Option Strict Disallows Late Binding

  • Thread starter Thread starter Paul Ilacqua
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Paul Ilacqua

The code below Fails to compile with option strict on... with off it is
fine. Where is the problem?

Function Find_In_List(ByVal alIn As ArrayList, ByVal iIndex As Integer,
ByVal sFindVal As String) As String
If alIn Is Nothing Then
Return ("")
End If
For i As Integer = 0 To alIn.Count - 1
If alIn.Item(i)(iIndex).ToString = sFindVal Then '---- Fails
Here
Find_In_List = alIn.Item(i)(0).ToString & "|" &
alIn.Item(i)(1).ToString & "|" & alIn.Item(i)(2).ToString
Exit For
End If
Next

End Function

Thanks
Paul
 
Paul said:
The code below Fails to compile with option strict on... with off it is
fine. Where is the problem?

Function Find_In_List(ByVal alIn As ArrayList, ByVal iIndex As Integer,
ByVal sFindVal As String) As String
If alIn Is Nothing Then
Return ("")
End If
For i As Integer = 0 To alIn.Count - 1
If alIn.Item(i)(iIndex).ToString = sFindVal Then '---- Fails
Here
Find_In_List = alIn.Item(i)(0).ToString & "|" &
alIn.Item(i)(1).ToString & "|" & alIn.Item(i)(2).ToString
Exit For
End If
Next

End Function

Thanks
Paul
Click to expand...

The problem is that you are using ArrayList, rather than, for example,
List (of String). ArrayList is holding Objects in your case. This is
frowned upon unless you are forced to use .Net version 1.1.
 
The code below Fails to compile with option strict on... with off it is
fine. Where is the problem?

Function Find_In_List(ByVal alIn As ArrayList, ByVal iIndex As Integer,
ByVal sFindVal As String) As String
If alIn Is Nothing Then
Return ("")
End If
For i As Integer = 0 To alIn.Count - 1
If alIn.Item(i)(iIndex).ToString = sFindVal Then '---- Fails
Here
Find_In_List = alIn.Item(i)(0).ToString & "|" &
alIn.Item(i)(1).ToString & "|" & alIn.Item(i)(2).ToString
Exit For
End If
Next

End Function

Thanks
Paul
Click to expand...

It looks to me like you have two problems here.

First, alIn.Item(i) is defined as type Object, and you are indexing
that object. You need to cast alIn.Item(0) to whatever it really is.
You could use the generic List(Of ) instead to tell the compiler
explicitly what is in the list.

Second, once you get the indexed value, you convert it to a String
with ToString and then compare that with an Integer. Assuming it
really contains an Integer, you need to cast it to an Integer.
 
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