Question

我在C＃代码中的数据网格上有以下内容：

<DataGrid.InputBindings>  
    <MouseBinding Gesture="LeftDoubleClick" Command="{Binding CmdTransUnitFillerRowDblClick}" />  
</DataGrid.InputBindings>

除了用户首先选择行（单击）然后尝试双击该行之外，它大部分都有效。在这种情况下，CmdTransUnitFillerRowDblClick代码永远不会被触发进行处理。

那么，当行已被选中时，如何在双击时正确触发CmdTransUnitFillerRowDblClick？
因为有人可能会问：

private void ExecutecmdTransUnitFillerRowDblClick(object parameter)  
{
    if (DgTransUnitFillerSelectedItem != null)
        TransUnitFillerDoubleClick(DgTransUnitFillerSelectedItem.CollectionRowId);
}

Answer 1

见my answer to another related question。问题是数据网格在用户选择行（或实际上是单元格）之后不再具有焦点;用户在数据网格中单击的单元格。因此，您必须将焦点更改回datagrid以允许此操作。

变化：

<DataGrid.InputBindings> <MouseBinding Gesture="LeftDoubleClick" Command="{Binding CmdTransUnitFillerRowDblClick}" /> </DataGrid.InputBindings>

要：

<DataGrid.InputBindings> <MouseBinding Gesture="LeftDoubleClick" Command="{Binding CmdTransUnitFillerRowDblClick}" /> <MouseBinding Gesture="LeftClick" Command="{Binding CmdTransUnitFillerRowClick}" /> </DataGrid.InputBindings>

...并添加：

private void ExecutecmdTransUnitFillerRowClick(object parameter) { if (DgTransUnitFillerSelectedItem != null) The_Name_Of_Your_DataGrid.Focus(); }

Answer 2

在现有的InputBinding之上，您可以使用Style将InputBinding附加到每个单元格：

<Style TargetType="DataGridCell">
    <Setter Property="local:MouseCommands.LeftDoubleClick" Value="ApplicationCommands.New" />
</Style>

这需要使用here中的MouseCommands类。

public static class MouseCommands
{
    private static void LeftDoubleClickChanged(DependencyObject sender, DependencyPropertyChangedEventArgs args)
    {
        var control = (Control)sender;

        if (args.NewValue != null && args.NewValue is ICommand)
        {
            var newBinding = new MouseBinding(args.NewValue as ICommand, new MouseGesture(MouseAction.LeftDoubleClick));
            control.InputBindings.Add(newBinding);
        }
        else
        {
            var oldBinding = control.InputBindings.Cast<InputBinding>().First(b => b.Command.Equals(args.OldValue));
            control.InputBindings.Remove(oldBinding);
        }
    }

    public static readonly DependencyProperty LeftDoubleClickProperty =
        DependencyProperty.RegisterAttached("LeftDoubleClick",
            typeof(ICommand),
            typeof(MouseCommands),
            new UIPropertyMetadata(LeftDoubleClickChanged));

    public static void SetLeftDoubleClick(DependencyObject obj, ICommand value)
    {
        obj.SetValue(LeftDoubleClickProperty, value);
    }

    public static ICommand GetLeftDoubleClick(DependencyObject obj)
    {
        return (ICommand)obj.GetValue(LeftDoubleClickProperty);
    }
}

虽然我认为更简洁的方法是在代码隐藏中处理MouseDoubleClick事件，并通过直接调用ViewModel或在命令上调用.Execute（）手动提升命令执行。

双击datagrid时出现问题

2 个答案: