Prompt to Select one type of object in .NetAPI(Ironpython)

---

Function

def PromptForEntity( prompt, filetype):
	global adoc
	global ed

	options = PromptEntityOptions("%s"%prompt)
	options.SetRejectMessage("\nThe selected object is not a %s\n"%str(filetype))
	options.AddAllowedClass(clr.GetClrType(filetype), True)


	result = doc.Editor.GetEntity(options)

	if result.Status != PromptStatus.OK:
		ed.WriteMessage("\n The select target is " +str(filetype) +" please select "  +str(filetype) + "  \n")

	if result.Status == PromptStatus.OK:
		ed.WriteMessage("\ntarget has been selected\n")
		ed.WriteMessage("\ntarget has been selected%s\n\n\n\n"%str(result.ObjectId))
		return result.ObjectId

	ed.WriteMessage("I will return Null  ")
	return ObjectId.Null

---

Example

try:
	surfaceId = PromptForEntity("Select the surface to add a boundary to", TinSurface)
	plineId = PromptForEntity("Select the object to use as a boundary", Polyline)

	coll = ObjectIdCollection()
	coll.Add(plineId)
	ed.WriteMessage("pLINE COLLECTION HAS BEEN MADE")

	oSurface = t.GetObject(surfaceId, OpenMode.ForWrite)

	#
	oSurface.BoundariesDefinition.AddBoundaries(coll, 100, SurfaceBoundaryType.Outer, True)

	oSurface.Rebuild()
	ed.WriteMessage("Rebuilt Done")

	# Commit before end transaction
	t.Commit()
except:
	ed.WriteMessage("Failed to add the boundary")

Reference

http://help.autodesk.com/view/CIV3D/2020/ENU/?guid=GUID-7C32E309-9B54-42A0-A4DC-C6FD592071F2