将项目绑定到 MenuItem ->使用命令

问题描述

我有一个 MenuItem，其中包含一组项目.它看起来像文件 -> 打开菜单项.

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

所以:

• 文件
  • 打开
    • 从数据库打开
      • 文件 1
      • 文件 2
      • 文件 3

      XAML 代码:

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

      我想在单击特定项目时调用命令.示例:用户单击文件 1，应调用命令，其中文件 1"是命令参数.

      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"中显示的项目

      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);
          }
      }
      

      明确地说:当用户点击 MenuItem 中的一个项目(来自 ItemsSource)时，应该调用一个命令，我想对点击的项目执行某些操作.

      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.

      我必须在哪里使用命令来调用 ViewModel 中的方法 (RelayCommand)?我希望在单击 ItemsSource 中的一个项目时使用它 + 我想将单击的项目传递给该方法.

      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.

      推荐答案

      这应该对你有用

      <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>