Question

我正在处理一个数据网格，它允许用户选择多行。但是当用户点击行标题时，选择会丢失。

如果已经选择了行，如何在右键单击时禁用行选择。

我试图通过行为

来做到这一点

public class DataGridRowBehavior
{

    public static readonly DependencyProperty DisableSelectionOnRightClickProperty = DependencyProperty.RegisterAttached(
                "DisableSelectionOnRightClick",
                typeof(bool),
                typeof(DataGridRowBehavior),
                new UIPropertyMetadata(false, OnDisableSelectionOnRightClick));


    public static bool GetDisableSelectionOnRightClick(DependencyObject dgRow)
    {
        return (bool)dgRow.GetValue(DisableSelectionOnRightClickProperty);
    }

    public static void SetDisableSelectionOnRightClick(DependencyObject dgRow, bool value)
    {
        dgRow.SetValue(DisableSelectionOnRightClickProperty, value);
    }

    public static void SetListViewFocus(DependencyObject d, bool use)
    {
        d.SetValue(DisableSelectionOnRightClickProperty, use);
    }

    public static void OnDisableSelectionOnRightClick(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        DataGridRowHeader header = d as DataGridRowHeader;
        header.MouseRightButtonUp += header_MouseRightButtonUp;
    }

    static void header_MouseRightButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
    {
        var header = sender as DataGridRowHeader;

        if (header.IsRowSelected)
        {
            if (header.ContextMenu != null)
            {
                header.ContextMenu.IsOpen = true;
            }

            e.Handled = true;
        }
    }
}

但由于右键单击的其他功能也被破坏，因此无法正常工作。例如上下文菜单。上下文菜单未启用其应用程序命令。

有没有其他方法可以禁用选择，或者如果我点击任何选定的行，让选择保持不变？

Answer 1

您有两种选择：

创建自定义DataGrid或DataGridRow并创建SelectionChanging或Selection个事件。需要防止选择。这一次，此控件仅包含SelectionChanged和Selected个事件。下次，我想你可以编写代码

如果您不想创建自定义控件，则可以创建Behavior。例如：

public class SuppressButtonClickBehavior : Behavior<Button>
{
    protected override void OnAttached()
    {
        base.OnAttached();
        AssociatedObject.AddHandler(UIElement.PreviewMouseLeftButtonDownEvent, 
                                    new RoutedEventHandler(OnPreviewMouseLeftButtonDown),
                                    true);
    }

    protected override void OnDetaching()
    {
        base.OnDetaching();
        AssociatedObject.RemoveHandler(UIElement.PreviewMouseLeftButtonDownEvent,
                                       new RoutedEventHandler(OnPreviewMouseLeftButtonDown));
    }

    private void OnPreviewMouseLeftButtonDown(Object sender, RoutedEventArgs e)
    {
        e.Handled = true;
        if (AssociatedObject.Command != null)
        {
            AssociatedObject.Command.Execute(AssociatedObject.CommandParameter);
        }
    }
}

如果您愿意，可以使此代码更灵活。但您必须明白，您只能将e.Handled设置为true以阻止选择。

如果已选择行，则在wpf datagrid中右键单击禁用行选择

1 个答案: