Collection and multiple classes interacting via web service!?

Discussion in 'ASP .Net Web Services' started by Vaughn Haybittle, Aug 3, 2007.

  1. Hi,

    I have a few questions relating to web services. First some Background:

    I have developed two classes in ASP.Net (VB):
    1) The first is a class that contains some fields that represent header
    information. This class also contains a strongly typed collection. This is
    'Object A'
    2) The second class represents the line items for each record. For each
    line item I would expect the consumer of the web service to create an object
    from this class. Ideally each of these objects will be added to the
    collection of the object created ion 1 above. The entire object in 1 above
    will then be passed to a web service which will save the header information
    and process each item in the collection to a database. This is 'Object B'

    My questions are:

    A) How do I structre the WebService. I know a I need a webmethod that
    takes the 'Object A' above and saves its data to a database. However Unless
    I create a webmethod that has the two classes as arguements (i.e. 'Object A'
    and 'Object B') My WSDL file does not reflect the two classes which means
    that they can not be instabtiated by the consumer of the web service.

    B) I have written a test page. In this page I instantiate a new instance
    of the item in Object A (via the web reference) above and a new instance of
    the 'Object B' above. I then attempt to add 'Object B' to the collection in
    the 'Object A'.

    I need some aqdvice on how to structure my web class and how to consume the
    classes from the test page (aspx) page.

    C) Another question I have is that when I try to reference the Collection
    via the web service it appears as though it is an array rather than a
    collection. why is this?

    Fundamentally I am wanting to allow consumers to create an instance of
    Object B for every line item in a database table and to add that to a
    collection in Object A. Object A also has a few additional header fields
    which will then be populated. I then want to pass the populated 'Object A'
    to a web service that will write the header informatiuo and each item in the
    collection to a database.

    At present I can not seem to achieve this as either:
    i) My WSDL file does not reflect my classes
    ii) I am unable to populate the collection with multiple 'Object B's'
    iii) I am not consuming the web service correctly from my test page.
    (should I instantiate Object A and Object B in my web page and then add
    Object B to Oject A;'s collection in the consuming page or can I do this
    behind the scenes via private communication between Object A and Object B?

    Any suggestions or help wwould be appreciated.

    Warm Regards,

    Vaughn Haybittle, Aug 3, 2007
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