我有一个已经加载了一些数据的DataGrid。我需要将焦点设置在这个表格的第一行。
我将从一个按钮的onClick事件中调用这个方法。
myGrid.Focus()
不能将焦点集中在表格内的行上。
dgGrid.ItemsSource = new List<object>() { new { I = 10, J = 20 }, new { I = 10, J = 20 }, new { I = 10, J = 20 }, new { I = 10, J = 20 }, new { I = 10, J = 20 } };
Dispatcher.Invoke(new Action(delegate()
{
grd.SelectedIndex = 0;
grd.Focus();
}
), System.Windows.Threading.DispatcherPriority.Background);
或者从链接文章中选择最健壮的一个
public static DataGridCell GetCell(DataGrid dataGrid, DataGridRow rowContainer, int column)
{
if (rowContainer != null)
{
DataGridCellsPresenter presenter = FindVisualChild<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<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;
}
public 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();
/* set the SelectedItem property */
object item = dataGrid.Items[rowIndex]; // = Product X
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();
}
}
你需要添加这些静态方法来调用第二个方法,它首先尝试查找(或绘制)行,如果还没有绘制,则设置焦点在该行上。
试试这个:
if (e.Key == Key.Up || e.Key == Key.Down)
{
var uiElement = e.OriginalSource as UIElement;
dgvRoute.Focus(); //Datagrid
uiElement.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
}
mygrid.SelectedItem = mygrid.Items.Count > 0 ? mygrid.Items[0] : null;
myGrid.SelectedIndex = 0;