Option Strict and a Collection of Structures

[zacks]

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]

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

Mike Ober.

<za***@construc tion-imaging.com> wrote in message
news:11******** **************@ f14g2000cwb.goo glegroups.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?

[m.posseth]

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]

<za***@construc tion-imaging.com> wrote in message
news:11******** **************@ f14g2000cwb.goo glegroups.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?

[Joe Cool]

On Sat, 19 Nov 2005 10:07:07 +0100, "m.posseth"
<mi*****@nohaus ystems.nl> wrote:

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)
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.

Next i

MsgBox("finish ed")

End Sub

End Class

regards

Michel Posseth [MCP]

<za***@constru ction-imaging.com> wrote in message
news:11******* *************** @f14g2000cwb.go oglegroups.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?

[m.posseth]

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

sCol.Add(sCol , i.ToString)

my head was probably not so clear :-) as it ofcourse should have beensCol.Add(strT est, i.ToString)

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

regards

Michel Posseth [MCP]

"Joe Cool" <jo*****@home.n et> wrote in message
news:1v******** *************** *********@4ax.c om... On Sat, 19 Nov 2005 10:07:07 +0100, "m.posseth"
<mi*****@nohaus ystems.nl> wrote:

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)

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.

Next i

MsgBox("finis hed")

End Sub

End Class

regards

Michel Posseth [MCP]

<za***@constr uction-imaging.com> wrote in message
news:11****** *************** *@f14g2000cwb.g ooglegroups.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?