Re: Nested objects?
- From: "CESAR DE LA TORRE [MVP]" <cdltll@xxxxxxxxxxx>
- Date: Tue, 18 Oct 2005 16:33:03 -0700
The problem deals with data-types (serializable or not serializable &
interoperable or not interoperable). When talking about interoperability, it
does no matter if you have multiple orders or orderlines but it DOES matter
what kind of Data-Types you are using.
--
CESAR DE LA TORRE
Software Architect
[Microsoft MVP - XML Web Services]
[MCSE] [MCT]
Renacimiento
[Microsoft GOLD Certified Partner]
"Arjen" wrote:
> Okay, thanks!
>
> Maybe I will use method 3... split up orders and orderlines.
>
> What happens when I want to return multiple orders or orderlines?
> Do I get the same problem (array?)?
>
> Thanks!
>
>
>
> "CESAR DE LA TORRE [MVP]" <cdltll@xxxxxxxxxxx> schreef in bericht
> news:40A61467-E82E-41E3-B4FA-8E74FF705018@xxxxxxxxxxxxxxxx
> > It depends of what you have (or could have) on the other side... I mean,
> > all
> > the app.consumers are .NET based or thay could be from any other platform
> > like Java?
> > ------------
> > A.- METHOD ONE.
> > If you have .NET on both end-points (WS and cosumer) you can use DataSets
> > (because DataSets are automatically serialized to XML), within that
> > DataSet,
> > one DataTable could be for the main Order and another DataTable could be
> > for
> > Order details. This is the easiest way to do it with .NET.
> > To do so, just return a DataSet as a return function value from your
> > WebMethod and get it from the consumer App. It is straight forward and
> > extremely easy.
> > BUT, using DataSets have several handicaps:
> > 1.- You'll have interoperability problem if you want to consume your
> > WebService from any other platform like Java, because of DataSet's Schema
> > issues. Take into account that .NET DataSets (like Vectors in Java) are
> > platform specific types that can't be represented easily in other
> > platforms.
> > This is because there is currently no single well-defined mapping between
> > such platform-specific types and XML. Just because a .NET client can
> > recognize a blob of XML as a Dataset, it doesn't mean a Web service client
> > written in Java can do the same. Interoperability problems arise as a
> > result.
> > 2.- Depending of your bandwidth, DataSets are a bit heavy (big XML
> > structures).
> > ----------
> > B.- METHOD TWO.
> > The other way is to use plain Clasess and structures, and define first
> > your
> > WSDL (it is called "Contract First"), and serializing those clasess using
> > Attributes, etc. This way, you'll have to work a little bit more (more
> > programming) but because you are defining "The Contract First" (WSDL), it
> > will be interoperable with any other platform like Java. It also will have
> > more performance because SOAP messages will likely have a lighter schema
> > and
> > XML.
> > To use plain classes ans serializing by your self, take a look to this
> > URL:
> > - Exposing custom-made classes through a Webservice and binding them to a
> > DataGrid
> > http://www.codeproject.com/vb/net/leaditwebservicewrapper.asp
> > This is a really nice article.
> > And:
> > - Contract First Web Services Interoperability between Microsoft .NET and
> > IBM WebSphere:
> > http://msdn.microsoft.com/vstudio/java/interop/websphereinterop/default.aspx
> >
> > BTW, about your question (using ArrayLists), here you have an example. BUT
> > using ArrayLists IS NOT INTEROPERABLE either. If all you have is .NET,
> > great.
> > But if you have Java on the other point..., you'll have problems:
> >
> > namespace Orders
> > {
> > [WebService(Namespace="http://services.orders";)]
> > public class OrdersService: WebService
> > {
> >
> > public struct Product {
> > public string name;
> > public int qty;
> > public float price;
> > }
> >
> > [WebMethod]
> > [XmlInclude(typeof(Product))]
> > public ArrayList updateOrderProducts(ArrayList products)
> > {
> > ArrayList newList = new ArrayList();
> > IEnumerator eList = products.GetEnumerator();
> > while(eList.MoveNext())
> > {
> > Product item = (Product)(eList.Current);
> > // DO whatever, f.i. updating each product...
> > newList.Add(item);
> > }
> > //Return Updated Products
> > return newList;
> > }
> > }
> > } (I have not tested this sample, just wrote it like it can be)
> >
> > So, it depends of your scenario.
> > Of course, if all you have is .NET and you are starting with WebServices,
> > DataSets and ArrayLists are really easy.
> >
> > --
> > CESAR DE LA TORRE
> > Software Architect
> > [Microsoft MVP - XML Web Services]
> > [MCSE] [MCT]
> >
> > Renacimiento
> > [Microsoft GOLD Certified Partner]
> >
> >
> > "Arjen" wrote:
> >
> >> Hi,
> >>
> >> I want to make a webservice that returns an order with orderlines.
> >> How can this be best done?
> >>
> >> Can this be done with an object order (class order) that haves a property
> >> arraylist of orderline objects (class orderline)?
> >>
> >> Hope someone can help, thanks!
> >>
> >>
> >>
>
>
>
.
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- From: CESAR DE LA TORRE [MVP]
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