VB.NET error using linq

Question

I am using the following example from Stackoverflow:
How to find the oldest Folder in a Folder vb.net

Dim dirPrograms As New DirectoryInfo("c:\program files")

' LINQ query for oldest directory
Dim dir = (From dir In dirPrograms.EnumerateDirectories()).Min(function (o) o.CreationTime).FirstOrDefault()

I get the following error: Range variable 'dir' hides a variable in an enclosing block or a range variable previously defined in the query expression.

No one else is complaining about an error so I assume I must be doing something wrong.

Rahul Singh · Accepted Answer · 2014-11-30 18:29:08Z

1

Do this:-

Dim directoryInfo = (From dir In dirPrograms.EnumerateDirectories())
                        .Min(function (o) o.CreationTime)

Your dir declared variable (where you are storing the result) is same as your range variable dir in query-From dir In dirPrograms.. so compiler is complaining as these names will be obviously confusing between the two, So you need to change either of the two names.

Apart from this, You should not use FirstOrDefault after a Min as Min method will return a single value and not IEnumerable.

edited Nov 30, 2014 at 18:29

answered Nov 30, 2014 at 18:23

Rahul Singh

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2 Comments

rerat Over a year ago

I had already tried that thinking it might help, but it gives me this error instead: 'FirstOrDefault' is not a member of 'Date'

Rahul Singh Over a year ago

@rerat - That's obviously a different error. Min will return just a single value and not IEnumerable so no need of 'FirstOrDefault'. Please check my edit.

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