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[70-553] – 1. Section 1 – 1. Dev application – 2 – Group of data(2)

Manage a group of associated data using collections (System.Collections namespace)

Classi: Le classi non fanno che implementare le interfacce.:

ArrayList, implementa:  IList, ICollection, IEnumerable, ICloneable

Hashtable: implementa IDictionary, ICollection, IEnumerable, ICloneable .. e qualche altra interfaccia non di liste per la serializzazione e deserializzazione;

CollectionBase: è una classe astratta per collezioni fortemente tipizzate. Implementa IList, ICollection, IEnumerable.

Per usarla si deve creare una propria classe derivando da quella..

ReadOnlyCollectionBase: è una classe astratta per una collezione che, dopo la fase di creazione, diventa read-only

DictionaryBase: è la classe astratta per un dizionario: insieme di coppie chiave-valore.

DictionaryEntry: è la classe per definire la coppia chiave – valore.

Queue: è una lista tradizionale (FIFO), implementa ICollection, IEnumerable, Icloneable.

SortedList: è una sorta di dizionario ordinato per chiave, accessibile sia per chiave che per indice. Implementa:  ICollection, IEnumerable, ICloneable

BitArray: gestisce in modo compatto un array di bit. Implementa ICollection, IEnumerable, ICloneable.

Stack: è la classica lista LIFO. Implementa:  ICollection, IEnumerable, ICloneable

Comparer: serve per paragonare due oggetti, il costruttore puo’ prende la cultura come parametro. C’e’ anche una bella classe CaseInsensitiveComparer bello per paragonare le stringhe


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