public bool IsNull(object val)
{
if (val == null || val == DBNull.Value)
{
return(true);
}
// WARNING !!!
// == comparison result does not match that of .Equals
//bool BROKEN1 = NullValue != null && val == NullValue && val.GetType() == NullValue.GetType();
//bool BROKEN2 = NullValue != null && NullValue == val && val.GetType() == NullValue.GetType();
bool WORKS1 = NullValue != null && NullValue.Equals(val) && val.GetType() == NullValue.GetType();
//bool WORKS2 = NullValue != null && val.Equals( NullValue ) && val.GetType() == NullValue.GetType();
bool isSameValue = IsValueType && val.Equals(NullValue);
return(WORKS1 || isSameValue);
}
/// <summary>
/// Gets the specified cacheKey async.
/// </summary>
/// <returns>The async.</returns>
/// <param name="cacheKey">Cache key.</param>
/// <typeparam name="T">The 1st type parameter.</typeparam>
public override async Task <CacheValue <T> > BaseGetAsync <T>(string cacheKey)
{
ArgumentCheck.NotNullOrWhiteSpace(cacheKey, nameof(cacheKey));
var result = await _memcachedClient.GetAsync <object>(this.HandleCacheKey(cacheKey));
if (result.Success)
{
OnCacheHit(cacheKey);
return(NullValue.Equals(result.Value)
? CacheValue <T> .Null
: new CacheValue <T>((T)result.Value, true));
}
else
{
OnCacheMiss(cacheKey);
return(CacheValue <T> .NoValue);
}
}
