add Recommendation

src/Shared/HandyControlDemo_Shared/ViewModel/Main/ItemsDisplayViewModel.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+using HandyControlDemo.Data;
+
+namespace HandyControlDemo.ViewModel
+{
+    public class ItemsDisplayViewModel : DemoViewModelBase<AvatarModel>
+    {
+        public ItemsDisplayViewModel(Func<List<AvatarModel>> getDatAction)
+        {
+#if netle40
+            Task.Factory.StartNew(() => DataList = getDatAction?.Invoke());
+#else
+            Task.Run(() => DataList = getDatAction?.Invoke());
+#endif
+        }
+    }
+}