Adding an Object to an ArrayList

[Anchor]

Hi All,

I was hoping someone could help me out. I am new to VB.NET and
I don't know the language too well. I am trying to add an object
instance of a class to an array like in the code snipet below.
I run through the For Each loop 5 times and I place a reference
to the object in an ArrayList. Once I skip out of the loop block
I expect to have 5 different instances of that class in the
ArrayList. However, instead I have 5 instances of the class but
they are all of the last one that was added.


ObjList As ArrayList ' Declared at top of Form Class.
ObjList = New ArrayList ' In an initialize method.

' Code below is in some method in same Form Class.
Dim Info As InfoClass
Dim CrntObj as SomeClass

For Each Info in SomeArray ' 5 Info objects in SomeArray
CrntObj = myMgr.GetSomeCl assObject(Info)
' do some stuff here
ObjList.Add(Crn tObj)
Next sInfo


I know whats happening. I'm storing the reference to the
CrntObj variable in the ArrayList instead of what it references.
That's why I have 5 objects in the ArrayList all pointing to
the last item that was added. But why? I believe this would be
okay in C#. Can someone please help me out and tell me what I
am doing wrong?

Thanks,
Joe

[Rick Rothstein]

Re: Adding an Object to an ArrayList

Almost everybody in this newsgroup is using VB6 or lower. While you may get
a stray answer to VB.NET questions here, you should ask them in newsgroups
devoted exclusively to .NET programming. Look for newsgroups with either the
word "dotnet" or "vsnet" in their name.

For the microsoft news server, try these newsgroups...

microsoft.publi c.dotnet.genera l
microsoft.publi c.dotnet.langua ges.vb
microsoft.publi c.vsnet.general

There are some others, but these should get you started.

Rick - MVP



"Anchor" <jmanzi@gtnetin c.com> wrote in message
news:fb5c52a2.0 404021328.699a2 4ff@posting.goo gle.com...[color=blue]
> Hi All,
>
> I was hoping someone could help me out. I am new to VB.NET and
> I don't know the language too well. I am trying to add an object
> instance of a class to an array like in the code snipet below.
> I run through the For Each loop 5 times and I place a reference
> to the object in an ArrayList. Once I skip out of the loop block
> I expect to have 5 different instances of that class in the
> ArrayList. However, instead I have 5 instances of the class but
> they are all of the last one that was added.
>
>
> ObjList As ArrayList ' Declared at top of Form Class.
> ObjList = New ArrayList ' In an initialize method.
>
> ' Code below is in some method in same Form Class.
> Dim Info As InfoClass
> Dim CrntObj as SomeClass
>
> For Each Info in SomeArray ' 5 Info objects in SomeArray
> CrntObj = myMgr.GetSomeCl assObject(Info)
> ' do some stuff here
> ObjList.Add(Crn tObj)
> Next sInfo
>
>
> I know whats happening. I'm storing the reference to the
> CrntObj variable in the ArrayList instead of what it references.
> That's why I have 5 objects in the ArrayList all pointing to
> the last item that was added. But why? I believe this would be
> okay in C#. Can someone please help me out and tell me what I
> am doing wrong?
>
> Thanks,
> Joe[/color]

[Anchor]

Re: Adding an Object to an ArrayList

Great! Thanks for the info!

-- Joe


"Rick Rothstein" <rickNOSPAMnews @NOSPAMcomcast. net> wrote in message news:<dYCdnUdgL OvaRvDdRVn_iw@c omcast.com>...[color=blue]
> Almost everybody in this newsgroup is using VB6 or lower. While you may get
> a stray answer to VB.NET questions here, you should ask them in newsgroups
> devoted exclusively to .NET programming. Look for newsgroups with either the
> word "dotnet" or "vsnet" in their name.
>
> For the microsoft news server, try these newsgroups...
>
> microsoft.publi c.dotnet.genera l
> microsoft.publi c.dotnet.langua ges.vb
> microsoft.publi c.vsnet.general
>
> There are some others, but these should get you started.
>
> Rick - MVP
>
>
>
> "Anchor" <jmanzi@gtnetin c.com> wrote in message
> news:fb5c52a2.0 404021328.699a2 4ff@posting.goo gle.com...[color=green]
> > Hi All,
> >
> > I was hoping someone could help me out. I am new to VB.NET and
> > I don't know the language too well. I am trying to add an object
> > instance of a class to an array like in the code snipet below.
> > I run through the For Each loop 5 times and I place a reference
> > to the object in an ArrayList. Once I skip out of the loop block
> > I expect to have 5 different instances of that class in the
> > ArrayList. However, instead I have 5 instances of the class but
> > they are all of the last one that was added.
> >
> >
> > ObjList As ArrayList ' Declared at top of Form Class.
> > ObjList = New ArrayList ' In an initialize method.
> >
> > ' Code below is in some method in same Form Class.
> > Dim Info As InfoClass
> > Dim CrntObj as SomeClass
> >
> > For Each Info in SomeArray ' 5 Info objects in SomeArray
> > CrntObj = myMgr.GetSomeCl assObject(Info)
> > ' do some stuff here
> > ObjList.Add(Crn tObj)
> > Next sInfo
> >
> >
> > I know whats happening. I'm storing the reference to the
> > CrntObj variable in the ArrayList instead of what it references.
> > That's why I have 5 objects in the ArrayList all pointing to
> > the last item that was added. But why? I believe this would be
> > okay in C#. Can someone please help me out and tell me what I
> > am doing wrong?
> >
> > Thanks,
> > Joe[/color][/color]