Creating a List<T> in PowerShell
The following simple example tries to demonstrate how a
List<T> can be created in
PowerShell and how elements are added to the list and how the list is iterated over.
Additionally, it also shows that the elements are inserted as references so that they can be changed outside the list.
class cls {
[int ] $num
[string] $txt
cls(
[int ] $n,
[string] $t
) {
$this.num = $n
$this.txt = $t
}
}
#
# Create the list and specify the type of
# the elements that can be inserted to the list:
#
$list = new-object System.Collections.Generic.List[cls]
#
# Create two object of that specific type …
#
$obj_1 = [cls]::new(1, 'foo')
$obj_2 = [cls]::new(2, 'bar')
#
# … and insert (add) them to the list:
#
$list.add($obj_1)
$list.add($obj_2)
#
# Add another object more directly:
#
$list.add([cls]::new(3, 'baz'))
#
# The objects are references. So, when an object is changed
# outside of the list, its modification will be reflected
# further down where the iteration over the list takes place.
#
$obj_2.txt = 'changed'
#
# Iterate over the list's elements and
# print their member values:
#
foreach ($c in $list) {
write-host "$($c.num) $($c.txt)"
}
#
# 1 foo
# 2 changed
# 3 baz