How to get the count of the items of a combo box that starts with 'a'

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HI All,

I have a combo box with values like "a,a1,a2,b,b2". How do i get the count of the items of a combo box that starts with 'a'.

Please help.

Thanks.

Posted 21-May-14 8:02am

vidkaat

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3 solutions

Solution 2

Well you could use a foreach loop...or Linq:

C#

string[] items = new string[myComboBox.Items.Count];
myComboBox.Items.CopyTo(items, 0);
int count = items.Where(i => i.StartsWith("a")).Count();

Posted 21-May-14 8:22am

OriginalGriff

Comments

vidkaat 21-May-14 14:32pm

Thanks for the reply. I get the error "Where is not a member of the System.array"

Sergey Alexandrovich Kryukov 21-May-14 15:29pm

5ed.
—SA

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DamithSL · Accepted Answer · 2014-05-21T08:18:00

Solution 1

try below

VB

Dim mylines() As String = ComboBox1.Items.Cast(Of String).ToArray
Dim count As integer = mylines.Where(Function(s) s.StartsWith("a")).Count()

Or without using LINQ

VB

Dim count As integer =0
For each item As String in myComboBox.Items
  If item.StartsWith("a") Then
    count += 1
  End If
Next

Posted 21-May-14 8:18am

DamithSL

Updated 21-May-14 8:43am

v3

Comments

Sergey Alexandrovich Kryukov 21-May-14 15:28pm

5ed.
—SA

DamithSL 21-May-14 22:55pm

thank you SA

Karen Mitchelle 22-May-14 0:57am

5ed. :)

Maciej Los · Accepted Answer · 2014-05-21T08:27:00

Solution 3

I'd suggest to use Linq[^] query together with StartsWith[^] string method.

Have a look here: LINQ query examples[^]

It would be something similar to:

VB

Dim itmscnt As Integer = (From itm As Object In ComboBox1.Items
                          Where (itm.ToString.StartsWith("a"))).Count

MsgBox("Count of items starting with 'a': " & itmscnt.ToString)

Note: Not tested!

Posted 21-May-14 8:27am

Maciej Los

Updated 21-May-14 8:31am

v2

Comments

vidkaat 21-May-14 14:34pm

Is there any other possibility of getting this done without LINQ

Sergey Alexandrovich Kryukov 21-May-14 15:28pm

Why?!
And what do you think yourself? Isn't the answer obvious?
—SA

Sergey Alexandrovich Kryukov 21-May-14 15:28pm

5ed.
—SA

Maciej Los 21-May-14 15:32pm

Thank you, Sergey ;)

[no name] 24-May-14 20:42pm

-5