Sets the elements which the dimension will witness. 
   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
- elementsToDimension
-  Type:  System.Collections.Generic ICollection   ElementId  
 The elements which the dimension will witness.
Remarks
 The dimension will automatically find geometric references in the elements. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentException | some elements do not match the reference category required by the MultiReferenceAnnotationType. | 
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was NULL | 
| Autodesk.Revit.Exceptions InvalidOperationException | The MultiReferenceAnnotationType assigned to the options can't create MultiReferenceAnnotations by element. |