InvalidCastException and Remoting version compatibility
- From: schaf@xxxxxxxx
- Date: 16 Jan 2007 09:41:29 -0800
Hi NG !
I use your help very urgent!
2 years ago a remote application was created.
The DataService (DataService.dll) contains a IRemoteFactory, which
allows the client to get access to the corresponding interface (here
the implementation):
public sealed class VRemoteFactory : MarshalByRefObject,
IRemoteFactory {
private DataObject m_DataObj = null;
public IDataObject iDataObject {
get {
if (null == m_DataObj) {
m_DataObj = new DataObject();
}
return m_DataObj;
}
}
The class DataObject (implemented as MarshalByRefObject in the
DataService.dll) implements the IDataObject interface, which provides a
property 'Version' and a function to get an object of the class Data
(implemented as sealed Serializable).
Now I have to extend the DataService.
As described in the .NET Remoting book of Ingo, I created a new
interface IExtendedDataObject which inherits from IDataObject. The
DataObject class now implements IExtendedDataObject, with the new
property that returns a class ExtData (which inherits from Data (which
is no longer declared as sealed)). I did not change anything at the
VRemoteFactory.
So every thing works fine as long as I use the new addapted client with
the new DataService (DataServer.exe). But if I try to run my new Client
againts the old DataService (DataServer.exe) I get a
InvalidCastException (Return argument has invalid type), but I do not
know why ??? I get this exception as soon as I call the
IRemoteFactory.iDataObject in the client, but why ???
In a demo project every thing works!!!
Please help me!
PS: I read something about namespace clashes if the old version is
compiled in .NET 1.0 and the new in 1.1. ????
Thanks
.
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