我可以在Powershell中创建一系列函数吗？

Question

I would like to have an array that contains a set of functions that I can iterate through and call. The issue is that the functions all run via the line that adds them to the array (ie. $scripts).

Example:

function Hello
{
    $BadFunction = "Hello"
    Write-Host "Hello!"
}

function HowAreYou
{
    $BadFunction = "HowAreYou"
    Write-Host "How are you?"
    #$false = $true
}

function Goodbye
{
    $BadFunction = "Goodbye"
    Write-Host "Goodbye!"
}

$scripts = @((Hello), (HowAreYou), (Goodbye))

foreach ($script in $scripts)
{
    $script
}

Answer 1

Functions can only be called by using their name, not referenced, but you can get the scriptblock via the Function: drive:

$scripts = $Function:Hello, $Function:HowAreYou, $Function:GoodBye

# call them with the & operator
$scripts | ForEach-Object { & $_ }

# You can also call them by calling Invoke on the scriptblock
$scripts | ForEach-Object Invoke

Answer 2

Joey's answer contains good information, but if all you need is to reference your functions by name , define your array as containing the function names as strings , and invoke the functions by those strings with & , the call operator :

function Hello {  "Hello!" }

function HowAreYou { "How are you?" }

function Goodbye { "Goodbye!" }

# The array of function names *as strings*.
# Note that you don't need @(...) to create an array.
$funcs = 'Hello', 'HowAreYou', 'Goodbye'

foreach ($func in $funcs)
{
  # Use & to call the function by the name stored in a variable.
  & $func
}

The issue is that the functions all run via the line that adds them to the array (ie. $scripts).

That's because your array elements are expressions (due to the enclosing (...) ) that call the functions (eg, (Hello) calls Hello and makes its output the array element), given that they're being referenced without single- or double-quoting .

Unlike in, say, bash , you cannot define string array elements as barewords (tokens without enclosing single- or double-quoting); for instance, the following is a syntax error in PowerShell:

# !! Does NOT work - strings must be quoted.
$funcs = Hello, HowAreYou, GoodBye # ditto with @(...)