If you're using .Net 3.x there is an extension method that you can use on the AllKeys property
Dim nvc As New System.Collections.Special
If nvc.AllKeys.Contains("kumq
End If
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Question
How to check if a key exists in a NameValueCollection (System.Collections.Specialized.NameValueCollection)
Hi experts,
How can i check if a key exists in a namevaluecollection.
For hashtable we have something like containskey.
How can i check for namevaluecollection?
Regards
Abhinay
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Answers
You posted this in the VB and C# sections, so I don't know what you want your code in (or if you care which language, heh)
Anyways, you could use the "Get" method to get the value associated with a given key. If the specified key isn't within the NameValueCollection, it will just return null. So I would implement whatever it is you're trying to do like this in C# (where nvc is the name of your NameValueCollection instance):
String value = nvc.Get("Key to look for");
if(value == null)
{
// Key wasn't found
}
And I think it would look like this in VB.NET (though I never use VB, for good reason):
Dim value As String = nvc.Get("Key to look for")
If(value Is Nothing) Then
'Key wasn't found
End If
I stored the result beforehand in order to avoid searching for the key twice, as every time you search, you're "wasting" valuable time.
Hope it helps,
Nate
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by: x77Posted on 2009-11-04 at 14:16:09ID: 25744614
If MyNameValueCollection(Key)
This Collection Return Nothing if Key not exists.