C＃Xamarin-如何从“ ObservableCollection <T>”访问对象属性？

如何解决C＃Xamarin-如何从“ ObservableCollection <T>”访问对象属性？

我具有创建ObservableCollection<MenuBody>来创建Xamarin.Forms用户菜单的功能。

    private ObservableCollection<MenuBody> _userList;
    public ObservableCollection<MenuBody> UserList
    {
        set { SetProperty(ref _userList,value); }
        get { return _userList; }
    }

    private void LoadUserMenu()
    {
        UserList = new ObservableCollection<MenuBody>
        {
            new MenuBody
            {   
                Id = 1,Text = "Principal",Icon = IconFont.FileSignature,},new MenuBody
            {
                Id = 2,Text = "Configurações",Icon = IconFont.Cog,};
    }

XAML CollectionView绑定属性：

<CollectionView 
    x:Name="MyUserCollectionView"
    BackgroundColor="Transparent" 
    ItemsSource="{Binding UserList}"
    SelectionMode="Single"
    SelectionChangedCommand="{Binding MenuUserTappedCommand}" 
    SelectionChangedCommandParameter="{Binding SelectedItem,Source{x:ReferenceMyUserCollectionView}}"
                 

我用来检测菜单上用户点击的功能。

     private DelegateCommand<object> _menuUserTappedCommand;

     public DelegateCommand<object> MenuUserTappedCommand =>
    _menuUserTappedCommand ?? (_menuUserTappedCommand = new DelegateCommand<object>(ExecuteMenuUserTappedCommand));

async void ExecuteMenuUserTappedCommand(object parameter)
{
    await App.Current.MainPage.displayAlert("Message","Item " + parameter + " clicked","Ok");
}

我正在尝试从此处访问MenuBody Id属性：

我试图写成parameter.Id来引用它，但它没有按预期出现。

有人可以帮我找出我哪里错了吗？

解决方法

要么投下

var item = (MenuBody)parameter;
// then you can use item.Id 

或使用正确的类型代替对象

public DelegateCommand<MenuBody> MenuUserTappedCommand =>
_menuUserTappedCommand ?? (_menuUserTappedCommand = new DelegateCommand<MenuBody>(ExecuteMenuUserTappedCommand));

async void ExecuteMenuUserTappedCommand(MenuBody parameter)
{
    await App.Current.MainPage.DisplayAlert("Message","Item " + parameter.Id + " clicked","Ok");
}