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Problem with remote enum in VB.NETMy client fetches an object from the remote server. The client clones the object and proceedes with its client processing. If I don't clone the object each use of the object results in requests to the server via the BinaryFormatterSink. Sometimes this produces a RemoteException. So, therefore I clone the object in the client. But I still get problem with an enum member in the object, refering the enum member causes trafic to the server via the BinaryFormatterSink which results in a RemoteException. That leeds to the question: how to clone an enum member in a class? Consider this: Public Class MyClass Public Enum MyEnum As Integer A = 1 B = 2 End Enum Public Id as Integer Public Name as String Public State as MyEnum Public Function Clone() as MyClass Dim o as New MyClass o.Id = Id o.Name = String.Copy(Name) o.State = State 'this is not a clone! enums are reference type return o End Function End Class How to clone the State enum? A more detailed description of my problem: -------------------------------------------------- There is a RemoteException thrown from the server when I log the state in the client: Debug.WriteLine("Current state = " & myObject.State.ToString()) The state.tostring() causes trafic to the server resulting in a RemoteException. If comment the trace line everything works fine! What happens and what should I do??? -- Regards, Lars Jönson Actually, enums are value types, not reference types, so just assigning
it to another enum should do the trick. I'm not sure why you get RemoteException though, what do the stack trace and message look like? Hi!
I thought also that the enum was a value type but when this occured it seemed that it wasn't. It seems that the compiler uses the system.enum class for the enumerations and then it must be of reference type. Also I'm using the enum.ToString() method writing the name of the enumeration. The RemoteException I get looks like: ---- Exception = System.Runtime.Remoting.RemotingException ------------------------------------------------------- Message = Requested Service not found Time = 2005-11-04 12:32:32 Class = SIEMENS.CMSbackup.Client.Client Method = clientTimer_Elapsed Target C = System.Runtime.Remoting.Channels.BinaryServerFormatterSink Target M = ProcessMessage Trace = Server stack trace: at System.Runtime.Remoting.Channels.BinaryServerFormatterSink.ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, IMessage& responseMsg, ITransportHeaders& responseHeaders, Stream& responseStream) Exception rethrown at [0]: at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous) at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args) at SIEMENS.CMSbackup.Client.Client.HandleNewManualReportState() in C:\Local\CMS\Tools\CMSbackup\Client\Client.vb:line 396 at SIEMENS.CMSbackup.Client.Client.clientTimer_Elapsed(Object sender, ElapsedEventArgs e) in C:\Local\CMS\Tools\CMSbackup\Client\Client.vb:line 248 After the client has fetched the object from the server and cloned it processing of the object is handled in another thread by using a timer. That thread sends the object to the UI via the Form.Invoke() method. And here the RemoteException is thrown as you can see above. For me it seems very strange, the application was in a release candidate state and deeply tested with only minor bugs. We then added a string member in the remote object and then this happened. -- Show quoteRegards, Lars Jönson "S. Senthil Kumar" wrote: > Actually, enums are value types, not reference types, so just assigning > it to another enum should do the trick. I'm not sure why you get > RemoteException though, what do the stack trace and message look like? > > I am going to go out on a limb here with both my knowledge of your issue and
my knowledge of my solution and of VB.NET.... I know there are issues with enums when they are compiled in separate assemblies that use non default numbering sequences. Try it without assigning values to your enum types. -Andrew Show quote "LarsJ" <LarsJ@online.nospam> wrote in message news:D66D53FE-3B5A-429D-811C-46306AF696B8@microsoft.com... > Hi! > My client fetches an object from the remote server. The client clones the > object and proceedes with its client processing. > If I don't clone the object each use of the object results in requests to > the server via the BinaryFormatterSink. Sometimes this produces a > RemoteException. > So, therefore I clone the object in the client. But I still get problem > with > an enum member in the object, refering the enum member causes trafic to > the > server via the BinaryFormatterSink which results in a RemoteException. > > That leeds to the question: how to clone an enum member in a class? > Consider this: > > Public Class MyClass > Public Enum MyEnum As Integer > A = 1 > B = 2 > End Enum > > Public Id as Integer > Public Name as String > Public State as MyEnum > > Public Function Clone() as MyClass > Dim o as New MyClass > o.Id = Id > o.Name = String.Copy(Name) > o.State = State 'this is not a clone! enums are > reference type > return o > End Function > End Class > > How to clone the State enum? > > A more detailed description of my problem: > -------------------------------------------------- > There is a RemoteException thrown from the server when I log the state in > the client: > Debug.WriteLine("Current state = " & myObject.State.ToString()) > The state.tostring() causes trafic to the server resulting in a > RemoteException. > If comment the trace line everything works fine! > > What happens and what should I do??? > > -- > Regards, > Lars Jönson Hi,
now I've tried that but it doesn't help, the RemoteException is still thrown... -- Show quoteRegards, Lars Jönson "Andrew Robinson" wrote: > I am going to go out on a limb here with both my knowledge of your issue and > my knowledge of my solution and of VB.NET.... > > I know there are issues with enums when they are compiled in separate > assemblies that use non default numbering sequences. Try it without > assigning values to your enum types. > > -Andrew > > > "LarsJ" <LarsJ@online.nospam> wrote in message > news:D66D53FE-3B5A-429D-811C-46306AF696B8@microsoft.com... > > Hi! > > My client fetches an object from the remote server. The client clones the > > object and proceedes with its client processing. > > If I don't clone the object each use of the object results in requests to > > the server via the BinaryFormatterSink. Sometimes this produces a > > RemoteException. > > So, therefore I clone the object in the client. But I still get problem > > with > > an enum member in the object, refering the enum member causes trafic to > > the > > server via the BinaryFormatterSink which results in a RemoteException. > > > > That leeds to the question: how to clone an enum member in a class? > > Consider this: > > > > Public Class MyClass > > Public Enum MyEnum As Integer > > A = 1 > > B = 2 > > End Enum > > > > Public Id as Integer > > Public Name as String > > Public State as MyEnum > > > > Public Function Clone() as MyClass > > Dim o as New MyClass > > o.Id = Id > > o.Name = String.Copy(Name) > > o.State = State 'this is not a clone! enums are > > reference type > > return o > > End Function > > End Class > > > > How to clone the State enum? > > > > A more detailed description of my problem: > > -------------------------------------------------- > > There is a RemoteException thrown from the server when I log the state in > > the client: > > Debug.WriteLine("Current state = " & myObject.State.ToString()) > > The state.tostring() causes trafic to the server resulting in a > > RemoteException. > > If comment the trace line everything works fine! > > > > What happens and what should I do??? > > > > -- > > Regards, > > Lars Jönson > > > Hi
Have you tried to change the enum type as a int type in your class and do the same job as now, will the exception be thrown? If yes, can you built a simple reproduce solution and send to me via removing "online" from my email address? Best regards, Peter Huang Microsoft Online Partner Support Get Secure! - www.microsoft.com/security This posting is provided "AS IS" with no warranties, and confers no rights.  |
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