Design - Object - Port Relationship
Overview
Objects and Ports are searchable within collections. The IDesign interface supports direct recasting into an ObjectCollection, whereby any object can then be searched for. Once objects are found, certain types can be recast into an IPortCollection whereby a port can be searched for. This is called Drill-Down. By the same token, parent interfaces are searchable by using the IExpressEntity.
Drill-Down
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The IDesign interface can be recasted into an IObjectCollection
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An Object Collection can query for an IObject by name, index or ID
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Certain types of Objects can be recasted into an IPortCollection
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A Port Collection can query for an IPort by name, index or ID
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All Ports and Objects support the IAttributeCollection
Parent Searching
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An Object's parent is the Design
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A Port's parent is an Object
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Object and Port Collections do not have parents
