双击行为

Question

我有一个DataGrid样式模板，我希望添加双击行为。绑定应该是正确的，但我似乎无法得到xaml编译/工作。

添加到IDictionary的所有对象都必须具有Key属性或与其相关的其他类型的密钥。

以下代码有什么问题？

<Style TargetType="{x:Type DataGridRow}">
    <EventSetter Event="MouseDoubleClick" Handler="{Binding Connect}"/>

根据Viktor的评论更新（给出完全相同的错误）：

<Style x:Key="dataGridRowStyle" TargetType="{x:Type DataGridRow}">
    <EventSetter Event="PreviewMouseDoubleClick" Handler="{Binding Connect}"/>

Answer 1

可以使用DataGrid InputBindings来实现目标：

<DataGrid.InputBindings>
   <MouseBinding MouseAction="LeftDoubleClick" Command="{Binding SomeCommand}" />
</DataGrid.InputBindings>

Answer 2

您可以在数据网格行上应用以下行为，并按照实施用法进行操作。

双击行为

    public class DoubleClickBehavior
    {
        #region DoubleClick

        public static DependencyProperty OnDoubleClickProperty = DependencyProperty.RegisterAttached(
            "OnDoubleClick",
            typeof(ICommand),
            typeof(DoubleClickBehavior),
            new UIPropertyMetadata(DoubleClickBehavior.OnDoubleClick));

        public static void SetOnDoubleClick(DependencyObject target, ICommand value)
        {
            target.SetValue(OnDoubleClickProperty, value);
        }

        private static void OnDoubleClick(DependencyObject target, DependencyPropertyChangedEventArgs e)
        {
            var element = target as Control;
            if (element == null)
            {
                throw new InvalidOperationException("This behavior can be attached to a Control item only.");
            }

            if ((e.NewValue != null) && (e.OldValue == null))
            {
                element.MouseDoubleClick += MouseDoubleClick;
            }
            else if ((e.NewValue == null) && (e.OldValue != null))
            {
                element.MouseDoubleClick -= MouseDoubleClick;
            }
        }

        private static void MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            UIElement element = (UIElement)sender;
            ICommand command = (ICommand)element.GetValue(OnDoubleClickProperty);
            command.Execute(null);
        }

        #endregion DoubleClick
    }

用法

        <Style   BasedOn="{StaticResource {x:Type DataGridRow}}"
               TargetType="{x:Type DataGridRow}">
            <Setter Property="Helpers:DoubleClickBehavior.OnDoubleClick" Value="{Binding Path=DataContext.MyCommandInVM, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ViewLayer:MyUserControl}}}" />
        </Style>

Answer 3

不确定你是否要使用MVVM路由，但是我已经使用Attached Command Behavior将双击事件连接到我的viewmodel中的命令（其中“command”是对我的attachCommandBehavior程序集/类）：

<DataGrid.RowStyle>
        <Style TargetType="{x:Type DataGridRow}">
            <Setter Property="command:CommandBehavior.Event" Value="MouseDoubleClick"/>
            <Setter Property="command:CommandBehavior.Command" Value="{Binding SelectItemCmd}"/>
            <Setter Property="command:CommandBehavior.CommandParameter" Value="{Binding }"/>
        </Style>
</DataGrid.RowStyle>

鼠标双击DataGrid行

3 个答案:

双击行为

用法