How do i get rotation of wall using revit api?

Question

If an Element is family instance then:

(FamilyInstance.Location as LocationPoint).Rotation;

I can easily get a rotation easily for family instance.

If I try for wall

Curve curve = ((Wall).Location as LocationCurve).Curve;

Or anything like that.

For example :

1. In preceding image, trying to rotate wall to 90 Degree.

2. In below Image, after rotating 90 Degree

Need to get the rotated angle of the wall.

Answer 1

If your wall curve is a straight line, you can just grab the angle from the line: let V be the vector from the wall curve start to end point, and determine its angle to the X axis: angle = V.AngleTo(XYZ.BasisX).