Set ArcMap Data Frame in Decimal Degrees Using ArcObjects

Question

I use a piece of code for dynamically loading feature layers.  Either before or after the loading, I need to set the Data Frame in Decimal Degrees.  Is there such a piece of code that can set / change the Data Frame's setting?  Thanks.

Hornbydd · Answer

If the underlying data is in feet then a field calculate will return feet even though the map is displaying in decimal degrees. Also there is a difference between MapUnits and DistanceUnits read the remarks section here.

ShaningYu · Answer

Ken:

Thanks for your response.  I revised my program.  But after the feature layers are loaded, the frame still shows feet as the unit.  Besides, the returned values (Calculated central X & Y) are still in feet.  Any new idea?  Thanks.

kenbuja · Answer

I believe you're overthinking it. Try this

m_Map = m_mxDoc.FocusMap;

m_Map.DistanceUnits = esriDecimalDegrees