問(wèn)題描述

我有一個(gè) MenuItem，其中包含一組項(xiàng)目.它看起來(lái)像文件 -> 打開(kāi)菜單項(xiàng).

I have a MenuItem, which has a collection of items in it. It looks like the File -> Open Menuitem.

所以:

• 文件
  • 打開(kāi)
    • 從數(shù)據(jù)庫(kù)打開(kāi)
      • 文件 1
      • 文件 2
      • 文件 3

      XAML 代碼:

      <Menu>
      <MenuItem Header="File">
          <MenuItem Header="Open">
              <MenuItem Header="From Database" ItemsSource="{Binding OCFragebogen}"/>
          </MenuItem>
      </MenuItem>
      </Menu>
      

      我想在單擊特定項(xiàng)目時(shí)調(diào)用命令.示例:用戶單擊文件 1，應(yīng)調(diào)用命令，其中文件 1"是命令參數(shù).

      I want to call a Command, when a specific item has been clicked. Example: User clicks on File 1, a command should be called where the "File 1" is the Command Parameter.

      ViewModel 包含我想在 MenuItem集合"中顯示的項(xiàng)目

      ViewModel contains the Items, which I want to display in the MenuItem "collection"

      private ObservableCollection<string> _OCFragebogen;
      public ObservableCollection<string> OCFragebogen
      {
          get
          {
              if (_OCFragebogen == null)
                  _OCFragebogen = new ObservableCollection<string>();
              return _OCFragebogen;
          }
          set
          {
              _OCFragebogen = value;
              RaisePropertyChanged(() => OCFragebogen);
          }
      }
      

      明確地說(shuō):當(dāng)用戶點(diǎn)擊 MenuItem 中的一個(gè)項(xiàng)目(來(lái)自 ItemsSource)時(shí)，應(yīng)該調(diào)用一個(gè)命令，我想對(duì)點(diǎn)擊的項(xiàng)目執(zhí)行某些操作.

      To make it clear: When the user clicks on an item (from the ItemsSource) in the MenuItem, a Command should be called where I want to do something with the clicked Item.

      我必須在哪里使用命令來(lái)調(diào)用 ViewModel 中的方法 (RelayCommand)?我希望在單擊 ItemsSource 中的一個(gè)項(xiàng)目時(shí)使用它 + 我想將單擊的項(xiàng)目傳遞給該方法.

      Where do I have to use the command to call a method (RelayCommand) in my ViewModel? I want it to be used when an Item from the ItemsSource has been clicked + I want to pass the clicked item to the method.

      推薦答案

      這應(yīng)該對(duì)你有用

      <MenuItem Header="From Database" 
                ItemsSource="{Binding YourItemSource}">
          <MenuItem.ItemContainerStyle>
              <Style TargetType="MenuItem">
                  <Setter Property="Command" Value="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType=MenuItem}, Path=DataContext.YourCommandName}"></Setter>
                  <Setter Property="CommandParameter" Value="{Binding}"></Setter>
               </Style>
           </MenuItem.ItemContainerStyle>
      </MenuItem>
      

      這篇關(guān)于將項(xiàng)目綁定到 MenuItem ->使用命令的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！

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