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.NET Forum / ASP.NET / Web Services / March 2005Web service serialization of return type
I've been trying to find documentation that explains limitation of possible types that a webmethod can return. I realize xml serialization must take place to return the specified type. Must the return type of a webmethod implement ISerializable? I saw something about using SoapInclude or XMLInclude attribute to include other types in web services. Does this imply that it is possible to return any type, even some third party class? I'm really interested in returning something like a IBM.Data.DB2.DB2Connection object from a web method. I tried this and I can compile the ws but whenever I try to reference it, I get an exception ( Can't serialize Component.ISite )? > Must the return type of a webmethod implement ISerializable? No. > I saw > something about using SoapInclude or XMLInclude attribute to include other > types in web services. This is required when you have polymorphic behavior in serialized types. > Does this imply that it is possible to return any > type, even some third party class? Any type that can be XML serialized. Remember that XML serialization is not full-fidelity, and only public fields and properties will be serialized. > I'm really interested in returning > something like a IBM.Data.DB2.DB2Connection object from a web method. That would be an incredibally bad idea if it were possible. Which it isn't. Leaving aside the obvious secuirty and scalability problems, what would a copy of the connection look like? How would a client program that received the serialized connection use it remotely?  SignatureMickey Williams Author, "Visual C# .NET Core Ref", MS Press www.neudesic.com www.servergeek.com Mickey, Thanks for the info. My real goal is to construct a connection pooling gateway component that will reside on a server. This component would accept requests from many clients, and manage a limited number of DB2 connections to a mainframe. The DB2Connection object is a managed assembly from IBM, which works like the .NET SQLClient.Data.Connection class. A web service is the first technology I looked at, not knowing if it will work or not, with remoting the next option. At the conceptual level, it doesn't seem so crazy. If it is impossible to implement, with no available mechanism to marshall a "usable" connection object between computers- then yes it's not useful - that's what I'm trying to understand. The hope is that a client would receive the object, typecast it back to a DB2Connection if needed, then be able to call DB2DataReader.ExecuteReader. Yes, I'm hoping the reader would read from the mainframe, not the server. If there is a way in .NET, via serialization or marshalling, that an object of this nature, which obviously contains IP specific details, can be passed between computers, I'm trying to understand what it is. Thanks for clarification. RJ > > Must the return type of a webmethod implement ISerializable? > [quoted text clipped - 19 lines] > copy of the connection look like? How would a client program that received > the serialized connection use it remotely? Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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