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How do I convert an array of String to UpperCase in VB.net?

Posted on 2015-01-29
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Last Modified: 2016-02-16
Hi:

I have an array of strings declared in vb.net

Dim someStrings() as String

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I now I could do a for loop and convert each member of the array to uppercase.

Is there a way I can elegantly convert the entire array to upper case using a LINQ query?
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Question by:jxbma
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by:rspahitz
ID: 40578742
How about something like this (not using LINQ):

Dim strAll  As String = Join(someStrings, "~")
strAll.toUpperCase()
someStrings = strAll.split("~")

(I'm not sure if the syntax is quite right, but it should be close, and could probably all be done in one line.)
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by:rspahitz
ID: 40578750
Here's a VBA version that works, although there are improvements in VB.Net (which I can check when I get home if the above doesn't quite work):

Sub x()
    Dim someStrings() As String
    ReDim someStrings(3)
    someStrings(0) = "kljdsklgjjkenrgh"
    someStrings(1) = ".dklsjgkldjklgdf"
    someStrings(2) = ".dsjfkldfsjkldfs"
    someStrings(3) = ". kldjfkldjs"
    Dim strAll As String
    strAll = UCase(Join(someStrings, "~"))
    someStrings = Split(strAll, "~")
    MsgBox someStrings(3)
End Sub

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Accepted Solution

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Fernando Soto earned 500 total points
ID: 40578842
Hi  jxbma;

To your question, "Is there a way I can elegantly convert the entire array to upper case using a LINQ query?", here you go.

Dim isNowUpper() As String = (From s As String In someStrings
                              Select s.ToUpper).ToArray()

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Expert Comment

by:masterpass
ID: 40578872
or something like this:

Dim someStrings() As String = {"aaa", "bbb", "ccc"}
Dim upperArray = someStrings.Select(Function(s) s.ToUpper()).ToArray()

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HTH :)
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Expert Comment

by:Mike Tomlinson
ID: 40579030
Here's a clean non-LINQ approach:
        Dim someStrings() As String = {"cat", "dog", "fish"}
        someStrings = Array.ConvertAll(Of String, String)(someStrings, Function(s) s.ToUpper)

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Author Closing Comment

by:jxbma
ID: 40582052
This is the solution I chose to go with. Thx!
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by:Fernando Soto
ID: 40582056
Not a problem jxbma, glad to help.
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