Creates a new instance of a Structural Connection Handler, which defines the connection between given elements. Elements should be of the following structural categories: framings, columns, walls, floors or foundations. The first of given elements is set as the primary one. 
   Namespace:   Autodesk.Revit.DB.Structure  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 17.0.0.0 (17.0.1090.0) 
  Since:  2017 
Syntax
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Parameters
- document
 -  Type:  Autodesk.Revit.DB Document  
The Revit document. 
- idsToConnect
 -  Type:  System.Collections.Generic IList   ElementId  
The ElementIdArr containing element id of connected elements. 
Return Value
Returns created connection.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | This ElementIdArr is invalid. It should contain ids of the following structural categories: framings, columns, walls, floors or foundations. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL | 
| Autodesk.Revit.Exceptions InvalidOperationException | 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). | 
| 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. |