The default Item property throws an exception if the requested key is not in the dictionary

 


Imports System
Imports System.Collections.Generic

Public Class Example

    Public Shared Sub Main() 
        Dim openWith As New Dictionary(Of String, String)
        Try
            Console.WriteLine("For key = ""tif"", value = {0}.", _
                openWith("tif"))
        Catch 
            Console.WriteLine("Key = ""tif"" is not found.")
        End Try


    End Sub

End Class

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8.	Make Dictionary based on your own Object
9.	Your own Generic List Dictionary
10.	Add some elements to the dictionary. There are no duplicate keys, but some of the values are duplicates.
11.	The Add method throws an exception if the new key is already in the dictionary.
12.	The Item property is the default property
13.	The default Item property can be used to change the value associated with a key
14.	If a key does not exist, setting the default Item property for that key adds a new key/value pair
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

The default Item property throws an exception if the requested key is not in the dictionary : Dictionary « Data Structure « VB.Net

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