C# Attributes are very popular for ‘decorating’ assembly with some additional data, usually influencing on the application’s behavior or the way data are managed. You probably already used at least some of them – Obsolete, Serializable, Required, Display, MaxLength, RegularExpression, WebMethod are only a few of hundreds available in .Net world. What is more, you can write your own custom attribute and use it like a build-in one. I will write more about this in the next post. Right now, let’s focus o...

Jeśli API, z którego musisz skorzystać dostarcza Ci dane w 'brzydkiej' formie, zmapuj je. Dodaj warstwę abstrakcji i ukryj złe struktury.

It is a common practice to validate function arguments before running actual code. Usually validation looks like that: public void Update(Car entity) { if(entity ==null) throw new ArgumentNullException("entity"); } There is nothing wrong with this code, however we have to repeat this piece of code in every function. Of course we could create some helper class for argument validation and call approperiate validation function before launching...