I am confused about the visibility and the lifecycle of messages defined in 
an orchestration.
I have a message (let’s call it msgA) of a complex type (C# data class exp
ressed as XML document) that is to be passed to a Web service. Message is co
nstructed in a construction shape using a transformation. In the very next s
tep, in another constructio
n shape (created as intermediate step for debugging reasons) I am trying to 
set one of the fields of this message to a value acquired from another Web s
ervice invoked before the first construction shape. Compiler complains that 
“’msgA.messagePart’:
message part has not been initialized in construct statement”. How is that
 possible if the message was constructed in the previous construct shape thr
ough a transformation?

I am not getting this error if assignment is done in the same construction b
lock with the transformation. I appreciate that somebody puts some light on 
this case.

Thanks.

[ Post a follow-up to this message ]

Hi,

This is because in the second construction shape, the message is constructed
 again (e.g. it looses the data that was set in the first construction shape
. If you then try to set one of the fields, you will be attemting to access 
an unconstructed message.

One option is to perform both the operations in the same construction shape,
 as you will then perform the transform to assign the message values, then m
odify them.

Another option is to decalre another message (e.g. msgB), and use the second
 sonstruction shape to construct it, and assign it like this:

msgB = msgA;
msgB.Field = someValue;

Regards,

Alan



--
BizTalk & .net
Consulting Training Mentoring
Stockholm London Europe
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"Marcus" wrote:

> I am confused about the visibility and the lifecycle of messages defined i
n an orchestration.
> I have a message (let’s call it msgA) of a complex type (C# data class expressed
 as XML document) that is to be passed to a Web service. Message is constructed in a
 construction shape using a transformation. In the very next step, in another constr
uct
ion shape (created as intermediate step for debugging reasons) I am trying t
o set one of the fields of this message to a value acquired from another Web
 service invoked before the first construction shape. Compiler complains tha
t “’msgA.messagePart’
: message part has not been initialized in construct statement”. How is that possible if t
he message was constructed in the previous construct shape through a transformation?
>
> I am not getting this error if assignment is done in the same construction
 block with the transformation. I appreciate that somebody puts some light o
n this case.
>
> Thanks.
>

[ Post a follow-up to this message ]