Caching thing for Ian

gistfile1.cs

public class ThingThatGetsMeData : IThingThatGetsMeData
{
  public Data GetTheData()
  {
    // database loading logic
  }
}

public class CachingThingThatGetsMeData : IThingThatGetsMeData
{
  IThingThatGetsMeData _inner;
  public CachingThingThatGetsMeData(IThingThatGetsMeData realOne)
  {
    _inner = realOne;
  }

  public Data GetTheData()
  {
     if(_cache.ContainsKey[dataKey])
     {
       return _cache.ContainsKey[dataKey];
     }

     var data = _inner.GetTheData();
     _cache[dataKey] = data;
     return data;
  }
}

Then instead of injecting ThingThatGetsMeData just inject CachingThingThatGetsMeData and after the first hit, everything is cool.
Just use a MemoryCache internally, as either a static or set the caching thing as a container managed singleton.