Returns the number of custom attributes associated with items in the collection.
function GetAttrCount: Integer; override;
virtual __fastcall int GetAttrCount();
TCollection descendants can associate user-defined attributes with the items in the collection. Each attribute has a name and, for each item in the collection, a value that is a string. GetAttrCount returns the number of distinct attributes assigned to each item in the collection.
As implemented in TCollection, GetAttrCount always returns 0, because TCollection defines no custom attributes.
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