Option Strict and a Collection of Structures

[zacks@construction-imaging.com]

A common programming technique I use in VB is making a collection of
structures. But if Option Strict is on (which I would prefer), the .Add
that adds the structure to the collection is flagged with a compiler
error (invalid type conversion). Is there a way to use a collection of
structures WITH the Option Strict On?

[Michael D. Ober]

Re: Option Strict and a Collection of Structures

Can you change your structures to classes? I use collections of classes all
the time with no problems.

Mike Ober.

<zacks@construc tion-imaging.com> wrote in message
news:1132347820 .088966.284220@ f14g2000cwb.goo glegroups.com.. .[color=blue]
> A common programming technique I use in VB is making a collection of
> structures. But if Option Strict is on (which I would prefer), the .Add
> that adds the structure to the collection is flagged with a compiler
> error (invalid type conversion). Is there a way to use a collection of
> structures WITH the Option Strict On?
>[/color]

[m.posseth]

Re: Option Strict and a Collection of Structures

strange ,,,

changing structures to classes seems a bit odd to me as the TS might have a
good reasson to choose for a structure

when you do not need instancing , and ther are no actuall methods ( so the
struct only holds values ) i prefer to use structures also structures are
faster as classes in this case ( stack vs heap ) and more lightweight so
they seem perfect for this task.

I use structures in a hashtable , and i program always with option explicit
and option strict on


strange thingy i do not encounter this problem with a collection

Option Explicit On

Option Strict On

Public Class Form1

Inherits System.Windows. Forms.Form

Private Structure test

Friend a As String

Friend b As String

End Structure

Private sCol As Collection

Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click

sCol = New Collection

For i As Integer = 1 To 100

Dim strTest As New test

With strTest

..a = i.ToString

..b = "just a test"

End With

sCol.Add(sCol, i.ToString)

Next i

MsgBox("finishe d")

End Sub

End Class





regards

Michel Posseth [MCP]



<zacks@construc tion-imaging.com> wrote in message
news:1132347820 .088966.284220@ f14g2000cwb.goo glegroups.com.. .[color=blue]
>A common programming technique I use in VB is making a collection of
> structures. But if Option Strict is on (which I would prefer), the .Add
> that adds the structure to the collection is flagged with a compiler
> error (invalid type conversion). Is there a way to use a collection of
> structures WITH the Option Strict On?
>[/color]

[Joe Cool]

Re: Option Strict and a Collection of Structures

On Sat, 19 Nov 2005 10:07:07 +0100, "m.posseth"
<michelp@nohaus ystems.nl> wrote:
[color=blue]
>strange ,,,
>
>changing structures to classes seems a bit odd to me as the TS might have a
>good reasson to choose for a structure
>
>when you do not need instancing , and ther are no actuall methods ( so the
>struct only holds values ) i prefer to use structures also structures are
>faster as classes in this case ( stack vs heap ) and more lightweight so
>they seem perfect for this task.
>
>I use structures in a hashtable , and i program always with option explicit
>and option strict on
>
>
>strange thingy i do not encounter this problem with a collection
>
>Option Explicit On
>
>Option Strict On
>
>Public Class Form1
>
>Inherits System.Windows. Forms.Form
>
>Private Structure test
>
>Friend a As String
>
>Friend b As String
>
>End Structure
>
>Private sCol As Collection
>
>Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
>System.EventAr gs) Handles Button1.Click
>
>sCol = New Collection
>
>For i As Integer = 1 To 100
>
>Dim strTest As New test
>
>With strTest
>
>.a = i.ToString
>
>.b = "just a test"
>
>End With
>
>sCol.Add(sCo l, i.ToString)[/color]

Key difference in my usage and yours. The above statement in my usage
would have been:

sCol.Add(strTes t)

And yes that would work just fine. It when I try to do this:

For Each strText in sCol
do something
Next

THIS is where I get the error.
[color=blue]
>
>Next i
>
>MsgBox("finish ed")
>
>End Sub
>
>End Class
>
>
>
>
>
>regards
>
>Michel Posseth [MCP]
>
>
>
><zacks@constru ction-imaging.com> wrote in message
>news:113234782 0.088966.284220 @f14g2000cwb.go oglegroups.com. ..[color=green]
>>A common programming technique I use in VB is making a collection of
>> structures. But if Option Strict is on (which I would prefer), the .Add
>> that adds the structure to the collection is flagged with a compiler
>> error (invalid type conversion). Is there a way to use a collection of
>> structures WITH the Option Strict On?
>>[/color]
>[/color]

[m.posseth]

Re: Option Strict and a Collection of Structures

Hello well this works just fine with me
sCol = New Collection

For i As Integer = 1 To 100

Dim strTest As New test

With strTest

..a = i.ToString

..b = "just a test"

End With

sCol.Add(strTes t)

Next i

For Each Strval As test In sCol

Debug.WriteLine (Strval.a)

Debug.WriteLine (Strval.b)

Next

when i typed this
[color=blue][color=green]
>>sCol.Add(sCol , i.ToString)[/color][/color]


my head was probably not so clear :-) as it ofcourse should have been[color=blue][color=green]
>>sCol.Add(strT est, i.ToString)[/color][/color]


but anyway i have tested above code and it foes work on my computer ( with
option strict on )

regards

Michel Posseth [MCP]



"Joe Cool" <joecool@home.n et> wrote in message
news:1v2vn1tj0d nt7d18q4lb642lu a3qpbp76i@4ax.c om...[color=blue]
> On Sat, 19 Nov 2005 10:07:07 +0100, "m.posseth"
> <michelp@nohaus ystems.nl> wrote:
>[color=green]
>>strange ,,,
>>
>>changing structures to classes seems a bit odd to me as the TS might have
>>a
>>good reasson to choose for a structure
>>
>>when you do not need instancing , and ther are no actuall methods ( so the
>>struct only holds values ) i prefer to use structures also structures are
>>faster as classes in this case ( stack vs heap ) and more lightweight so
>>they seem perfect for this task.
>>
>>I use structures in a hashtable , and i program always with option
>>explicit
>>and option strict on
>>
>>
>>strange thingy i do not encounter this problem with a collection
>>
>>Option Explicit On
>>
>>Option Strict On
>>
>>Public Class Form1
>>
>>Inherits System.Windows. Forms.Form
>>
>>Private Structure test
>>
>>Friend a As String
>>
>>Friend b As String
>>
>>End Structure
>>
>>Private sCol As Collection
>>
>>Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
>>System.EventA rgs) Handles Button1.Click
>>
>>sCol = New Collection
>>
>>For i As Integer = 1 To 100
>>
>>Dim strTest As New test
>>
>>With strTest
>>
>>.a = i.ToString
>>
>>.b = "just a test"
>>
>>End With
>>
>>sCol.Add(sCol , i.ToString)[/color]
>
> Key difference in my usage and yours. The above statement in my usage
> would have been:
>
> sCol.Add(strTes t)
>
> And yes that would work just fine. It when I try to do this:
>
> For Each strText in sCol
> do something
> Next
>
> THIS is where I get the error.
>[color=green]
>>
>>Next i
>>
>>MsgBox("finis hed")
>>
>>End Sub
>>
>>End Class
>>
>>
>>
>>
>>
>>regards
>>
>>Michel Posseth [MCP]
>>
>>
>>
>><zacks@constr uction-imaging.com> wrote in message
>>news:11323478 20.088966.28422 0@f14g2000cwb.g ooglegroups.com ...[color=darkred]
>>>A common programming technique I use in VB is making a collection of
>>> structures. But if Option Strict is on (which I would prefer), the .Add
>>> that adds the structure to the collection is flagged with a compiler
>>> error (invalid type conversion). Is there a way to use a collection of
>>> structures WITH the Option Strict On?
>>>[/color]
>>[/color]
>[/color]