How to convert the items in a listbox to an arraylist?

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Philip - 26 Feb 2007 11:44 GMT

Hi,

I want to make an arraylist of all the items in a listbox.

Can I do it like this:

CType(lstSelectedList.DataSource, ArrayList)

Or is there a better way in VB.NET (Framework 1.1)

thanks

Philip

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Patrick Steele - 26 Feb 2007 13:35 GMT

> Hi,
>
[quoted text clipped - 5 lines]
>
> Or is there a better way in VB.NET (Framework 1.1)

Maybe ListBox.Items.CopyTo would work for what you need? Do you know
what each item in the ListBox actually is? Strings? Ints? DataRows?

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Patrick Steele
http://weblogs.asp.net/psteele

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Philip - 26 Feb 2007 13:36 GMT

Hi, thanks,

all the items in the listbox are string values.

Philip

> > Hi,
> >
[quoted text clipped - 8 lines]
> Maybe ListBox.Items.CopyTo would work for what you need? Do you know
> what each item in the ListBox actually is? Strings? Ints? DataRows?

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Patrick Steele - 26 Feb 2007 13:51 GMT

> Hi, thanks,
>
> all the items in the listbox are string values.

Then you should be able to create a string array equal to the number of
items in your listbox and use the CopyTo method to copy the items into
the string array.

Signature

Patrick Steele
http://weblogs.asp.net/psteele

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Patrick Steele - 26 Feb 2007 13:58 GMT

> > Hi, thanks,
> >
[quoted text clipped - 3 lines]
> items in your listbox and use the CopyTo method to copy the items into
> the string array.

Sorry -- clarification:

You can copy the items into a string array and then create an arraylist
from the string array. Something like this:

Dim s(ListBox1.Items.Count) As String
Dim al As New ArrayList

ListBox1.Items.CopyTo(s, 0)
al = New ArrayList(s)

Signature

Patrick Steele
http://weblogs.asp.net/psteele

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Philip - 26 Feb 2007 13:42 GMT

Hi,

I tried to do it using 'CopyTo' but I got this compile error:

'System.Collections.ArrayList' cannot be converted to '1-dimensional array
of System.Object'.

Here is the code I tried:
lstSelectedList.Items.CopyTo(m_arrSelList, 0)

thanks for any help

Philip

> > Hi,
> >
[quoted text clipped - 8 lines]
> Maybe ListBox.Items.CopyTo would work for what you need? Do you know
> what each item in the ListBox actually is? Strings? Ints? DataRows?

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How to convert the items in a listbox to an arraylist?

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