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ElectricalAnalyticalNode.GetUpstreamNodeIds

Description:
Gets upstream node ids.
Remarks:
If node B supplies from node A, node B is the downstream node of node A, and node A is the upstream node of node B. Usually one node only has one upstream node, but TransferSwitch may have two upstream nodes.
public IList<ElementId> GetUpstreamNodeIds()
IList<ElementId> The array of upstream node ids.