我是 .Net 和 C# 的新手,对绑定有点困惑。我有实现 MVVM 并显示 DataGrid 的应用程序。我想要实现的是,当用户按下某个组合键时,当前选定单元格的内容会被复制到下面行中的单元格中。我尝试将 DataGrid 的 SelectedItem 绑定到 ViewModel 属性,但它永远不会更新。CommandParameter 也不起作用,项目计数始终为 0。所以我无法提取用户选择的单元格,也无法读取所选单元格的内容。有没有人建议如何解决这个问题或实现这个功能?提前致谢。代码: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>
</DataGrid>
视图模型:
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;
}
}