c# - 获取 WPF 数据网格上下文菜单单击行

Question

我有一个 WPF 数据网格

<DataGrid AutoGenerateColumns="False"  Name="dataGrid1"  IsReadOnly="True" >
<DataGrid.Columns>
    <DataGridTextColumn Header="Site" Binding="{Binding Site}" Width="150" />
    <DataGridTextColumn Header="Subject" Binding="{Binding Subject}" Width="310" />
</DataGrid.Columns>
<DataGrid.ContextMenu>
    <ContextMenu>
        <MenuItem Header="Delete" Click="Context_Delete">
            <MenuItem.Icon>
                <Image Width="12" Height="12" Source="Images/Delete.png" />
            </MenuItem.Icon>
        </MenuItem>
    </ContextMenu>
</DataGrid.ContextMenu>
</DataGrid>

我将点击事件处理程序设置为:

private void Context_Delete(object sender, System.EventArgs e)  { }

如何获取单击前上下文菜单所在的行？ sender 对象是 System.Windows.Controls.MenuItem，而不是 DataGridRow。如何获取单击上下文菜单的 DataGridRow。 (我在代码隐藏文件中设置了 DataGrid.ItemSource。)

Answer 1

因此，根据您的示例代码，我假设您将 DataGrid 绑定(bind)到对象的 ObservableCollection，您将其属性 Site 和 Subject 绑定(bind)到 DataGridColumns。

基本上，您需要做的就是弄清楚绑定(bind)到单击的 DataGridRow 的项目是什么，并将其从 ObservableCollection 中删除。下面是一些帮助您入门的示例代码:

private void Context_Delete(object sender, RoutedEventArgs e)
{
    //Get the clicked MenuItem
    var menuItem = (MenuItem)sender;

    //Get the ContextMenu to which the menuItem belongs
    var contextMenu = (ContextMenu)menuItem.Parent;

    //Find the placementTarget
    var item = (DataGrid)contextMenu.PlacementTarget;

    //Get the underlying item, that you cast to your object that is bound
    //to the DataGrid (and has subject and state as property)
    var toDeleteFromBindedList = (YourObject)item.SelectedCells[0].Item;

    //Remove the toDeleteFromBindedList object from your ObservableCollection
    yourObservableCollection.Remove(toDeleteFromBindedList);
}