MemoryCache Extension

The MemoryCache class does not have a "Clear()" method.
Here is  an extension that does the job

// Extend MemoryCache functionality
public static class MemoryCacheExtensions
{
 // Clear the cache
 public static void Clear(this MemoryCache cache)
 {
  List<string> cacheKeys = cache.Select(kvp => kvp.Key).ToList();
  foreach (string cacheKey in cacheKeys)
  {
   cache.Remove(cacheKey);
  }
 }
}