ByRef

[Guest]

How do I pass a variable ByRef in C#?

 

[Barry Kelly]

How do I pass a variable ByRef in C#?

ref

as in:

void MyMethod(ref int x)
{
x = 42;
}

-- Barry

 

[Jon Skeet [C# MVP]]

How do I pass a variable ByRef in C#?

Using the "ref" modifier. Note that it's rarely necessary, as reference
type values are already references. (Those references are passed by
value, however.)

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

 

[Guest]

Is a reference type value the same as an object?

 

[Jon Skeet [C# MVP]]

Is a reference type value the same as an object?

I expressed myself badly. When you have a variable whose type is a
reference type, the value of that variable is a reference. It's not the
object itself, it's a reference to the object. Suppose you had:

string x = "some very long string indeed which would be large etc";

then the value of x is just a reference - 4 or 8 bytes depending on
your platform. When you use x as an argument to a method, only 4 (or 8)
bytes are copied - the reference. The object itself is on the heap, and
the new copy of the reference points to the same object as the "old"
reference.

 

[Barry Kelly]

Is a reference type value the same as an object?

Yes, anything declared with the 'class' keyword in C#.

-- Barry