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troubleshooting Question

How to avoid "Variable is used before it has been assigned a value."

Avatar of KarlTheHopeless
KarlTheHopelessFlag for United Kingdom of Great Britain and Northern Ireland asked on
Visual Basic.NET
13 Comments1 Solution1751 ViewsLast Modified:
The code below leads to a Warning Message about variable i.

The message reads ... "Warning      Variable 'i' is used before it has been assigned a value. A null reference exception could result at runtime.


Using MyReader As New Microsoft.VisualBasic.FileIO.TextFieldParser("c:\myvbastext\listoffilesandpaths.txt")
            MyReader.TextFieldType = Microsoft.VisualBasic.FileIO.FieldType.Delimited
            MyReader.Delimiters = New String() {","}
            Dim currentRow As String()
            While Not MyReader.EndOfData
                currentRow = MyReader.ReadFields()
                i += 1
                Nicknam(i) = currentRow(0)
                NameOfFile(i) = currentRow(1)
                PathOfFile(i) = currentRow(2)
                ExtensionOfFile(i) = currentRow(3)
                LengthOfRecords(i) = currentRow(4)
            End While
        End Using


But what am I supposed to do to avoid this Warning?

If I use Dim before the Block - e.g. Dim i As Integer = 0 - then I get an Error Message telling me that  "Variable 'i' hides a variable in an enclosing block.

So, how should I re-write the code above to avoid all these things?

Thank you.
Avatar of Shahan Ayyub
Shahan AyyubFlag of Pakistan imageStaff Software Engineer

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