.NET: DDD and ASMX, avoid multiple namespaces on proxy classes

I am new to DDD and at the moment I try to refactor a project towards a domain driven architecture. The project has a client and a server side (ASMX webservice). Now I created a class libary called "Domain" which is referenced by the client application as well as by the server.

Now I want my SOAP communication to be based on my domain model. But as you know the ASMX webservice creates some kind of proxy class library within the client as soon as a web reference is established.

This results in having each domain entity and value object twice under different namespaces.

1. Is it p开发者_如何学运维ossible to use the domain model for communication directly and avoid the generation of the ASMX proxy classes?

2. How are DTOs used within DDD? As you know, some domain parts might not be serializable (e.g. NHibernate / IList usage) so in the past I often created simpler DTO-versions of my entity classes. Is it a common practice to define DTO entities within the domain?

If you were to use WCF, you could have the service interface and DTO classes in a shared assembly that both the client and the server referenced. Converting your project to use WCF may not be too hard, but there is a lot of learning to do before you get started.

A shared interface assembly is only a good ideal if you wish the client and server to be tightly joined, hence it does not work well unless both side are owned by the same team.

Often trying to use the same classes on the server and client lean to deign problem, however sharing classes when it does fit the design saves a lot of work.

(Sorry I don’t think you can used a shared assembly with asmx, it is more a concept from the remoting side of .net history)

It is not possible to use original domain model (obtained by a reference -not a WEB reference- to the domain model) for communication with the ASMX: you must use the model exposed by asmx that is similar but not the same (i.e. List are transformed in Array).

It's possible -and easy- create many classes from many web-services having the same namespace.
Create a .bat file like this

"C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\wsdl.exe" /sharetypes /o:C:\code\MyProxy.cs /namespace:MyProxies http://website/FirstService.asmx http://website/SecondService.asmx  
Pause 

Where
-"C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\wsdl.exe" is wsdl.exe with relative path (it must be on your PC)
-/sharetypes means that you want only 1 namespace in the output
- /o:C:\code\MyProxy.cs is the .cs file name that will contain all the classes created
- /namespace:MyProxies is the namespace for all the classes created
- http://website/FirstService.asmx http://website/SecondService.asmx is the list of webservices that you need to call
- Pause means that you want window's shel to remain open to read the feedback of the operations.

NOTE
1) All instructions must be in one line (don't press enter); Pause in the second line.
2) If /o:C:\code\MyProxy.cs will be part of your solution (i think so) and you use source control, the file must be checked out to be overwritten by wsdl.exe