Web Service Question

[Guest]

Hi there,
I'm new to web services. I'm writing a basic file maintenance
application in asp.net. For example I'll fill a grid with all the records
from a table, then allow the user to select a record (row) and I'll show the
individual fields of the row in the form. The user can update the fields and
then I'd like to send the fields back through a web service for updating.
I've tried to specify a custom class as the parameter. See the example
below. My problem is that when I specify the class as a paramenterin the
client application I get a compile time error "Value of type
"IdealClass.atyMaint' cannot be converted to
'Ideal.updAccountType.atymaint." Atymaint is the name of my class. I have
this class defined in a project that is separate from my web service project
and my client project. I then reference this class from both the web service
and client projects. See the excerpts below.

From IdealClass project in atyMaint.vb

Public Class atyMaint

Public AMTYP as string
Public AMDESC as string
Public AMPRICE as string

End Class

From client project

dim atymaint as new idealclass.atymaint

atymaint.amtyp = me.txttype.text
atymaint.amdesc = me.txtdesc.text
atymaint.amprice = me.txtprice.text

dimWebservice as new updAccountType.updAccountType
errMsgString = Webservice.updAccountType(atymaint)

From web service project

<WebMethod () > _
Pubic Function updAccountType(ByVal atymaint as IdealClass.atyMaint) as
string

... stuff

End Function

 

[Lars-Erik Aabech]

Hiya!

I hope I can provide some help for you, but I'm not quite sure of all the
details as I have forgotten all about VB since C# arrived. Anyway, here's
some hints that might get it working..

When using a web reference you have to use the generated proxy class
'Ideal.updAccountType.atymaint' instead of 'IdealClass.atyMaint'. If you
want to do some plumbing, (and repetitive work ) you can fix this by
clicking "Show all files" in the Solution Explorer, navigate to your web
reference, expand it and it's Reference.map document. Inside you should find
Reference.vb. Comment out the proxy class, and replace all references to
atyMaint with IdealClass.atyMaint. You have to redo this every time you
update the web reference. In addition, you have to specify how
IdealClass.atyMaint should serialize as XML. Add
<System.Xml.Serialization.XmlRoot("atyMaint")> above Public Class atyMaint,
and <System.Xml.Serialization.XmlElement("AMTYP")> above Public AMTYP as
string etc.

There's a nice tool for generating web service proxy classes called wsdl.exe
included in the .net framework you can use to get rid of the update web
reference problem though. You can read more about it here:
http://msdn.microsoft.com/library/d...cpguide/html/cpconCreatingWebServiceProxy.asp
There's also a lot more info on web services in the same folder as that
article.

HTH,
Lars-Erik


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