ControlTemplate中的边框导致使用DataGrid的奇怪选择行为

调用内部方法似乎有点危险。如果实现细节发生变化怎么办?以前的版本有很多变化。

我认为在您的行中简单地添加这样的事件处理程序可能更为谨慎:

protected void DataGridRow_MouseDown(object sender, MouseButtonEventArgs e)
{
    // GetVisualChild<T> helper method, simple to implement
    DataGridCellsPresenter presenter = GetVisualChild<DataGridCellsPresenter>(rowContainer);

    // try to get the first cell in a row
    DataGridCell cell = (DataGridCell)presenter.ItemContainerGenerator.ContainerFromIndex(0);
    if (cell != null)
    {
        RoutedEventArgs newEventArgs = new RoutedEventArgs(MouseLeftButtonDownEvent);
        //if the DataGridSelectionUnit is set to FullRow this will have the desired effect
        cell.RaiseEvent(newEventArgs);
    }
}

这将具有与单击单元格本身相同的效果,并且只使用DataGrid元素的公共成员。

工具箱DataGridRow没有定义的OnMouseDown重写或类似方法。整行的选择通过以下方法处理:

internal void HandleSelectionForCellInput(DataGridCell cell, bool startDragging, bool allowsExtendSelect, bool allowsMinimalSelect)
{
    DataGridSelectionUnit selectionUnit = SelectionUnit;

    // If the mode is None, then no selection will occur
    if (selectionUnit == DataGridSelectionUnit.FullRow)
    {
        // In FullRow mode, items are selected
        MakeFullRowSelection(cell.RowDataItem, allowsExtendSelect, allowsMinimalSelect);
    }
    else
    {
        // In the other modes, cells can be individually selected
        MakeCellSelection(new DataGridCellInfo(cell), allowsExtendSelect, allowsMinimalSelect);
    }

    if (startDragging)
    {
        BeginDragging();
    }
}

当输入发生在 细胞 . makefullRowSelection方法只选择一行中的所有单元格,而不是行本身。

因此,当您单击DataGridRow(而不是DataGridCell)时,不会发生鼠标向下或选择处理。要完成您想要的,您应该在行的鼠标悬停事件中添加某种鼠标悬停处理程序,您可以在其中设置IsSelected属性。当然,请注意,您应该分别为行中的每个单元格指定Selected属性,因为row.isselected并不意味着或设置该属性。

感谢您的回答,我得到了一个一般性的想法,但是将isselected设置为true并没有按我预期的方式工作,当它击中时,会导致行被选中,但不会取消另一行的选中(在这种情况下,它应该是这样)。我可以通过在我的处理程序中调用handleselectionforcellinput来解决这个问题。然后我将从下面创建的lambda与网格和单元格一起调用,效果非常好。

public static Action<DataGrid, DataGridCell, bool> CreateSelectRowMethod(bool allowExtendSelect, bool allowMinimalSelect)
{
var selectCellMethod = typeof(DataGrid).GetMethod("HandleSelectionForCellInput", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);

ParameterExpression dataGrid = Expression.Parameter(typeof(DataGrid), "dataGrid");
ParameterExpression paramCell = Expression.Parameter(typeof(DataGridCell), "cell");
ParameterExpression paramStartDragging = Expression.Parameter(typeof(bool), "startDragging");
var paramAllowsExtendSelect = Expression.Constant(allowExtendSelect, typeof(bool));
var paramAllowsMinimalSelect = Expression.Constant(allowMinimalSelect, typeof(bool));

var call = Expression.Call(dataGrid, selectCellMethod, paramCell, paramStartDragging, paramAllowsExtendSelect, paramAllowsMinimalSelect);

return (Action<DataGrid, DataGridCell, bool>)Expression.Lambda(call, dataGrid, paramCell, paramStartDragging).Compile();
}