVM DataGrid 从选定单元格复制信息

Question

我正在使用带有 MVVM 模式的 .Net 4.0 DataGrid。我需要使用户能够选择单元格并将信息从选定的单元格复制到其他 DataGrid 行(通过键盘快捷键或上下文菜单复制/粘贴)。我试图通过 SelectedItem 或将 SelectedItem 作为 CommandParameter 发送来实现这一点，但这仅适用于整行而不适用于单元格。
(DataGrid 绑定(bind)到包含具有浮点字段的对象的 ObservableCollection。然后将这些字段映射到 DataGrid 单元格)
那么，WPF MVVM 中是否有任何解决方案如何将 DataGrid 单元格从一行复制到另一行？
提前致谢
xml:

    <DataGrid Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="9" AutoGenerateColumns="False"     Height="Auto" HorizontalAlignment="Left" 
Name="dataGrid" VerticalAlignment="Top" Width="{Binding ElementName=grid4,Path=Width}"
ScrollViewer.CanContentScroll="False" FrozenColumnCount="1" SelectionUnit="Cell" SelectionMode="Extended" CanUserSortColumns = "False" 
CanUserReorderColumns="False" CanUserResizeRows="False" RowHeight="25" RowBackground="LightGray" AlternatingRowBackground="White"
ScrollViewer.VerticalScrollBarVisibility="Visible" ScrollViewer.HorizontalScrollBarVisibility="Visible"
ItemsSource="{Binding Layers, Mode=TwoWay}"  SelectedItem="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Window}}, Path=DataContext.Selection, Mode=TwoWay}">
 <DataGrid.InputBindings>
    <KeyBinding Gesture="Shift" Command="{Binding ItemHandler}" CommandParameter="{Binding ElementName=dataGrid, Path=SelectedItems}"></KeyBinding>
</DataGrid.InputBindings>

View 模型:

private float _selection = 0.0f;
public float Selection
{
    get
    {
        return _selection;
    }
    set
    {
        if (_selection != value)
        {
            _selection = value;
            NotifyPropertyChanged("Selection");
        }
    }
}

...

public DelegateCommand<IList> SelectionChangedCommand = new DelegateCommand<IList>(
    items =>
    {
        if (items == null)
        {
            NumberOfItemsSelected = 0; 
            return;
        }
        NumberOfItemsSelected = items.Count;
    });
public ICommand ItemHandler
{
    get
    {
        return SelectionChangedCommand;
    }
}

Answer 1

我想你可能会追求 SelectionUnit属性(property)。将此设置为 CellOrRowHeader将选择方法从整行更改为单个单元格。

你确实失去了“我在哪排？”突出显示，但您专注于单个单元格。 (您可能可以扩展数据网格以使用当前行逻辑添加您自己的突出显示。)

<DataGrid AutoGenerateColumns="True" Grid.Column="1" Grid.Row="0"
          HorizontalAlignment="Stretch" Name="dataGrid" VerticalAlignment="Stretch"
          DataContext="{Binding}" ItemsSource="{Binding Path=MyDataTable}"
          IsReadOnly="True" SelectionMode="Extended" SelectionUnit="CellOrRowHeader" />