Hi,
I want to expose a enum from another class, is that possible and how?
Here's an example
Public Class ClassMaster
Public Enum Colors
Red
Green
Yellow
End Enum
End Class
Public Class Cars
Public ReadOnly Property Colors() As System.Enum
Get
Return ClassMaster.Col ors ' <- Error
End Get
End Property
End Class
Module Main
Public Sub Main()
Private color As Cars.Colors ' <- Error
End Sub
End Module
I know I can make the Enum global by putting it in a module, but I want
to expose it from another class.
I'm creating an application using three layer style, that is
"Presentati on layer", "Business layer" and "Data layer".
I do not want the "Presentati on layer" to reference the "Data layer".
They must know nothing about each others.
All communication to the "Data layer" must go through the "Business layer".
I have an enum in the "Data layer" which I want the "Presentati on layer"
to use, but it must go through the "Business layer".
Hope you get what I mean.
Any idea?
Thanks!
M O J O 5 4935
On Fri, 30 Jan 2004 14:37:07 +0100, M O J O
<mojo@_no_spam_ delete_this_new websolutions.dk > wrote:
----- begin ClassMaster.vb -----
Public Enum Colors
Red
Green
Yellow
End Enum
Public Class ClassMaster
'bla-bla
End Class
Public Class Cars
Public ReadOnly Property Colors() As System.Enum
Get
Return ClassMaster.Col ors ' <- Error
End Get
End Property
End Class
Module Main
Public Sub Main()
Private color As Cars.Colors ' <- Error
End Sub
End Module
------------ Now read here :)
You must declare an enum at the global section of the class, before you
begin the "Public Class" construction. AFAIC it works...
--
.... blood, sugar, sex, magic ...
CIA = Caught In Action programmer
"M O J O" <mojo@_no_spam_ delete_this_new websolutions.dk > schrieb Hi,
I want to expose a enum from another class, is that possible and how?
Here's an example
Public Class ClassMaster
Public Enum Colors Red Green Yellow End Enum
End Class
Public Class Cars
Public ReadOnly Property Colors() As System.Enum Get Return ClassMaster.Col ors ' <- Error
"ClassMaster.Co lors" is a type, not a value. You would have to write
Return ClassMaster.Col ors.Red
- or, if you want to return the type -
Public ReadOnly Property Colors() As Sytem.Type
Get
Return GetType(ClassMa ster.Colors)
End Get End Property
End Class
Module Main
Public Sub Main() Private color As Cars.Colors ' <- Error End Sub
End Module
I know I can make the Enum global by putting it in a module, but I want to expose it from another class.
I'm creating an application using three layer style, that is "Presentati on layer", "Business layer" and "Data layer".
I do not want the "Presentati on layer" to reference the "Data layer". They must know nothing about each others.
All communication to the "Data layer" must go through the "Business
layer". I have an enum in the "Data layer" which I want the "Presentati on layer" to use, but it must go through the "Business layer".
Hope you get what I mean.
I think I do, but where is the problem in exposing the "data layer" types?
If you don't want to do it, you'd have to write wrapper classes within the
business layer for all items in the data layer that you want to use in the
presentation layer.
How is this problem related to the Enum problem?
--
Armin
How to quote and why: http://www.plig.net/nnq/nquote.html http://www.netmeister.org/news/learn2quote.html
* M O J O <mojo@_no_spam_ delete_this_new websolutions.dk > scripsit: I want to expose a enum from another class, is that possible and how? [...] I know I can make the Enum global by putting it in a module, but I want to expose it from another class.
I'm creating an application using three layer style, that is "Presentati on layer", "Business layer" and "Data layer".
You may want to put the enum into a separate namespace, but I don't see
the sense of doing that.
--
Herfried K. Wagner [MVP]
<http://www.mvps.org/dotnet>
Hi M O J O,
Thanks for posting in the community.
Currently I am looking for somebody who could help you on it. We will reply
here with more information as soon as possible.
If you have any more concerns on it, please feel free to post here.
Thanks!
Best regards,
Gary Chang
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------
Hi Mojo,
Thanks for posting in the community.
First of all, I would like to confirm my understanding of your issue.
From your description, I understand that you wants to use an Enum type
defined in a class and encounter error.
Have I fully understood you? If there is anything I misunderstood, please
feel free to let me know.
I agree with Armin's suggestion. Return ClassMaster.Col ors ' <- Error
ClassMaster.Col ors is not a type, you may need to return an variable .
Private color As Cars.Colors ' <- Error
Cars.Colors is a property not a type. Also you should define a local
variable with private.
Here I change your code as follows.
Public Class ClassMaster
Public Enum Colors
Red
Green
Yellow
End Enum
End Class
Public Class Cars
Public ReadOnly Property Colors() As System.Enum
Get
Return ClassMaster.Col ors.Red
End Get
End Property
End Class
Module Main
Public Sub Main()
Dim color As ClassMaster.Col ors = ClassMaster.Col ors.Green
Dim oCar As New Cars
Console.WriteLi ne(oCar.Colors)
End Sub
End Module
If you have any concern on this issue,please post here.
Best regards,
Peter Huang
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "AS IS" with no warranties, and confers no rights.
--------------------Date: Fri, 30 Jan 2004 14:37:07 +0100 From: M O J O <mojo@_no_spam_ delete_this_new websolutions.dk > User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4)
Gecko/20030624 Netscape/7.1 (ax)X-Accept-Language: en-us, en MIME-Version: 1.0 Subject: Exposing enums from another class? Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Message-ID: <O$************ **@TK2MSFTNGP10 .phx.gbl> Newsgroups: microsoft.publi c.dotnet.langua ges.vb NNTP-Posting-Host: 0x503f60c3.virn xx9.adsl.tele.d k 80.63.96.195 Lines: 1 Path:
cpmsftngxa07.ph x.gbl!cpmsftngx a06.phx.gbl!TK2 MSFTNGP08.phx.g bl!TK2MSFTNGP10 .
phx.gblXref: cpmsftngxa07.ph x.gbl microsoft.publi c.dotnet.langua ges.vb:177509 X-Tomcat-NG: microsoft.publi c.dotnet.langua ges.vb
Hi,
I want to expose a enum from another class, is that possible and how?
Here's an example
Public Class ClassMaster
Public Enum Colors Red Green Yellow End Enum
End Class
Public Class Cars
Public ReadOnly Property Colors() As System.Enum Get Return ClassMaster.Col ors ' <- Error End Get End Property
End Class
Module Main
Public Sub Main() Private color As Cars.Colors ' <- Error End Sub
End Module
I know I can make the Enum global by putting it in a module, but I want to expose it from another class.
I'm creating an application using three layer style, that is "Presentatio n layer", "Business layer" and "Data layer".
I do not want the "Presentati on layer" to reference the "Data layer". They must know nothing about each others.
All communication to the "Data layer" must go through the "Business layer".
I have an enum in the "Data layer" which I want the "Presentati on layer" to use, but it must go through the "Business layer".
Hope you get what I mean.
Any idea?
Thanks!
M O J O
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