Re: Nested objects?

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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