Cor,
| Therefore I am in doubt now if the module used in this format is not a
| better choice than the Shared Class.
I agree if you "make a point" to qualify the module member's name I would
stay they are equal.
Unfortunately the IDE does not require you to qualify the module member's
name, nor does it require you to import the module name. This ease of
unqualified access of a Module's members is why I consider a shared class is
"better".
Yes you need take extra steps to define the shared class. However generally
you would define the class once, then use it a plethora of times. Its the
use a plethora of times where the benefit of the shared class over a module
is. When you prevent instantiating & inheriting a shared class, the compiler
will tell you if you forget to share one of its members...
Ideally I would prefer that VB introduce the equivalent of C#'s "static
class", a class that requires all shared methods and has no constructor.
Basically a Module that does not include the
Microsoft.Visua lBasic.Compiler Services.Standa rdModuleAttribu te in the
generated IL. As I understand that the StandardModuleA ttribute is what is
causing the implicit import.
--
Hope this helps
Jay B. Harlow [MVP - Outlook]
..NET Application Architect, Enthusiast, & Evangelist
T.S. Bradley -
http://www.tsbradley.net
"Cor Ligthert [MVP]" <no************ @planet.nl> wrote in message
news:Or******** ********@TK2MSF TNGP04.phx.gbl. ..
| Jay,
|
| Basically I don't agree with you in this because that written modules as I
| have seen them are mostly used as an unordered bunch of fields. I hate
that,
| but before answering you I took this time the effort by trying some
things.
|
| That made that I came by this.
|
| Public Module GiveMySin
| Public Function MyFunction() As Double
| Return Sin(90)
| End Function
| End Module
| Public Class GiveMyCos
| Public Shared Function MyFunction() As Double
| Return Cos(90)
| End Function
| End Class
|
| I can call those by
|
| Dim a As Double = GiveMySin.MyFun ction
| Dim b As Double = GiveMyCos.MyFun ction
|
| I can use in both intellisence. Used as this however, does the module
| protect me from forgetting to write the shared key word or in other words
| don't make it even necessary to write that..
|
| Therefore I am in doubt now if the module used in this format is not a
| better choice than the Shared Class.
|
| Or do you see that I miss something?
|
| :-)
|
| Cor
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| "Jay B. Harlow [MVP - Outlook]" <Ja************ @tsbradley.net> schreef in
| bericht news:e1******** *****@TK2MSFTNG P05.phx.gbl...
| > Bonzol,
| > In addition to the other Comments.
| >
| > A Module is implicitly imported into every source file (effectively at
the
| > project level). This cannot be turned off.
| >
| > A Class with Shared methods (such as System.Math) needs to be explicitly
| > imported into every source file or at the project level.
| >
| > Importing a class with shared methods allows to control if you want the
| > members qualified or not. For example:
| >
| > Imports System.Math
| >
| > Public Module MainModule
| >
| > Public Sub Main()
| > Dim d As Double = Sin(90)
| > End Sub
| >
| > End Module
| >
| > verses:
| >
| > Public Module MainModule
| >
| > Public Sub Main()
| > Dim d As Double = Math.Sin(90)
| > End Sub
| >
| > End Module
| >
| >
| > NOTE: When defining a class with only shared methods. I normally make it
| > Notinheritable with a private constructor. This prevents other
developers
| > from creating an instance of the class and prevents inheriting from the
| > class.
| >
| > Public NotInheritable Class Math
| >
| > Private Sub New
| > End Sub
| >
| > Public Shared Function Sin(value As Double) As Double
| > ...
| > End Function
| >
| > End Class
| >
| > A Module (or static class in C# 2.0) simply doesn't have the
constructor.
| > CLI/C++
| >
| > I find both classes with shared method & Modules beneficial in a fully
OOP
| > program. For example truly "global" functions such as System.Math or my
| > Generic IIF don't really fit in an OO world, and lend themselves well to
| > Modules... Normally I put utility/helper methods in a class with shared
| > methods, for example methods that need to be used from both Pages &
| > Controls
| > in ASP.NET while instantiating a class doesn't really bring any value to
| > the
| > solution...
| >
| > --
| > Hope this helps
| > Jay B. Harlow [MVP - Outlook]
| > .NET Application Architect, Enthusiast, & Evangelist
| > T.S. Bradley -
http://www.tsbradley.net
| >
| >
| > "Bonzol" <Bo****@hotmail .com> wrote in message
| > news:11******** **************@ p79g2000cwp.goo glegroups.com.. .
| > | vb.net
| > |
| > | Hey there, could someone just tell me what the differnce is between
| > | classes and modules and when each one would be used compared to the
| > | other?
| > |
| > | Any help would be great
| > |
| > | Thanx in advance
| > |
| >
| >
|
|
