What is the use of having "ref" in this case

KH Cheong

Hi,

I came across a question which made me confused. What is the use of having "ref" before s.MyFun in this case. I tried to remove it and it still works.

I understand the reason for putting it before a variable that the content can be changed subsequently. What is the use of this one ? the function content will not be changed.

class Sample

   public void MyFun(int i, Single j)

       Console.WriteLine("Welcome to IndiaBIX !");

delegate void del(int i, Single j);

del d; Sample s = new Sample();

d = new del(ref s.MyFun);

d(10, 1.1f);

1 Reply

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Nanhe Siddique11y ago
hi KH

The ref keyword causes an argument to be passed by reference, not by value. The effect of passing by reference is that any change to the parameter in the called method is reflected in the calling method. For example, if the caller passes a local variable expression or an array element access expression, and the called method replaces the object to which the ref parameter refers, then the caller’s local variable or the array element now refer to the new object.

and also read this link with example

http://www.codeproject.com/Articles/550479/Ref-and-Out-The-Inside-Story

i think it may help you