Re: Binding Combobox to ArrayList (was User v Custom Controls)

The Class Library does a pretty good job of explaining which interfaces
a class must support in order to be a source for a combo box.

Regards,
J. Vince Pacella / OOCL Chicago
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-----Original Message-----
From: Richard Heintze [mailto:sieg_heintze@xxxxxxxxx] 
Sent: Thursday, February 26, 2004 9:20 AM
To: DOTNET-WINFORMS@xxxxxxxxxxxxxxxxxxx
Subject: Re: [DOTNET-WINFORMS] Binding Combobox to ArrayList (was User v
Custom Controls)


 Andy,
  Yes, please send me the code.
 Others,
   Can I stick an integer in a combobox as a value
 member? I think that might have been one problem. I
 notice that VB will let me store integers in the
 value
 column too (I thought this was a C++ problem, but I
 had the same problem with VB). I don't get an error
 untill I select an item with the
 "combobox1.SelectedValue" property.
  Hmmm... I wish I could do this ArrayList/combobox
databind
 with less code. Creating a special class for every
combobox I want to define is kinda of a pain.
Javascript/HTML programmers can do this (populate a
combobox with key/value pairs) with much greater ease
than WinForms programmers can.

  Incidently, Is there a more efficient data structure
we can use for large lists? If we pass it an
ArrayList, does this mean we are doing linear
searches? Can we bind a combobox to something more
efficient like a hash table or binary tree table?
   Thanks,
       Sieg


> --- Andy Schott <andy@xxxxxxxxxxxxx> wrote:
> > Richard,
> > One problem that I'm seeing (I think - I'm no
> where
> > near a managed C++
> > expert) is that you're not using managed strings.
> > Whenever you want a hard
> > coded string to be a managed string, you need to
> > prefix it with an 'S'.  For
> > example:
> > State __gc* pState = new State(S"WA",
> > S"Washington");
> >
> > That creates a new States passing it the managed
> > strings containing "WA" and
> > "Washington".
> >
> > I quickly converted the VB code that you posted,
> and
> > it worked fine.  If you
> > want me to, I'd be happy to e-mail you the code
> that
> > I wrote (it may not be
> > the best, but it works).
> >
> > Andy
> >
> > -----Original Message-----
> > From: Discussion forum for developers using
> Windows
> > Forms to build apps and
> > controls
> > [mailto:DOTNET-WINFORMS@xxxxxxxxxxxxxxxxxxx] On
> > Behalf Of Richard
> > Heintze
> > Sent: Wednesday, February 25, 2004 4:19 PM
> > To: DOTNET-WINFORMS@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [DOTNET-WINFORMS] User v Custom
> > Controls
> >
> > >
> > > Where's the problem?
> > >
> > > ArrayList __gc * l = new ArrayList();
> > > l->Add(S"Test1");
> > > l->Add(S"Test2");
> > > l->Add(S"Test3");
> > > comboBox1->DataSource = l;
> > >
> >
> > Can someone help me translate this into C++? When
> I
> > tried, the combobox
> > choked on the strings I gave it for the value and
> > display members.
> >
> > Public Structure State
> >     Private m_shortName, m_longName As String
> >
> >     Public Sub New(ByVal longName As String, ByVal shortName As 
> > String)
> >         Me.m_shortName = shortName
> >         Me.m_longName = longName
> >     End Sub
> >
> >     Public ReadOnly Property ShortName() As String
> >         Get
> >             Return m_shortName
> >         End Get
> >     End Property
> >
> >     Public ReadOnly Property LongName() As String
> >         Get
> >             Return m_longName
> >         End Get
> >     End Property
> > End Structure
> >
> > Private States() As State = {New State("Alabama",
> > "AL"), ..., New
> > State("Wyoming", "WY")}
> >
> > comboBoxState.DataSource=States 
> > comboBoxState.DisplayMember="LongName"
> >
> >
> >
> >
> >
> > From
> >
>
http://samples.gotdotnet.com/quickstart/aspplus/default.aspx?url=%2fquic
ksta
> > rt%2fwinforms%2fdoc%2fWinFormsData.aspx
> >
> >
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