Hi John,
Thank you for your interest in syncfusion products.
Regarding “definitive list of which field codes DocIO supports and doesn't support during a mail merge.”, in this line did you exactly mean Merge formats or list fields supported in DocIO?
Regarding the issue “Wrong space text added during mail merging”, we are not able to reproduce the mentioned issue in our latest version 9.1.0.20. We have prepared the sample for your requirement. Could you please find the sample from the below link. DocIO do not have support for updating the If field. Once the document is generated you need to manually update the field to get the correct field result.
Sample:
F98244-1805816156.zipOur latest version 9.1.0.20 is rolled out and available for download under the below location. Could you please try upgrading to our latest version and run the provided sample and let us know if this helps you.
Latest version down load link:
http://www.syncfusion.com/support/forums/general/98103/Essential-Studio-2011-Volume-1-Final-Release-v91020-available-for-downloadPlease let us know if you have any questions.
Regards,
Poornima