.NET 4.0 New Feature - System.Runtime.Caching

namespace CacheItemPolicyDemo { class Program { static void Main(string[] args) { ContentProvider textFile = new ContentProvider(); Stopwatch sw = new Stopwatch(); while (true) { sw.Reset(); sw.Start(); Console.WriteLine(DateTime.Now.ToString()); Console.WriteLine(textFile.Content); sw.Stop(); Console.WriteLine(“Elapsed Time: {0} ms”, sw.ElapsedMilliseconds); Console.WriteLine(new string(’=’, 50)); Console.ReadLine(); } } }

public class ContentProvider
{
	public String Content
	{
		get
		{
			const string CACHE_KEY = "Content";
			string content = m_Cache[CACHE_KEY] as string;
			if (content == null)
			{
				CacheItemPolicy policy = new CacheItemPolicy();
				policy.AbsoluteExpiration = DateTime.Now.AddMilliseconds(1500);
				//policy.SlidingExpiration = TimeSpan.FromMilliseconds(1500);

				//policy.UpdateCallback = new CacheEntryUpdateCallback((args) => 
				//{
				//	Console.WriteLine("MyCachedItemUpdatedCallback...");
				//	Console.WriteLine(string.Format("Remove {0}...Because {1}",args.Key,args.RemovedReason.ToString()));
				//	Console.WriteLine(new string('=', 50));
				//});

                //policy.RemovedCallback = new CacheEntryRemovedCallback((args) => 
                //{
                //    Console.WriteLine("CacheEntryRemovedCallback...");
                //    Console.WriteLine(string.Format("Remove {0}...Because {1}", args.CacheItem.Key, args.RemovedReason.ToString()));
                //    Console.WriteLine(new string('=', 50));
                //});

				content = Guid.NewGuid().ToString();
				Thread.Sleep(1000);
				m_Cache.Set(CACHE_KEY, content, policy);
			}
			return content;
		}
	}


	private ObjectCache _cache;
	private ObjectCache m_Cache
	{
		get
		{
			if (_cache == null)
				_cache = MemoryCache.Default;
			return _cache;
		}
	}
}

}

• CSharp