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Implementing IList

Posted on 2004-11-08
Medium Priority
Last Modified: 2008-02-01

when looking at the following snippet of code, how is the following possible?

public class CustomerInfoCollection : IList
   private ArrayList m_alCustomerInfo;
   //constructor yada yada yada

   public int Add(object value)
      if (value is CustomerInfo)
         return m_alCustomerInfo.Add(value);
         //do somehting else here

My question is:  the Add function returns an integer.  However, the body returns an ArrayList.  Wouldn't that throw some sort of an Exception?

thanks from a C# newbie....

Question by:brdrok
LVL 14

Expert Comment

ID: 12528159
What do you mean, "the body returns an ArrayList"? The int returned by the add function is the index inside the ArrayList of the newly added element.

Accepted Solution

tinchos earned 200 total points
ID: 12528750
Keep in mind the following.....

The add function as you said, does not return an ArrayList, but the result of the add method called to that Arraylist.

As you said....

         return m_alCustomerInfo.Add(value);

So both are returning an int, and that's why it does not throw any exception

Hope this helps


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