c# - Custom Exceptions in PCL files -

i'm converting our .net business objects library pcl file can used xamarin ios/android , while contains poco objects, contains custom exceptions throwing errors.

take typical custom exception:

[serializable] public class encryptkeynotfoundexception : exception {     public encryptkeynotfoundexception()         : base() { }      public encryptkeynotfoundexception(string message)         : base(message) { }      public encryptkeynotfoundexception(string format, params object[] args)         : base(string.format(format, args)) { }      public encryptkeynotfoundexception(string message, exception innerexception)         : base(message, innerexception) { }      public encryptkeynotfoundexception(string format, exception innerexception, params object[] args)         : base(string.format(format, args), innerexception) { }      protected encryptkeynotfoundexception(serializationinfo info, streamingcontext context)         : base(info, context) { } } 

as expected pcl doesn't [serializable] , serializationinfo. while might away sticking [datacontract] instead of using [serialiable], still won't resolve issue serializationinfo.

is there anyway circumvent problem?

thanks.

update:

i've had @ implementing custom exceptions in portable class library suggested following 2 attributes not recognised:

[classinterfaceattribute(classinterfacetype.none)] [comvisibleattribute(true)] 

i must missing reference assembly?

i'm looking @ alternative solution provided in portable class library: recommended replacement [serializable]

hopefully work. update answer once have more info provide.

update:

classinterfaceattribute part of system.runtime.interoservices cannot add pcl project, @ least it's not visible. missing something?

the other article providing additional info , looks when using conditional compilation, should work, again, while sample code json library appears work, must missing cannot add reference [serializable] not throw error, don't appear able so.

one thing i've tried comment out:

protected encryptkeynotfoundexception(serializationinfo info,  streamingcontext context) : base(info, context) { } 

and can compile pcl project ok, question need this?

thanks.

i think have misinterpreted answer in suggested link. don't need add classinterfaceattribute or comvisibleattribute in custom exception implementation. if in exception class .net framework see :

[serializableattribute] [classinterfaceattribute(classinterfacetype.none)] [comvisibleattribute(true)] public class exception : iserializable, _exception 

and @ exception class silverlight, this

[classinterfaceattribute(classinterfacetype.none)] [comvisibleattribute(true)] public class exception 

serializableattribute not available.

another diference exception class silverlight has 3 constructors. constructor exception(serializationinfo, streamingcontext) not available. , can see in below screenshot of custom exception implementation in pcl library 3 constructors available exception. there no such constructor available trying create :

encryptkeynotfoundexception(serializationinfo info, streamingcontext context)    : base(info, context) { } 

so, in pcl custom exception implementation datacontract instead of serializable, :

[datacontract] public class encryptkeynotfoundexception : system.exception {     public encryptkeynotfoundexception() : base() { }      public encryptkeynotfoundexception(string message) : base(message) { }      public encryptkeynotfoundexception(string message, exception innerexception) : base(message, innerexception) { } }