Expression is a value and therefore cannot be the target of an assignment vb.net

Public Structure _cache
    Public loading As Boolean
End Structure


Public Class Server
    Public _cache_List As New List(Of _cache)()
...

For index As Int16 = 0 To _cache_List.Count - 1
_cache_List(index).loading = false '--> error
Next

"Expression is a value and therefore cannot be the target of an assignment "

what was wrong in the code above?
JSW21Asked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Carl TawnSystems and Integration DeveloperCommented:
The problem is that you are making an indirect reference to a Value-type (your structure) which results in it being classed as an expression.
You will have to declare a variable to hold a direct reference to the item and assign through that:


For index As Int16 = 0 To _cache_List.Count - 1
   Dim item As _cache = _cache_list(index)
   item.loading = false
Next

Open in new window

0
JSW21Author Commented:
Hi there
So I change the Structure into Class and it works.
I didnt know using structure will have different from class.

Do you think i am doing the right thing.
0
Carl TawnSystems and Integration DeveloperCommented:
Structures are fundamentally different from classes in that they are value-types rather than reference types. Whether or not you need a struct rather than a class depends largely on its intended use.
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
JSW21Author Commented:
I will need to use class as I need to modify its values.
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
.NET Programming

From novice to tech pro — start learning today.