title: How to get expiry date for cached item?
body: <p>I store an object in MemoryCache:</p>
  
  <pre><code>void foo()
  {
    ObjectCache cache = MemoryCache.Default;
    SomeClass obj = cache["CACHE_KEY"] as SomeClass;
    if (null == obj )
    {
       obj = new SomeClass(); ....
       CacheItemPolicy policy = new CacheItemPolicy();
       //update
       policy.AbsoluteExpiration = DateTime.Now+TimeSpan.FromMinutes(1);
       cache.Set("CACHE_KEY", obj, policy);
    }
    else
    {
       //get expiry date 
    }
    .....
  }
  </code></pre>
  
  <p>Is it possible to get expiration date somehow if cache contains the object ?</p>