c# - Auto-implemented properties with non null guard clause? -

i agree mark seeman's notion automatic properties evil break encapsulation. concise syntax, readability , convenience bring.

i quote:

public string name { get; set; } 

the problem code snippet isn’t contains ceremony. problem breaks encapsulation. in fact

“[…] getters , setters not achieve encapsulation or information hiding: language-legitimized way violate them.”

james o. coplien & gertrud bjørnvig. lean architecture. wiley. 2010. p. 134.

most of time, adding non-null guard clause enough property setter , know if there better way of doing 1 of below. better, mean in more concise/less repetitive way.

using code contracts:

private string _username; public virtual string username {     { return _username; }     set      {           contract.requires(value != null);         _username = value;      } } 

using vanilla .net:

private string _username; public virtual string username {     { return _username; }     set      {         if (value == null) throw new argumentnullexception("username");         _username = value;      } } 

i'll quote code contracts manual, § 2.3.1:

public int myproperty { get; private set ; }  [contractinvariantmethod] private void objectinvariant ()  {       contract. invariant ( this.myproperty >= 0 );       ... }