Sets Member Forces to element. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0) 
  Since:  2016 
Syntax
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Parameters
- memberForces
 -  Type:  Autodesk.Revit.DB.Structure MemberForces  
End to which member forces will be added is defined by setting [!:Autodesk::Revit::DB::Structure::MemberForces::Position] property in provided Member Forces object. 
Remarks
 If element already have member forces defined for that end, newly provided values replace current one. Member forces are strictly related with releases. This means that setting member forces values is reasonable only for directions that have releases set to false. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL |