operator(+) overloading in c#

[enahar]

Dear Sir/Madam,

I have 2 lists as following:

ApproverListBE appList1;

ApproverListBE appList2 ;

I want to add the above 2 lists.How do I override the + operator.



Kind Regards,

 

[Joshua Flanagan]

It depends on how you implemented ApproverListBE.
For this example, I assume ApproverListBE derives from ArrayList:

public class ApproverListBE : System.Collections.ArrayList
{
public static ApproverListBE operator+(ApproverListBE list1,
ApproverListBE list2)
{
ApproverListBE combinedList = new ApproverListBE();
combinedList.AddRange(list1);
combinedList.AddRange(list2);
return combinedList;
}
}

You could then do something like:

ApproverListBE x = new ApproverListBE();
ApproverListBE y = new ApproverListBE();
x.Add(1);
x.Add(3);
y.Add(10);
y.Add(12);
y.Add(14);
ApproverListBE z = x + y;
// z now contains 1,3,10,12,14


Of course, you have to change the implementation of your + overload if
you didn't derive from ArrayList (because you probably won't have the
AddRange method). If you implement ICollection, you should be able to
implement the functionality using the CopyTo() method.
Hope that helps get you started.

Joshua Flanagan
http://flimflan.com/blog