Mastering Windows PowerShell Scripting - Third Edition

Adding and changing elements in a dictionary

As with the hashtable, the Add method may be used to add a new value to a dictionary:

$dictionary.Add("Computer1", "192.168.10.222") 

If the key already exists, using Add will generate an error, as was the case with the hashtable.

In a dictionary, the Contains method behaves differently from the same method in the hashtable. When checking for the existence of a key, the ContainsKey method should be used as follows:

if (-not $dictionary.ContainsKey("Computer2")) { 
    $dictionary.Add("Computer2", "192.168.10.13") 
} 

The dictionary supports the addition of elements using dot-notation:

$dictionary.Computer3 = "192.168.10.134" 

The dictionary leverages PowerShell's type conversion for both the key and ...