adding multiple listbox items into one listbox

Question

I'm using vb.net form.

I have 8 listboxes (listbox1 , listbox2,listbox3..) each one contains many items and another empty listbox (listbox10). I'm trying to add first listboxes items into the listbox10

ex: ) listbox1 first items is 'A' , listbox2 first items is 'b' , listbox3 first items is 'c'...etc . Now listbox10 first item must be "Abc..."

The problem is i'm only able to add 3 listboxes into the listbox10 But i want to all 8 listboxes to include in the loop.

here is my code

Dim n As Integer = _
Math.Min(ListBox1.Items.Count, Math.Min(ListBox2.Items.Count,    ListBox3.Items.Count))

For i As Integer = 0 To n - 1
ListBox10.Items.Add( _
    ListBox1.Items(i).ToString + _
    ListBox2.Items(i).ToString + _
    ListBox3.Items(i).ToString)
Next

Looking at your Math.Min expression I presume that your listboxes contain a different quantity of items. Right? — Steve
– Steve, Commented Dec 16, 2015 at 13:11

Steve · Accepted Answer · 2015-12-16 13:28:50Z

4

Create a List<Listbox> of all the listboxes that you want to work on. Then, using Linq, is pretty easy to reach your objective

Dim controls = new List(Of Listbox)() From _
      { listbox1, listbox2, listbox3, ....etc.... }
Dim minCount = controls.Min(Function(x) x.Items.Count)
for x = 0 to minCount-1
    listbox10.Items.Add(string.Join(" ", controls.Select(Function(lb) lb.Items(x).ToString)))
Next

Of course, if all the Listbox have the same amount of items then the calculation to find the listbox with the lower amount of items is useless, you could replace it using the Items.Count of any Listbox (However, in defensive programming, I would leave it)

edited Dec 16, 2015 at 13:28

answered Dec 16, 2015 at 13:18

Steve

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10 Comments

bod Over a year ago

Thanks for the kind support, but alot of errors occur when trying above code

Steve Over a year ago

Sorry, this is C#, I will fix the answer for Vb.NET

bod Over a year ago

Don't worry at all :)

Steve Over a year ago

All right, that should be working as well for VB.NET (Do not forget to Imports System.Linq )

bod Over a year ago

So much appreciate your help .. but im trying to add the refrence linq .. but cant find it at all .. ill keep trying .. many thanks

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