c# - 无法转换 viewModel 和 ObservableCollection

Question

在我接下来的第二行中，我发现了一个转换错误参数:

UserStackVM _listeStack = JsonWorker.ReadData();
ListeStacks = new ObservableCollection<UserStackVM>(_listeStack); // here

我的错误是:

cannot convert from 'MyStack.ViewModels.UserStackVM' to 'System.Collections.Generic.List'

UserStackVM 是一个 ViewModel:

#region Properties
        private string name;
        ...
        private string[] path;
        ...
        #endregion

JsonWorker 是一个使用 Json.NET 的静态类 (http://www.newtonsoft.com/json):

#region Properties
        private static string _json;
        private static UserStackVM _userStack;
        #endregion     

        #region Methods

        /// <summary>
        /// Open the json config file. Create it if he doesn't exist.
        /// </summary>
        private static void OpenFile()
        {
            using (var stream = new FileStream(@"config.json", FileMode.OpenOrCreate))
            {
                using (var reader = new StreamReader(stream))
                {
                    _json = reader.ReadToEnd();
                }
            }
        }

        /// <summary>
        /// Read the json config file and return all data.
        /// </summary>
        /// <returns></returns>
        public static UserStackVM ReadData()
        {
            OpenFile();
            _userStack = JsonConvert.DeserializeObject<UserStackVM>(_json);
            return _userStack;
        }    
        #endregion

提前，感谢您的帮助。

Answer 1

'MyStack.ViewModels.UserStackVM' to 'System.Collections.Generic.List'

那个ObservableCollection(T) Constructor期望一个 List<T> (实例列表)；您只提供一个实例。改成

UserStackVM _listeStack = JsonWorker.ReadData();
ListeStacks = new ObservableCollection<UserStackVM>(); 

ListeStacks.Add( _listeStack );

或

ListeStacks = new ObservableCollection<UserStackVM>
                                       ( new List<UserStackVM> () { listeStack } );