添加项目文件。

XXCpzs.MobileAppService/Models/IItemRepository.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+
+namespace XXCpzs.Models
+{
+    public interface IItemRepository
+    {
+        void Add(Item item);
+        void Update(Item item);
+        Item Remove(string key);
+        Item Get(string id);
+        IEnumerable<Item> GetAll();
+    }
+}

XXCpzs.MobileAppService/Models/Item.cs

@@ -0,0 +1,16 @@
+using System;
+using System.ComponentModel.DataAnnotations;
+
+namespace XXCpzs.Models
+{
+    public class Item
+    {
+        public string Id { get; set; }
+
+        [Required]
+        public string Text { get; set; }
+
+        [Required]
+        public string Description { get; set; }
+    }
+}

XXCpzs.MobileAppService/Models/ItemRepository.cs

@@ -0,0 +1,47 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Concurrent;
+
+namespace XXCpzs.Models
+{
+    public class ItemRepository : IItemRepository
+    {
+        private static ConcurrentDictionary<string, Item> items =
+            new ConcurrentDictionary<string, Item>();
+
+        public ItemRepository()
+        {
+            Add(new Item { Id = Guid.NewGuid().ToString(), Text = "Item 1", Description = "This is an item description." });
+            Add(new Item { Id = Guid.NewGuid().ToString(), Text = "Item 2", Description = "This is an item description." });
+            Add(new Item { Id = Guid.NewGuid().ToString(), Text = "Item 3", Description = "This is an item description." });
+        }
+
+        public IEnumerable<Item> GetAll()
+        {
+            return items.Values;
+        }
+
+        public void Add(Item item)
+        {
+            item.Id = Guid.NewGuid().ToString();
+            items[item.Id] = item;
+        }
+
+        public Item Get(string id)
+        {
+            items.TryGetValue(id, out Item item);
+            return item;
+        }
+
+        public Item Remove(string id)
+        {
+            items.TryRemove(id, out Item item);
+            return item;
+        }
+
+        public void Update(Item item)
+        {
+            items[item.Id] = item;
+        }
+    }
+}