Visual Basic 2015 Unleashed

The Dictionary(Of TKey, TValue) Collection

The System.Collections.Generic.Dictionary(Of TKey, TValue) collection is the generic counterpart for the HashTable. Each item within a Dictionary is a key/value pair; therefore, the constructor requires two arguments (TKey and TValue) where the first one is the key and the second one is the value. The following code shows instantiating a Dictionary(Of String, Integer) in which the String argument contains a person’s name and the Integer argument contains the person’s age:

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Dim peopleDictionary As New Dictionary(Of String, Integer)peopleDictionary.Add("Alessandro", 37)peopleDictionary.Add("Stephen", 27)peopleDictionary.Add("Rod", 44)

A single item in the collection is of type ...