public MainWindowViewModel()
        {
            //            OneViewModels = new ObservableCollection<OneViewModel>
            //            {
            //                new OneViewModel(),
            //                new OneViewModel(),
            //                new OneViewModel(),
            //                new OneViewModel()
            //            };

            OneViewModel   = new OneViewModel();
            TwoViewModel   = new TwoViewModel();
            ThreeViewModel = new ThreeViewModel();
        }
 public IActionResult Post([FromBody] ThreeViewModel model)
 {
     try
     {
         // 모델 유효성 검사
         if (!ModelState.IsValid)
         {
             return(BadRequest(ModelState)); // 400 에러 출력
         }
         var m = _repository.Add(model);
         return(CreatedAtAction("Get", new { id = m.Id }, m)); // 201
     }
     catch
     {
     }
     return(BadRequest());
 }