public AppConfigurationMapperAttributes Map(string mappedConfigKey)
{
if (string.IsNullOrEmpty(mappedConfigKey)) return null;
if (configMap.ContainsKey(mappedConfigKey)) return configMap[mappedConfigKey];
var configValue = new AppConfigurationMapperAttributes(mappedConfigKey);
configMap.Add(mappedConfigKey, configValue);
return configValue;
}