initial commit

Gallery.Share/Services/IDataStore.cs

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+using System;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Gallery.Services
+{
+    public interface IDataStore<T>
+    {
+        Task<bool> AddItemAsync(T item);
+        Task<bool> UpdateItemAsync(T item);
+        Task<bool> DeleteItemAsync(string id);
+        Task<T> GetItemAsync(string id);
+        Task<IEnumerable<T>> GetItemsAsync(bool forceRefresh = false);
+    }
+}

Gallery.Share/Services/MockDataStore.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Gallery.Models;
+
+namespace Gallery.Services
+{
+    public class MockDataStore : IDataStore<Item>
+    {
+        readonly List<Item> items;
+
+        public MockDataStore()
+        {
+            items = new List<Item>()
+            {
+                new Item { Id = Guid.NewGuid().ToString(), Text = "First item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Second item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Third item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Fourth item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Fifth item", Description="This is an item description." },
+                new Item { Id = Guid.NewGuid().ToString(), Text = "Sixth item", Description="This is an item description." }
+            };
+        }
+
+        public async Task<bool> AddItemAsync(Item item)
+        {
+            items.Add(item);
+
+            return await Task.FromResult(true);
+        }
+
+        public async Task<bool> UpdateItemAsync(Item item)
+        {
+            var oldItem = items.Where((Item arg) => arg.Id == item.Id).FirstOrDefault();
+            items.Remove(oldItem);
+            items.Add(item);
+
+            return await Task.FromResult(true);
+        }
+
+        public async Task<bool> DeleteItemAsync(string id)
+        {
+            var oldItem = items.Where((Item arg) => arg.Id == id).FirstOrDefault();
+            items.Remove(oldItem);
+
+            return await Task.FromResult(true);
+        }
+
+        public async Task<Item> GetItemAsync(string id)
+        {
+            return await Task.FromResult(items.FirstOrDefault(s => s.Id == id));
+        }
+
+        public async Task<IEnumerable<Item>> GetItemsAsync(bool forceRefresh = false)
+        {
+            return await Task.FromResult(items);
+        }
+    }
+}