Creates a 2D BeamSystem with specified profile curves. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 2015.0.0.0 (2015.0.0.0) 
  Since:  2014 
Syntax
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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The document in which the new BeamSystem is created.
- profile
-  Type:  System.Collections.Generic IList   Curve  
 The profile of the BeamSystem.
- sketchPlane
-  Type:  Autodesk.Revit.DB SketchPlane  
 The work-plane for the BeamSystem.
- curveIndexForDirection
-  Type:  System Int32  
 Index of the curve in the profile to be used as direction. '0' means the default direction-to use the first curve in profile. The curve from the profile to be used as direction must be a Line.
Return Value
If successful, a new BeamSystem object will be returned.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | SketchPlane is not valid for BeamSystem creation. -or- The input profile contains at least one helical curve and is not supported for this operation. -or- The profile curves must be in the sketch plane. -or- The curve index must be valid and the curve to be used as direction must be a Line. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL | 
| Autodesk.Revit.Exceptions ModificationForbiddenException | The document is in failure mode: an operation has failed, and Revit requires the user to either cancel the operation or fix the problem (usually by deleting certain elements). -or- The document is being loaded, or is in the midst of another sensitive process. | 
| Autodesk.Revit.Exceptions ModificationOutsideTransactionException | The document has no open transaction. |