C#: Determine Type for (De-)Serialization
- by dbemerlin
Hi,
i have a little problem implementing some serialization/deserialization logic.
I have several classes that each take a different type of Request object, all implementing a common interface and inheriting from a default implementation:
This is how i think it should be:
Requests
interface IRequest
{
public String Action {get;set;}
}
class DefaultRequest : IRequest
{
public String Action {get;set;}
}
class LoginRequest : DefaultRequest
{
public String User {get;set;}
public String Pass {get;set;}
}
Handlers
interface IHandler<T>
{
public Type GetRequestType();
public IResponse HandleRequest(IModel model, T request);
}
class DefaultHandler<T> : IHandler<T> // Used as fallback if the handler cannot be determined
{
public Type GetRequestType()
{
return /* ....... how to get the Type of T? ((new T()).GetType()) ? .......... */
}
public IResponse HandleRequest(IModel model, T request)
{
/* ... */
}
}
class LoginHandler : DefaultHandler<LoginRequest>
{
public IResponse HandleRequest(IModel mode, LoginRequest request)
{
}
}
Calling
class Controller
{
public ProcessRequest(String action, String serializedRequest)
{
IHandler handler = GetHandlerForAction(action);
IRequest request = serializer.Deserialize<handler.GetRequestType()>(serializedRequest);
handler(this.Model, request);
}
}
Is what i think of even possible?
My current Solution is that each handler gets the serialized String and is itself responsible for deserialization. This is not a good solution as it contains duplicate code, the beginning of each HandleRequest method looks the same (FooRequest request = Deserialize(serializedRequest); + try/catch and other Error Handling on failed deserialization).
Embedding type information into the serialized Data is not possible and not intended.
Thanks for any Hints.
