: this(foo) syntax in C# constructors?

Question

Every now and then, I bump into syntax that I\'ve seen before, but never used. This is one of those times.

Can someone explain the purpose of \":this\" or \":base\"

Answer 1

It's like this if i'm not mistaken:

public MyClass(SomeArg arg) : this(new SomethingElse(), arg)

will call

public MyClass(SomethingElse arg, SomeArg arg1) : base or this or nothing

and that will go on until you got a base or nothing.

If you have base(....) then that constructor having that will call the base constructor with the parameters (if any) given, which in turn can delegate to its own constructors (same game).

If you have nothing, then the parameter-less constructor of the base-class is called automatically.

After you have used this(....), then the constructor matching the parameters will be used and its body will be executed - additionally to the body of the constructor having used this(....).