Identifies if provided assembly members are valid. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2012 
Syntax
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Parameters
- document
-  Type:  Autodesk.Revit.DB Document  
 The document.
- assemblyMemberIds
-  Type:  System.Collections.Generic ICollection   ElementId  
 Element ids to be tested for validity for membership of an assembly instance.
- assemblyId
-  Type:  Autodesk.Revit.DB ElementId  
 Id of the existing assembly to add components to. If invalid, the method return whether the components can be added to a new assembly
Return Value
True if all member ids are valid, false otherwise.Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |