/// <summary>
/// Retrieves an item based on a search key
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="key"></param>
/// <returns></returns>
public IEnumerable <T> QueryItem <T>(string key, string value, QueryOperationConfig config) where T : class
{
return(DbContext.FromQuery <T>(config));
}