I'm new in C# and what I learned at school it's really poor. Last week I came to the same problem, I didn't know what the ? means after a name type in C#. I could find the answer, then again what does "??" means in a expression, I'm really frustrated.
In this case the star (*) what is telling me about the incoming parameter? (I'm into an unsafe code block)
I'll really thanked if you give me some quick guides about this things in C#.
'*' means that it is a pointer, much liker pointers in C. You will very rarely encounter these in C# code.
* after a type determines a pointer. There's a good chance that you may never even need to use this.
? after a type says that it is nullable. See below:
int? a = null;
int b = null; //Compile error
?? is the null coalescing operator. Basically it will give you the right-hand side value if the left-hand side is null.
object a = null;
object b = new Object();
object c = a ?? b;
// 'c' is 'b' because 'a' was null.
I hope that answers your questions. I couldn't tell if you were asking about all of these or only the *.
that's how you can declare pointer type, you better read Pointer types (C# Programming Guide)
Pointers are In an unsafe context
