VB.NET: Object reference not set to an instance of an object

[wbosw]

I'm receiving an object reference not set to an instance of an object on the
( RevLen = ReverseText.Length) line of code. Can anyone help with this problem?

Thanks,
William Boswell

For Each item As Integer In PositionArray

Dim RevLen As Integer

RevLen = ReverseText.Length

Dim j As Integer

Dim char2 As Char

For j = 0 To RevLen - 1

char2 = ReverseText.Chars(j)

If item = j Then

Char.ToUpper(char2)

End If

CapRevText += char2 + " "

Next

[Plater]

Where do you specify what ReverseText is?

For Each item As Integer In PositionArray
   Dim RevLen As Integer
   RevLen = ReverseText.Length
   Dim j As Integer
   Dim char2 As Char
   For j = 0 To RevLen - 1
      char2 = ReverseText.Chars(j)
   If item = j Then
      Char.ToUpper(char2)
   End If
   CapRevText += char2 + " "
Next
 

And shouldn't this:
For j = 0 To RevLen - 1

Really be this:
For j = 0 To RevLen.Length - 1

[wbosw]

ReverseText is scoped at the class level. The integer variable RevLen is holding ReverseText.Length.


Where do you specify what ReverseText is?

Code: ( vbnet )
For Each item As Integer In PositionArray
Dim RevLen As Integer
RevLen = ReverseText.Length
Dim j As Integer
Dim char2 As Char
For j = 0 To RevLen - 1
char2 = ReverseText.Chars(j)
If item = j Then
Char.ToUpper(char2)
End If
CapRevText += char2 + " "
Next


And shouldn't this:
For j = 0 To RevLen - 1

Really be this:
For j = 0 To RevLen.Length - 1

[Plater]

oops, that will teach me not to look closer (was thinking RevLen was your string)


If you have:
Dim RevLen As Integer
RevLen = ReverseText.Length

and the second line is giving you an object reference not set to an instance, that would imply that ReverseText is null (Nothing for you VBers).
Throw in a Not is Nothing (or whatever it is in VB) check beforehand?

[wbosw]

Thanks Plater, I looked a little closer myself and found why it was receiving the Null reference.

Thanks again,
Wbosw