BAM API

Question

Hi,
BizTalk Server 2013
I'm getting following error when I pass my XLANG messages to a method in the helper class and trying to create XML Document from it:
Inner exception: "Cannot use XLANGMessage.RetrieveAs to convert message part part with type Payments.Schemas.Vendor_Payments_BAM to type System.Xml.XmlDocument."
The error is coming at the following syntax in the helper class:
XmlDocument XmlDocMsg = (XmlDocument)msg[0].RetrieveAs(typeof(XmlDocument));
The error is coming only when there are multiple nodes under the root element. When there is only one segment, it works fine.
The same is working fine in BizTalk Server 2006 (with framework 2.0)
Any help will be greatly appreciated.

Answer 1

It seems like it is not passing the XML validation. Tried to send out the message from ODX using send port with XmlTransmit pipeline, getting following error:
Inner exception: The result set for the XPath expression '/*[local-name()='Vendor_Payments' and namespace-uri()='']/*[local-name()='Payment_Info' and namespace-uri()='']/*[local-name()='Payment_Run_ID' and
namespace-uri()='']' contains more than a single node. 
XML looks good to me with 3 nodes of Payment_Info
1) As your inner exception says that there are multiple nodes being returned with the xpath you are using. Check
whether you are assigning the result to a single node or an array of nodes. In case you are assigning the result to a single node, change it to an array and process accordingly.
<o:p>If you wish to assign the output of the XPath expression to a single node only, make use of below expression. This will extract first record instance using
XPath "position()" function.
'/*[local-name()='Vendor_Payments' and namespace-uri()='']/*[local-name()='Payment_Info' and namespace-uri()=''] and position()=1]/*[local-name()='Payment_Run_ID' and namespace-uri()='']'
2) For the error: Inner exception: "Cannot use XLANGMessage.RetrieveAs to convert message
part part with type Payments.Schemas.Vendor_Payments_BAM to type System.Xml.XmlDocument."
RetrieveAs method exposed by the XLANGPart class is not able to desterilize the content of the message part and creates an instance of the System.Xml.XmlDocument because
it’s not a valid XML returning more than 1 root node.
Rachit