Add some elements to the dictionary. There are no duplicate keys, but some of the values are duplicates.

 

Imports System
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main() 
        Dim openWith As New Dictionary(Of String, String)

        openWith.Add("A", "a")
        openWith.Add("B", "b")
        openWith.Add("C", "c")
        openWith.Add("D", "d")

    End Sub

End Class

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10.	The Add method throws an exception if the new key is already in the dictionary.
11.	The Item property is the default property
12.	The default Item property can be used to change the value associated with a key
13.	If a key does not exist, setting the default Item property for that key adds a new key/value pair
14.	The default Item property throws an exception if the requested key is not in the dictionary
15.	TryGetValue can be a more efficient way to retrieve values
16.	ContainsKey can be used to test keys before inserting them
17.	When you use foreach to enumerate dictionary elements, the elements are retrieved as KeyValuePair objects.
18.	To get the values, use the Values property
19.	To get the keys alone, use the Keys property
20.	Use the Remove method to remove a key/value pair

Add some elements to the dictionary. There are no duplicate keys, but some of the values are duplicates. : Dictionary « Data Structure « VB.Net

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