in WPF and for ComboBox control , how to get highlighted Index ?

Question

3.75/5 (4 votes)

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Hello,

I have a ComboBox in WPF ,
I need to get the index of highlighted Item
Not Selected Item and not Selected Index

for example:

int a = MyComboBox.SelectedIndex;

but I don't need this, I need the Index of Highlighted Item.

I mean I want the Index of the Item which I am scrolling on that with keyboard (Up , Down) and Mouse.

Thank you.

Posted 15-Mar-11 1:12am

MHMDD

Updated 15-Mar-11 1:59am

v3

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Sergey Alexandrovich Kryukov 15-Mar-11 20:42pm

Excellent question, my 5. I could not find the answer! Wow! I used to do it for Forms only.
--SA

Prerak Patel 15-Mar-11 23:39pm

I think, now my updated answer may help you have a look at how it works.

Sergey Alexandrovich Kryukov 16-Mar-11 0:39am

I think you got it! I'm testing...
--SA

MHMDD 16-Mar-11 1:48am

Thank you SAKryukov.
I don't realy know, Why microsoft hasn't presented any event for it ?!

Sergey Alexandrovich Kryukov 16-Mar-11 2:55am

Say thanks to Prerak. You know, there are good amount of functionality holes like that. There are two events, they are not fired (probably fired in other classes derived from Selector, not this one). Do you know that combo box is notoriously problematic. Internally, it consists of two windows: edit and list. It's very typical for libraries to provide separate access to each. Many other components have problem: TreeView, ListView. There is no virtual mode for Tree Views -- very wanted...
--SA

2 solutions

Solution 2

Hopefully, this thread[^] will give you a solution.

Posted 15-Mar-11 18:35pm

Abhinav S

Comments

Venkatesh Mookkan 16-Mar-11 0:37am

Good reference.

Abhinav S 16-Mar-11 0:46am

Thanks.

Tarun.K.S 16-Mar-11 2:18am

A better method. My 5!

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Prerak Patel · Accepted Answer · 2011-03-15T01:36:00

Solution 1

Add code to MouseMove of ComboBoxItem

or

<ComboBoxItem MouseMove="ComboBoxItem_MouseMove">Item 1</ComboBoxItem>

VB

Private Sub ComboBoxItem_MouseMove(ByVal sender As System.Object, ByVal e As System.Windows.Input.MouseEventArgs)
 'ComboBox1.Items.IndexOf(DirectCast(sender, ComboBoxItem)
End Sub

This is how you can get index of that item.

[Edit]
You can use this to get highlighted item on MouseMove and KeyDown of ComboBox.

VB

Private Function GetHighlightedItem(ByVal cbox As ComboBox) As Integer
  For Each item As ComboBoxItem In cbox.Items
    If item.IsHighlighted Then
      Return ComboBox1.Items.IndexOf(item)
    End If
  Next
  Return -1
End Function

Posted 15-Mar-11 1:36am

Prerak Patel

Updated 15-Mar-11 17:38pm

v4

Comments

MHMDD 15-Mar-11 7:54am

Thank you for answering
But:

It doesn't Work. I want to get the index of my highlighted Item, when I am scrolling on Items.

with Mouse and keyboard.

Prerak Patel 15-Mar-11 23:38pm

Hey, you should wait before vote the answer down. I was off. Anyways, updated the answer. Check it if it helps.

MHMDD 16-Mar-11 1:02am

I didn't vote down. I didn't vote at all.

Prerak Patel 16-Mar-11 1:03am

I thought that it is voted down just because I couldn't update it in time, so asked you to wait. Anyways, did it help?

Venkatesh Mookkan 16-Mar-11 0:35am

Dirty way. But definite would work. Have 5!

Prerak Patel 16-Mar-11 0:43am

Thanks

MHMDD 16-Mar-11 1:08am

Thank you, It's working now.

Prerak Patel 16-Mar-11 1:42am

You are welcome.

Sergey Alexandrovich Kryukov 16-Mar-11 1:34am

Excellent! I failed to find it. I confirm it works, I tested it. Yes, it's dirty, but I don't see another way. I was close, tried ComboBox.Items events (there are events), but they did not fire by the reason I don't know. Excellent!
--SA

Prerak Patel 16-Mar-11 1:42am

Thanks.

Tarun.K.S 16-Mar-11 2:19am

It did solve the question. My 5!

Prerak Patel 16-Mar-11 2:20am

Thanks Tarun