Array.Add () and += in PowerShell

$newArray = @()
$newArray.Add("Hello")

If I create a new array, and using the method Add(). Windows PowerShell will tell me :

Exception calling "Add" with "1" argument(s): "Collection was of a fixed size."

Reason:

When you use the $array.Add() method, you‘re trying to add the element into the array. An array is a collection of fixed size, so you will recieve an error.

So, what should I do ?

Solution 1:

$successfulArray = New-Object System.Collections.Generic.List[System.Object]

$successfulArray.Add("Hello")
$successfulArray.Add("World")

# When you need array, you can transfer like:
$successfulArray.ToArray()

Also a more simple solution 2:

$easyArray = @()
$easyArray += "Hello"
$easyArray += "World"

　　PS creates a NEW array with the same elements as $array+ the one(s) you‘re adding, and then it overwrites the original.