Form constructor taking parameters by reference

[Nikola Skoric]

I noticed that System.Windows.Forms.Form constructor treats his
parameters as though they are passed by reference even if I omit the
"ref" keyword. Why's (and how does he do) that? Shouldn't objects be
passed by value if I don't explicitly put "ref" in parameter list?

 

[Jon Skeet [C# MVP]]

I noticed that System.Windows.Forms.Form constructor treats his
parameters as though they are passed by reference even if I omit the
"ref" keyword. Why's (and how does he do) that? Shouldn't objects be
passed by value if I don't explicitly put "ref" in parameter list?

I suspect you're slightly confused about pass by reference semantics vs
"pass reference by value" semantics. Don't worry - lots of people often
are, and it's easy to fix

See http://www.pobox.com/~skeet/csharp/parameters.html

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

|I noticed that System.Windows.Forms.Form constructor treats his
| parameters as though they are passed by reference even if I omit the
| "ref" keyword. Why's (and how does he do) that? Shouldn't objects be
| passed by value if I don't explicitly put "ref" in parameter list?

IIRC the form constructor by default takes no parameters.

If you have doubt regarding parameters take a look at Jon Skeet's article at
http://www.pobox.com/~skeet/csharp/parameters.html

 

[Marc Gravell]

Well, System.Windows.Forms.Form only has a parameterless constructor...
did you mean something else? However, this question probably relates to
value/reference *types* rather than value/reference *passing*; if a
reference-type is passed to a (non-ref) parameter, then the *variable*
is passed by value, but the underlying object is still a single
instance with a shared reference. Jon has a good explanation:
http://www.yoda.arachsys.com/csharp/parameters.html

Marc

 

[Marc Gravell]

<laughs> OK: we're in agreement; Mr. Skeet's article gets it;

and Jon: sorry I keep posting arachsys rather than pobox, but the
simple fact is that google always gives me that one first... perhaps
redirect?

Marc

 

[Nikola Skoric]

I suspect you're slightly confused about pass by reference semantics vs
"pass reference by value" semantics. Don't worry - lots of people often
are, and it's easy to fix

See http://www.pobox.com/~skeet/csharp/parameters.html

10 points for Jon. Thanks a bunch, you made my day. Your article now
has another dedicated follower ;-)

 

[Jon Skeet [C# MVP]]

<laughs> OK: we're in agreement; Mr. Skeet's article gets it;

LOL

and Jon: sorry I keep posting arachsys rather than pobox, but the
simple fact is that google always gives me that one first... perhaps
redirect?

pobox.com is a redirector service - if I ever change from
yoda.arachsys.com to somewhere else, the pobox addresses should still
work. It's unlikely to happen any time in the near future though...

 

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,


|
| pobox.com is a redirector service - if I ever change from
| yoda.arachsys.com to somewhere else, the pobox addresses should still
| work. It's unlikely to happen any time in the near future though...
|

Sorry Jon, you are not allowed to change the domain, not in this lifetime
, too many posts linked to it, if you do move it the C# universe will
collapse