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Decouple BizTalk Transformation logic From The BizTalk Solution.

Need a BizTalk solution which has no map and it still does the transformation, READ ON……

This article speaks of using an external XSLT file to achieve  transformation in BizTalk solution. You can visualize this as an equivalent of  BizTalk map which is only using a XSLT file for the transformation logic except you will not be required to use a actual BizTalk map with this approach. This also means no map or XSL file will be deployed. Advantage with this approach is- If there is a change in the transformation logic just modifying the XSLT placed on the file server location is enough. Which mean without any fresh deployment or change to your VS BizTalk solution you have achieved a new transformation logic in the BizTalk workflow.

 How do we do that:
 1>Modify the BTSNTSvc config file and add new appSetting keys for the physical path of XSLT file. This is path where you are going to keep the XSLT file(Or you can use any custom config approach for storing the values, for example SSO MMC).
1>Create a helper class which will return a XmlDocument after applying the XSLT on the input source xml message.
 TransformMethodWe will be  leveraging Transform method in our BizTalk helper class which Executes the transform using the input document specified by the XmlReader object and outputs the results to an XmlWriter. The XsltArgumentList provides additional run-time arguments.

public void Transform(XmlReader input, XsltArgumentList arguments, XmlWriter results);

Now we can use an orchestration to call this method in a construct with MessageAssignment shape.
msgOP_Map = PKS_ExternalBizTalkTransformation.ApplyXSLT.ApplyXSLTToPayload(msgIpToMap, “YourXSLTFile.xsl”);
 Please let me know if you have any questions.
Note:For unit/local testing you will be required to use an app.config to define the XSL path since the BTSNTSvc app settings can be only accessed at BizTalk engine runtime .

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