Solved

Passing class derived from ArrayList

Posted on 2004-10-20
2
224 Views
Last Modified: 2010-05-18
my class "List", is derived from "ArrayList".

I have a function, "foo" that accepts an "ArrayList" as a parameter.


foo(ref ArrayList al)
{
...
}


I want to pass an object of type "List" to foo:


foo(ref List )


but when i cast it, it says it needs to be an lvalue, because its a ref.


What should i be doing?

TIA.
0
Comment
Question by:dave_p_r_b
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 1

Accepted Solution

by:
gav_jackson earned 125 total points
ID: 12356253
you just pass the list object directly into foo (it will be a reference type anyway as it is an arraylist)

foo(List myList)
{
  //myList does not need to be cast as its already a "List" object
}


or am i totally missing the point?
0
 

Author Comment

by:dave_p_r_b
ID: 12356286
No, youve hit the point spot on.

Thanks for your help!

For anyone else, I found an article on msdn that explains  "Passing Reference types by value" .

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/csref/html/vclrfPassingMethodParameters.asp
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Article by: Ivo
C# And Nullable Types Since 2.0 C# has Nullable(T) Generic Structure. The idea behind is to allow value type objects to have null values just like reference types have. This concerns scenarios where not all data sources have values (like a databa…
Performance in games development is paramount: every microsecond counts to be able to do everything in less than 33ms (aiming at 16ms). C# foreach statement is one of the worst performance killers, and here I explain why.
Are you ready to implement Active Directory best practices without reading 300+ pages? You're in luck. In this webinar hosted by Skyport Systems, you gain insight into Microsoft's latest comprehensive guide, with tips on the best and easiest way…
This video shows how to use Hyena, from SystemTools Software, to update 100 user accounts from an external text file. View in 1080p for best video quality.

751 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question