WPF 后台实现按数字键滚动DataGrid 当前选中项

　　最近遇到个项目，设备上没有鼠标，界面为全屏的一个DataGrid，需要实现按小键盘的0和1让DataGrid的当前选中行进行上下滚动

　　起到重要参考的是：   https://blog.csdn.net/sinat_31608641/article/details/105428496    实现后台滚动到当前选中项。
      现在把主要实现方式做个笔记：

　　首先，前台一定要设置VirtualizingStackPanel.IsVirtualizing="False"

　　接下来，是两个公共方法：

　　

/// <summary>        /// 将SelectedItem滚动为第一行        /// </summary>        /// <param name="dataGrid">目标DagaGrid</param>        /// <param name="selectedItem">选中项</param>        public static void SetSelectedItemFirstRow(object dataGrid, object selectedItem)        {            //若目标datagrid为空，抛出异常            if (dataGrid == null)            {                throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");            }            //获取目标DataGrid，为空则抛出异常            System.Windows.Controls.DataGrid dg = dataGrid as System.Windows.Controls.DataGrid;            if (dg == null)            {                throw new ArgumentNullException("目标无" + dataGrid + "无法转换为DataGrid");            }            //数据源为空则返回            if (dg.Items == null || dg.Items.Count < 1)            {                return;            }            //获取焦点，滚动为目标行            dg.Focus();            dg.SelectedItem = selectedItem;            dg.CurrentColumn = dg.Columns[0];            dg.ScrollIntoView(dg.SelectedItem, dg.CurrentColumn);        }        /// <summary>        /// 获取选中的行        /// </summary>        /// <param name="datagrid"></param>        /// <param name="rowIndex"></param>        /// <returns></returns>        public static DataGridRow GetDataGridRow(DataGrid datagrid, int rowIndex)        {            DataGridRow row = (DataGridRow)datagrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);            if (row == null)            {                datagrid.UpdateLayout();                row = (DataGridRow)datagrid.ItemContainerGenerator.ContainerFromIndex(rowIndex);                row.IsSelected = true;            }            return row;        }

　　然后，添加一个窗体的KeyDown事件：

　　

private void UserControl_KeyDown(object sender, KeyEventArgs e)        {            dgvDeal.Focus();            if (e.Key==Key.NumPad0)            {                if (dgvDeal.SelectedIndex == dgvDeal.Items.Count-1)                {                    dgvDeal.SelectedIndex = 0;                 }                else                {                    dgvDeal.SelectedIndex = dgvDeal.SelectedIndex + 1;                 }            }            else if (e.Key == Key.NumPad1)            {                if (dgvDeal.SelectedIndex == 0)                {                    dgvDeal.SelectedIndex = dgvDeal.Items.Count-1;                 }                else                {                    dgvDeal.SelectedIndex = dgvDeal.SelectedIndex - 1;                 }            }                          DataGridRow resRow = GetDataGridRow(dgvDeal, dgvDeal.SelectedIndex);            resRow.IsSelected = true;            SetSelectedItemFirstRow(dgvDeal, dgvDeal.SelectedItem);                     }

OK!