WPF_View中控件使用单例ViewModel

 public class VMTest:Ad.Core.ViewModel.ViewModel
    {
       public static readonly VMTest instance = new VMTest();
       private VMTest()
       {
           MyProperty = new ObservableCollection<BrowseHistory> ();
          
       }
       
        public static VMTest GetInstance()
        {
            return instance;
        }

        /// <summary>
        /// 
        /// </summary>
        public ObservableCollection<BrowseHistory> MyProperty
        {
            get { return (ObservableCollection<BrowseHistory>)this.Property["MyProperty"]; }
            set { this.Property["MyProperty"] = value; }
        }
        public void Add(string id, string fileName)
        {
            BrowseHistory model = new BrowseHistory();
            model.Id = id;
            model.FileName = fileName;
            MyProperty.Add(model);
         }
    }