How to use rhinocommon to get data

Using Rhinoscript:: Rhino.SetAttributeData (strObject, strSection, strEntry, strValue) to assign data to the object. Then, how to use Rhinocommon to get the data, I do not want to quote Rhinoscript, but I do not know where the data dictionary exists

Review this thread and let me know if you have any questions.

http://discourse.mcneel.com/t/rhinocommon-equivalent-of-rs-getdocumentdata/31759

thank you