添加项目文件。

XXCpzs/ViewModels/ItemDetailViewModel.cs

@@ -0,0 +1,16 @@
+using System;
+
+using XXCpzs.Models;
+
+namespace XXCpzs.ViewModels
+{
+    public class ItemDetailViewModel : BaseViewModel
+    {
+        public Item Item { get; set; }
+        public ItemDetailViewModel(Item item = null)
+        {
+            Title = item?.Text;
+            Item = item;
+        }
+    }
+}