在MultiBinding命令参数中包含绑定对象

我试图使用<MultiBinding>将两个参数传递给ViewModel的命令，但遇到问题让XAML解析器接受我的尝试。在MultiBinding命令参数中包含绑定对象

请考虑以下列表视图，该视图包含在我的UserControl中，它绑定到一组Ticket对象。

<ListView x:Name="lvTicketSummaries" 
        ItemsSource="{Binding TicketSummaries}" 
        ItemContainerStyle="{DynamicResource ResourceKey=ListViewItem}" 
        IsSynchronizedWithCurrentItem="True">

各自的风格ListViewItem

<Style x:Key="ListViewItem" TargetType="{x:Type ListViewItem}"> 
    <Setter Property="ContextMenu" Value="{DynamicResource ResourceKey=cmListViewItem}"/> 
    <!-- A load of irrelevant stuff -> 
</Style>

和引用ContextMenu项目在我的查询的源坐镇;

<!-- ContextMenu DataContext bound to UserControls view model so it can access 'Agents' ObservableCollection -->  
<ContextMenu x:Key="cmListViewItem" DataContext="{Binding RelativeSource={RelativeSource AncestorType={x:Type UserControl}}, Path=DataContext}"> 
    <MenuItem Header="Send as Notification" ItemsSource="{Binding Path=Agents}"> 
     <MenuItem.ItemContainerStyle> 
      <Style TargetType="{x:Type MenuItem}"> 
       <!-- Display the name of the agent (this works) --> 
       <Setter Property="Header" Value="{Binding Path=Name}"/> 
       <!-- Set the command to that of one on usercontrols viewmodel (this works) --> 
       <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}}, Path=DataContext.SendTicketNotification}" /> 
       <Setter Property="CommandParameter"> 
        <Setter.Value> 
         <MultiBinding Converter="{StaticResource ResourceKey=TicketNotificationParameterConverter}"> 
          <MultiBinding.Bindings> 
           <!-- This SHOULD be the Agent object I clicked on to trigger the Command. This does NOT work, results in either exception or 'UnsetValue' --> 
           <Binding Source="{Binding}" /> 
           <!-- Also pass in the Ticket item that was clicked on to open the context menu, this works fine --> 
           <Binding RelativeSource="{RelativeSource AncestorType={x:Type ListView}}" Path="SelectedItem" /> 
          </MultiBinding.Bindings> 
         </MultiBinding> 
        </Setter.Value> 
       </Setter> 
      </Style> 
     </MenuItem.ItemContainerStyle> 
    </MenuItem> 
</ContextMenu>

所以这里是我试图做的;

上下文菜单中有一个单一的项目“发送票据为通知”的选择时，列出了所有可用Agents可以接收所述通知。这工作。

当我点击这些代理选一个，我想上下文菜单项，同时发送的ticket项目被点击从listview，要显示快捷菜单（这工作），我从选择的Agent项目上下文菜单。我虽然已经在上下文菜单中的实际的建立似乎有些什么复杂，我与MultiBinding

<MultiBinding Converter="{StaticResource ResourceKey=TicketNotificationParameterConverter}"> 
         <MultiBinding.Bindings> 
          <!-- This works, it sends the Ticket object to the Converter --> 
          <Binding RelativeSource="{RelativeSource AncestorType={x:Type ListView}}" Path="SelectedItem" /> 
          <!-- This caused an exception saying that I can only set 'Path' property on DependencyProperty types --> 
          <Binding Path="{Binding}" /> 
         </MultiBinding.Bindings> 
        </MultiBinding>

现在半实现了这一点。 MultiBinding参数之一的实际规格应该是绑定到点击的ContextMenu.MenuItem的实际项目，这似乎是一个非常简单的命令。上下文菜单正确地列出了所有Agent，所以我认为只需要简单地要求将当前对象作为命令参数发送。我也尝试过;

<Binding RelativeSource={RelativeSource AncestorType={x:Type MenuItem}} Path="SelectedItem" />

以及

<Binding RelativeSource={RelativeSource AncestorType={x:Type ContextMenu}} Path="SelectedItem" />

但所有的被发送到参数转换为UnsetValue

谢谢你的时间，你可能有任何建议。

来源

2011-04-09 user407356

此行是奇数：

<Binding Path="{Binding}" />

是当前的DataContext这就够了，因为这将查找当前的DataContext这实际上是不是字符串毕竟东西路径的字符串？非常有意义。

你是不是要这样做，而是绑定到DataContext？

<Binding />

来源

2011-05-03 22:37:12

在MultiBinding命令参数中包含绑定对象

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