RE: web service error - urgent

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\viewkind4\uc1\pard\lang2052\f0\fs20 Hi Mike,
\par
\par Your original code is correct, you should return the ArrayList instance rather than the ArrayList.ToArray since your method's signature has marked the return type as "ArrayList".
\par
\par For your original problem
\par ===========
\par System.InvalidOperationException: The type Car List was not
\par expected. Use the XmlInclude or SoapInclude attribute to specify types that
\par are not known statically.
\par ===========
\par
\par As the error message indicate, you should add the "XmlInclude" attribute to specify the "Cars" type (or any other derived class type from Object you will add into ArrayList). For example:
\par
\par ====================
\par [WebMethod]
\par [XmlInclude(typeof(Cars))]
\par [return: XmlArrayItem(typeof(Cars))]
\par public ArrayList CarList()
\par \{
\par ArrayList list = new ArrayList();
\par
\par for (int i = 0; i < 5; i++)
\par \{
\par Cars car = new Cars();
\par car.cars = "cars_" + i;
\par car.make = "make_" + i;
\par
\par list.Add(car);
\par \}
\par
\par return list;
\par \}
\par ======================
\par
\par You can also add the XmlInclude attribute at class level such as below so that all the webmethods in the class can get this applied.
\par
\par =========
\par [XmlInclude(typeof(Cars))]
\par public class ArrayListService : System.Web.Services.WebService
\par \{
\par =========
\par
\par This attribute is to make the XMLSerialization for a class or a method be aware of some certain derived object types.
\par
\par Hope this helps some.
\par
\par Sincerely,
\par
\par Steven Cheng
\par
\par Microsoft MSDN Online Support Lead
\par
\par
\par
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