Re: Collection/list problem
- From: Lev Blaivas <Lev.Blaivas@xxxxxxxxx>
- Date: Thu, 24 Jul 2008 07:05:08 -0700 (PDT)
On Jul 24, 11:54 am, "Clive Lumb"
<clumb2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Yay! it works!
I would recommend reading once the language specification to clear out the
basics...
Unfortunately I have the French version which is dire, for example it says
that objects in a collection *should* not be of the same type (instead of
*need* not).
"Patrice" <http://www.chez.com/scribe/> a écrit dans le message de news:
7A8AF0C2-88AC-4B3D-9FBC-24835CAF4...@xxxxxxxxxxxxxxxx
You need to add MyClass=New MyThing inside the loop.
Here you always adding the same object to the collection. Even once the
object is added to the collection you can change the object properties
(basically an object is a pointer actual data).
I would recommend reading once the language specification to clear out the
basics...
--
Patrice
"Clive Lumb" <clumb2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx> a écrit dans le
message de groupe de discussion :
488839a0$0$21312$426a7...@xxxxxxxxxxxxxxx
Hi,
I'm having a problem while adding objects to a collection. (VB.net 2005)
I am reading data in from a file to a temporary variable (eg MyClass) and
then adding it to a collection.
When I then enumerate the collection, all the entries are equal to the
last
one added.
The same thing happens with lists and with a generic list(of type).
Obviously the collection or list is storing a reference to the variable,
rather than the values - hence all the items refer to the same variable.
I am probably missing something really basic - please be patient :-)
Many TIA
example:
Public Class MyThing
name as String
Value as integer
end class
Dim MyClass as New MyThing
Dim MyCollection as New Collection
'open file
'do
' read in name, value
MyClass.name=NameFromFile
MyClass.value=ValueFromFile
MyCollection.Add(MyClass)
'loop to end of file
'close file
Here is a great article about reference and value types;
http://www.ondotnet.com/lpt/a/2789
explains in detail the difference between value and reference types
.
- References:
- Collection/list problem
- From: Clive Lumb
- Re: Collection/list problem
- From: Patrice
- Re: Collection/list problem
- From: Clive Lumb
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