Akavache Sample From Akavache Is AKA Awesome Blog

AkaConsumer.cs

public class App : Application
{
		AkaConsumer consumer;

		public App()
		{
			// The root page of your application
			consumer = new AkaConsumer();

			var contentLabel = new Label() { HorizontalTextAlignment = TextAlignment.Center };

			var loadButton = new Button()
			{
				Text = "Load More Data",
				HorizontalOptions = LayoutOptions.CenterAndExpand
			};

			var displayButton = new Button()
			{
				Text = "Display The Data",
				HorizontalOptions = LayoutOptions.CenterAndExpand
			};

			loadButton.Clicked += (s, e) =>
			{
				consumer.LoadData();
			};

			displayButton.Clicked += (s, e) =>
			{
				contentLabel.Text = string.Empty;

				foreach (var item in consumer.allTodos)
				{
					contentLabel.Text = contentLabel.Text + " " + item.ToDoItemId + Environment.NewLine;
				}
			};

			var content = new ContentPage
			{
				Title = "AkaTest",
				Content = new StackLayout
				{
					VerticalOptions = LayoutOptions.Center,
					Children = {
						loadButton,
						displayButton,
						contentLabel
					}
				}
			};

			MainPage = new NavigationPage(content);
		}
}
	
	public class AkaConsumer
	{
		public List<ToDoItem> allTodos = new List<ToDoItem>();
		int overallCounter = 0;

		public void LoadData()
		{
			BlobCache.LocalMachine.GetAndFetchLatest("todoconstant", async () =>
			{				
				return await GetMoreItems();
			}).Subscribe((cacheThenUpdate) =>
			{			
				// Need to check what's already been added
				// Going to keep adding the previous results
				allTodos.AddRange(cacheThenUpdate);
			});
		}

		async Task<List<ToDoItem>> GetMoreItems()
		{
			var returnList = new List<ToDoItem>();
			await Task.Delay(50);

			var counter = 3;

			for (int i = 0; i < counter; i++)
			{
				var newTDI = new ToDoItem() { ToDoItemId = overallCounter++, 
					Description = "Loop Counter: " + i.ToString() };

				returnList.Add(newTDI);
			}

			return returnList;
		}
	}