Check if a Windows ListBox contains a string c# ignorecase?

Question

if (!lstFieldData.Items.Contains(ItemValue))
        MessageBox.Show(ItemValue + "Item not found.");

Above code is to get the list of items that is not in the list. Now i want to check this with ignoring the case. How do i?

@DDave - The answer is the same. Otherwise, what have you tried/researched? — Sayse, Jan 27 '15 at 08:09
@Sayse not really. It requires Enumerable object. Isn't it. I tried that too. — DDave, Jan 27 '15 at 08:10
[`ListBox.Items`](https://msdn.microsoft.com/en-us/library/system.windows.forms.listbox.objectcollection%28v=vs.110%29.aspx) is IEnumerable — Sayse, Jan 27 '15 at 08:11
This worked for me...thanx all if (!lstFieldData.Items.Cast().ToList().Contains(ItemValue,StringComparer.InvariantCultureIgnoreCase)) — DDave, Jan 27 '15 at 08:14
You have to cast, a ListBox contains objects, not strings. Use lstFieldData.Items.Cast().Contains(ItemValue, StringComparer.CurrentCultureIgnoreCase) — Hans Passant, Jan 27 '15 at 08:15

score 1 · Accepted Answer · answered Jan 27 '15 at 08:08

1

If your lstFieldData consists of only capital letters or lower letters you can use .ToUpper() or .ToLower().

lstFieldData
    A
    B
    C
    D

    if (!lstFieldData.Items.Contains(ItemValue.ToUpper()))
            MessageBox.Show(ItemValue + "Item not found.");
lstFieldData
a
b
c
d
    if (!lstFieldData.Items.Contains(ItemValue.ToLower()))
            MessageBox.Show(ItemValue + "Item not found.");

answered Jan 27 '15 at 08:08

President Camacho

1,860
6
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Provide code that you are talking about? – DDave Jan 27 '15 at 08:09
but my listbox is not sured about capitals ONLY or Lower latter only. It can be any... – DDave Jan 27 '15 at 08:12

score -1 · Answer 2 · answered Jan 27 '15 at 08:06

-1

if (strCompare.Equals("testcompare", StringComparison.InvariantCultureIgnoreCase))
{
///
}

try this

answered Jan 27 '15 at 08:06

Faisal

61
1
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Check if a Windows ListBox contains a string c# ignorecase?

2 Answers2