Using Enum type as Webservice Parameter

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Martin Engelhardt - 06 Apr 2006 14:33 GMT

Hi,

I want to use the following:

Class Test ...

Public Enum TestEnum as integer
Enum1 = 128
Enum2 = 256
End Enum

<Webmethod...> _
Public Sub TestSub( parm as TestEnum)
...
End Sub
...
End Class

The enum we want to use is a enum from oracle .net client (db-datatypes)
which we can't change. TestEnum is only an example.

On client app we see the enum, but the corresponding values are wrong:
Enum1 = 0
Enum2 = 1

So if we call TestSub(TestEnum.Enum1) then value isn't 128 but 0 ?
If it would be a custom enum, we could change the values to correspond, but
we can't change the oracle enum values ????

Would be .NET Remoting a better way to program such things ?

Martin

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Martin Kulov [MVP] - 07 Apr 2006 01:12 GMT

> Hi,
>
[quoted text clipped - 29 lines]
>
> Martin

Hi Martin,

when enum is serialized to XML only its string representation is send to the
client. That's the whole idea of XML communication channel. If you want to
transfer also the numeric value, you need to implement a custom solution.
Remoting would work in this case, but your decision to you Remoting or not
should not be based on this particular problem. It depends much more on the
transport protocol, network and software environment and others.
See "Choosing Communication Options in .NET" [1] for more information how to
make your choice.

[1]
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpguide/html/cp
conchoosingcommunicationoptionsinnet.asp

Regards,

Signature

Martin Kulov
http://www.codeattest.com/blogs/martin

MVP, MCT, MCSD.NET Early Achiever

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Steven Cheng[MSFT] - 07 Apr 2006 04:20 GMT

Hi Martin,

As Martin Kulov mentioned, generally enum types are represented by xsd
enumeration simple type like below:

<s:simpleType name="TestEnum">
- <s:restriction base="s:string">
<s:enumeration value="A" />
<s:enumeration value="B" />
</s:restriction>
</s:simpleType>

so it can not hold two value pairs(or the mapping info). For your
scenario,I think you can consider use the XmlEnumAttribute to
specify the enum's actual number value as the underlying xmlserialization
value. e.g:

=================
Public Enum TestEnum As Integer

<XmlEnum("128")> _
Enum1 = 128

<XmlEnum("256")> _
Enum2 = 256

End Enum
====================

thus, the "Enum1" will be transfered as "128", "Enum2" will be transfered
as "256" in SOAP message, and when arrive the other side, it will be
deserizlied to the .net enum value.

Hope this helps.

Regards,

Steven Cheng
Microsoft Online Community Support

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Using Enum type as Webservice Parameter

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