public DictionaryToObjectMappingBuilder <TResult> AddMapping(object sourceKey, Expression <Func <TResult, object> > targetExpression)
 {
     _mappingDictionary.Set(sourceKey, targetExpression);
     return(this);
 }
 public NumberToFlagMappingBuilder <TResult> AddMapping(int digit, Expression <Func <TResult, bool> > targetExpression)
 {
     _mappingDictionary.Set(digit, targetExpression);
     return(this);
 }