Returns an instance of an object that represents the external service with the given Id. 
   Namespace:   Autodesk.Revit.DB.ExternalService  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 22.0.0.0 (22.1.0.0) 
  Since:  2013 
Syntax
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Parameters
- serviceId
-  Type:  Autodesk.Revit.DB.ExternalService ExternalServiceId  
 Id of the service.
Return Value
The instance of the service or NULL if it cannot be found.Remarks
 The returned instance is either of type SingleServerService or MultiServerService. Users should cast the returned object to one of the classes if they need access to active servers. 
 Exceptions
| Exception | Condition | 
|---|---|
| Autodesk.Revit.Exceptions ArgumentNullException | A non-optional argument was null |