Create null message using BizTalk mapper XSLT

Question

Hi,
I have a requirement to check if a message contains a certian value, and if so, throw away the message.  Does anyone know how this could be done using BizTalk mapper/ XSLT?  It's an ESB messaging only solution so don;t want to introduce orchestratons
/ c# code.
In short is field A = 'yes' the message will be thrown away / made null. 
Thanks in advance.
GilesB

Answer 1

If you consider doing this in Receive-side with some pipeline component, I am afraid you can't eat the data at the receive pipeline. For a null returned, I believe at least a empty message would be published to message box.
Without orchestration, in message-only scenario one option you can consider is using a custom adapter where you can have your logic whether to send a stream/message out or not. Something like:
public bool TransmitMessage(IBaseMessage msg)
_terminate.Enter();
try
bool logMessages = Convert.ToBoolean(
GetAdapterConfigValue(msg.Context, "logMessages")
if ( logMessages ) {
SystemMessageContext ctxt = new SystemMessageContext(msg.Context);
//Add your logic using XPathReader - stream based XPath
//and check whether the message has the value your're looking for
bool isFound = false;
if (!isFound)
string msgData = "";
StreamReader reader = new StreamReader(msg.BodyPart.Data);
using (reader)
msgData = reader.ReadToEnd();
// discard the message
return true;
} finally {
_terminate.Leave();
Above is part of the send adapter code where you add your logic using XPathReader - stream based XPath and check whether the message has the value your're looking for. You can use
null send adapter as refernce and build your logic where it would check for the required value in your custom adapter.
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