Hello.
What is the correct syntax in VB.NET for checking that a value is in set of
value ?
pseudo code :
value in ('a','b','c') ...

Thanks

Mr. X. wrote:
What sort of set? If it's a List, then

If myList.Contains(someValue) Then...

--
Andrew

What I meant is :
dim a as integer
....
a = 3

What should I do instead of :
if a = 1 or a = 2 or a = 5 or a = 18 or a = 33
The pseudo code for short solution is :
if a in (1,2,5,18,33) ...
but the above does't work in VB.NET.
What should I write instead of above ?

Thanks

"Andrew Morton" <akm (AT) in-press (DOT) co.uk.invalid> wrote

On 26/06/2010 19:15, Mr. X. wrote:

Dim values As New List(Of Integer)(New Integer() {1,2,5,18,33})
If (values.Contains(a)) Then
. . .

HTH,
Phill W.

If this is the only solution, so I shall manage it.
but it seems too complicated writing this on code - it's a basic thing.
Each time I need this I shall write "
if (new list(of integer)(New integer(){1,2,5,18,13}).contains(a) ...

Thanks

"Phill W." <p-.-a-.-w-a-r-d-@-o-p-e-n-.-a-c-.-u-k> wrote

Am 28.06.2010 17:28, schrieb Mr. X.:
- You only have to create the list once. (At design time as well as at run time).
- You can make the same list accessible from different locations.


--
Armin

On 28/06/2010 16:28, Mr. X. wrote:
"Basic" to you and I, perhaps, but how would Our Friends in Redmond set
about implementing it as a Framework class?

It would be some sort of "Set" class that you could create based on a
given list of values.
Then it would have to have a Contains method (or Intersection, if this
is a Set).
Then, and this is the "Fun" part, it would have to be a Generic template
so that it could be used with objects of /any/ Type.

It's turning into a mini project all of its own.

YMMV, but I've often written my own methods for this sort of thing,
along the lines of:

Function IsIn( _
ByVal iValue As Integer _
, ByVal ParamArray iList As Integer() _
) As Boolean
For Each iEach As Integer In iList
If iEach = iValue Then
Return True
End If
Next
Return False
End Function

? IsIn( a, 1, 2, 5, 18, 13 )

HTH,
Phill W.

Phill W. expressed precisely :

IEnumerable(Of T) already has an Intersect, Union, and Except as
Extension methods.


--
Tom Shelton

In article <#0uDluVFLHA.4504 (AT) TK2MSFTNGP02 (DOT) phx.gbl>, Mr. X.
<nospam (AT) nospam_please (DOT) com> wrote:

The problem is that VB (and C#) doesn't have the concept of a set as a
base type, the FRAMEWORK has collections, but until 2010 VB didn't have
a simple collection initializer (which means that you couldn't leverage
that into what you want).

With VB.2010 you can do this:

array.IndexOf({1,2,5,18,33}, a) > -1

and it works (although an extension method would be much clearer).


(And why, why, is IndexOf a SHARED mehod instead of an instance method?
{1,2,5, 18, 23}.IndexOf(a) > -1 would almost be clear enough that you
wouldn't need an extension method).

--
J.B. Moreno

Can you give me some sample on IEnumerable, please.

Thanks

"Tom Shelton" <tom_shelton (AT) comcast (DOT) invalid> wrote