It looks like the serialization that goes on as the exception gets
marshaled across into the other domain calls the Source property, which is
lazily initialized, and the lazy initialization is nullref'ing.
Unfortunately, I couldn't reproduce your problem locally on .NET v1.1--what
version are you using?

Does this happen for all exceptions? Or just BadImageFormat? To try to
narrow things down a bit, can you try something like:

Exception *ex = new BadImageFormatException(...);
ex->get_Source();
throw ex;

That would cause the initialization to happen sooner. (You shouldn't have
to do that; I'm just trying things out to try to narrow down the problem.)

Jonathan

This posting is provided "AS IS" with no warranties, and confers no rights.

--------------------

I'm having difficulty throwing any kind of exception from within a
secondary domain, and then catching it back in the primary domain.
(I'm writing a managed C++ assembly, Windows XP, Visual Studio .NET
2003).

The function foo() runs in the primary domain, creates a child domain,
instantiates an object within this domain, invokes some member which
throws an exception, then discards the child domain:

__gc struct Remote : public MarshalByRefObject
{
... Method(...)
{
/* Load() throws a 'BadImageFormatException' if i name a non-assembly,
  the exception is correctly marshalled back to the client exception
  handler in foo(), and everything is hunky-dory...*/

  Assembly::Load(...)

/* but if instead i construct the exception myself and throw it...*/

  throw new BadImageFormatException(...)

/* ...the runtime (marshaller?) complains that the exception is
  missing certain data members like the Source, and generates an
  exception of its own..*/
}
};

.... foo( ... )
{
  AppDomain* d = AppDomain::CreateDomain(S"...");

  try
  {
     Remote* r = (Remote*) d->CreateInstanceAndUnwrap(...);

     r->Method();
  }
  catch (BadImageFormatException* e)
  {
  /* caught fine when 'e' thrown by Assembly::Load() */
  }
  catch (Exception* e)
  {
  /* but end up here instead when thrown by me directly*/
  }
  __finally
  {
     AppDomain::Unload(d);
  }
}

Here is a dump of the exception that i actually catch - any idea what
gives?

Many thanks,

-----------------------------------------
Server stack trace:
at System.Exception.get_Source()
at System.Exception.get_Source()
at System.Exception.GetObjectData(SerializationInfo info,
StreamingContext co
ntext)
at
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSeriali
ze(Object obj, ISurrogateSelector surrogateSelector, StreamingContext
context, S
erObjectInfoInit serObjectInfoInit, IFormatterConverter converter)
at
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(O
bject obj, ISurrogateSelector surrogateSelector, StreamingContext
context, SerOb
jectInfoInit serObjectInfoInit, IFormatterConverter converter)
at
System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Obje
ct graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean
fCheck)
at
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(S
tream serializationStream, Object graph, Header[] headers, Boolean
fCheck)
at
System.Runtime.Remoting.Channels.CrossAppDomainSerializer.SerializeMessage
Parts(ArrayList argsToSerialize)
at
System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage..ctor(IMetho
dReturnMessage mrm)
at
System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage.SmuggleIfPos
sible(IMessage msg)
at System.Runtime.Remoting.Channels.CrossAppDomainSink.DoDispatch(Byte[]
reqS
tmBuff, SmuggledMethodCallMessage smuggledMcm,
SmuggledMethodReturnMessage& smug
gledMrm)
at
System.Runtime.Remoting.Channels.CrossAppDomainSink.DoTransitionDispatch(B
yte[] reqStmBuff, SmuggledMethodCallMessage smuggledMcm,
SmuggledMethodReturnMes
sage& smuggledMrm)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage
req
Msg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&
msgDa
ta, Int32 type)
at Mpl.Reader.ReadAttribute(String __unnamed000, Int32
__unnamed001)
at
?GetModuleAttribute@Mpl@@$$FYA?AV?$basic_string@DU?$char_traits@D@std@@V?$
allocator@D@2@@std@@V?$Substring@$$CBD@@W4module_attribute@1@@Z(basic_string
<cha
r,std::char_traits<char>,std::allocator<char>>* , Substring<char
const > __unna
med000, Int32 __unnamed001)}} {mnemonic {clr_exception}} {subsystem
{clr}} {deta
ils {{System.NullReferenceException: Object reference not set to an
instance of
an object.

Server stack trace:
at System.Exception.get_Source()
at System.Exception.get_Source()
at System.Exception.GetObjectData(SerializationInfo info,
StreamingContext co
ntext)
at
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.InitSeriali
ze(Object obj, ISurrogateSelector surrogateSelector, StreamingContext
context, S
erObjectInfoInit serObjectInfoInit, IFormatterConverter converter)
at
System.Runtime.Serialization.Formatters.Binary.WriteObjectInfo.Serialize(O
bject obj, ISurrogateSelector surrogateSelector, StreamingContext
context, SerOb
jectInfoInit serObjectInfoInit, IFormatterConverter converter)
at
System.Runtime.Serialization.Formatters.Binary.ObjectWriter.Serialize(Obje
ct graph, Header[] inHeaders, __BinaryWriter serWriter, Boolean
fCheck)
at
System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Serialize(S
tream serializationStream, Object graph, Header[] headers, Boolean
fCheck)
at
System.Runtime.Remoting.Channels.CrossAppDomainSerializer.SerializeMessage
Parts(ArrayList argsToSerialize)
at
System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage..ctor(IMetho
dReturnMessage mrm)
at
System.Runtime.Remoting.Messaging.SmuggledMethodReturnMessage.SmuggleIfPos
sible(IMessage msg)
at System.Runtime.Remoting.Channels.CrossAppDomainSink.DoDispatch(Byte[]
reqS
tmBuff, SmuggledMethodCallMessage smuggledMcm,
SmuggledMethodReturnMessage& smug
gledMrm)
at
System.Runtime.Remoting.Channels.CrossAppDomainSink.DoTransitionDispatch(B
yte[] reqStmBuff, SmuggledMethodCallMessage smuggledMcm,
SmuggledMethodReturnMes
sage& smuggledMrm)

Exception rethrown at [0]:
at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage
req
Msg, IMessage retMsg)
at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData&
msgDa
ta, Int32 type)
at Mpl.Reader.ReadAttribute(String __unnamed000, Int32
__unnamed001)
at
?GetModuleAttribute@Mpl@@$$FYA?AV?$basic_string@DU?$char_traits@D@std@@V?$
allocator@D@2@@std@@V?$Substring@$$CBD@@W4module_attribute@1@@Z(basic_string
<cha
r,std::char_traits<char>,std::allocator<char>>* , Substring<char
const > __unna
med000, Int32 __unnamed001)}}}