C＃WPF KeyDown高亮顯示+選中數據網格中的最后一行

Question

我正在開發一個應用程序，用戶可以使用簡單的信息（如產品名稱和價格）將產品添加到數據網格中，然后我想例如按鍵盤上的F4鍵，然后我要關注數據網格中的最后一項，這意味着選擇它並突出顯示該項目！

所以，伙計們，我該如何實現這一目標，我嘗試了一些解決方案，例如將選擇的索引設置為我的數據網格和類似的方法，但是它無法正常工作

謝謝大家，干杯

Answer 1

以編程方式突出顯示DataGrid的行或單元格比僅設置SelectedIndex或SelectedItem屬性要復雜一些。

但是，可以通過訪問DataGrid控件的可視用戶界面元素並在特定的DataGridCell對象上調用UIElement.Focus()方法來選擇並集中代碼中的一行，並獲得與使用鼠標時相同的行為，如下所述。以下博客文章。

如何在WPF中以編程方式選擇和突出顯示DataGrid中的行或單元格： https : //blog.magnusmontin.net/2013/11/08/how-to-programmatically-select-and-focus-a-row-or- WPF中的數據網格中的單元格/

這是一個例子：

public partial class MainWindow : Window
{
    public MainWindow
    {
        InitializeComponent();
        this.PreviewKeyDown += (s, e) => 
        {
            if(e.Key == Key.F4)
                SelectRowByIndex(dataGridProducts, dataGridProducts.Items.Count - 1);
        };

        //populate DataGrid etc...
    }

    private static void SelectRowByIndex(DataGrid dataGrid, int rowIndex)
    {
        if (!dataGrid.SelectionUnit.Equals(DataGridSelectionUnit.FullRow))
            throw new ArgumentException("The SelectionUnit of the DataGrid must be set to FullRow.");

        if (rowIndex < 0 || rowIndex > (dataGrid.Items.Count - 1))
            throw new ArgumentException(string.Format("{0} is an invalid row index.", rowIndex));

        dataGrid.SelectedItems.Clear();
        object item = dataGrid.Items[rowIndex];
        dataGrid.SelectedItem = item;

        DataGridRow row = dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow;
        if (row == null)
        {
            /* bring the data item (Product object) into view
             * in case it has been virtualized away */
            dataGrid.ScrollIntoView(item);
            row = dataGrid.ItemContainerGenerator.ContainerFromIndex(rowIndex) as DataGridRow;
        }
        if (row != null)
        {
            DataGridCell cell = GetCell(dataGrid, row, 0);
            if (cell != null)
                cell.Focus();
        }
    }

    private static DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
    {
        if (rowContainer != null)
        {
            System.Windows.Controls.Primitives.DataGridCellsPresenter presenter 
                = FindVisualChild<System.Windows.Controls.Primitives.DataGridCellsPresenter>(rowContainer);
            if (presenter == null)
            {
                /* if the row has been virtualized away, call its ApplyTemplate() method 
                 * to build its visual tree in order for the DataGridCellsPresenter
                 * and the DataGridCells to be created */
                rowContainer.ApplyTemplate();
                presenter = FindVisualChild<System.Windows.Controls.Primitives.DataGridCellsPresenter>(rowContainer);
            }
            if (presenter != null)
            {
                DataGridCell cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
                if (cell == null)
                {
                    /* bring the column into view
                     * in case it has been virtualized away */
                    dataGrid.ScrollIntoView(rowContainer, dataGrid.Columns[column]);
                    cell = presenter.ItemContainerGenerator.ContainerFromIndex(column) as DataGridCell;
                }
                return cell;
            }
        }
        return null;
    }

    private static T FindVisualChild<T>(DependencyObject obj) where T : DependencyObject
    {
        for (int i = 0; i < VisualTreeHelper.GetChildrenCount(obj); i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(obj, i);
            if (child != null && child is T)
                return (T)child;
            else
            {
                T childOfChild = FindVisualChild<T>(child);
                if (childOfChild != null)
                    return childOfChild;
            }
        }
        return null;
    }
}

Answer 2

您可以使用InputBinding識別按下的F4鍵。

<Window.InputBindings>
    <KeyBinding Key="F4"
                Command="{Binding SelectLastItemCommand}" />
</Window.InputBindings>

您可以在此處查看如何選擇項目： DataGrid中的WPF Binding SelectedItem

Answer 3

你的問題在哪里？ 處理按鈕事件還是突出顯示行？ 似乎是后者，因此請看一下： https : //www.codeproject.com/Tips/773382/Row-Highlighting-in-WPF-Grids