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New Message on BDOTNET
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From: rags_rao
Message 4 in Discussion
You will c no diff b/w byval,byref on refrence types (again! string is an exception).
but in situations like the one given shown below u will see a diff.
byval: passes a copy of refernce
byref: a magaged pointer (same as ¶ms in c++) is passed
public class MyObject
{
public int x;
public static void Main()
{
MyObject obj1 = new MyObject(),obj2 = new MyObject(),obj3=obj1;
//2 objects. obj1 points to 1st one. obj2,3 point to 2nd one
obj1.x =
obj2.x = 10;
ModifyByRef(ref obj1);
ModifyByVal(obj2);
if(obj1!=null) System.Console.WriteLine(obj1.x);
else System.Console.WriteLine("obj1 is null");//null because a managed pointer
to same reference was passed
if(obj2!=null) System.Console.WriteLine(obj2.x);//no problem copy of refrence
was passed
else System.Console.WriteLine("obj2 is null");
if(obj3!=null) System.Console.WriteLine(obj3.x);//but the underlying object is
still modified
else System.Console.WriteLine("obj3 is null");
}
public static void ModifyByRef(ref MyObject obj)
{
obj.x = 20;
obj = null;
}
public static void ModifyByVal(MyObject obj)
{
obj.x = 20;
obj = null;
}
}
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