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PowerShell if-statement with a condition in a string

stackoverflow.com › questions › 74797768 › powershell-if-statement-with-a-condition-in-a-string

You might use the $ExecutionContext.InvokeCommand.ExpandString method to evaluate the string expression:

Copy$test = 5
$myCheckTest = '$test -eq 4'
$ExecutionContext.InvokeCommand.ExpandString("`myCheckTest)")
False
$myCheckTest = '$test -eq 5'
$ExecutionContext.InvokeCommand.ExpandString("`myCheckTest)")
True

Note that the backtick (`) prevents the first dollar to be substituted so that you actual string expression will be something like: test -eq 4)
Or in your function:

Copyif ($ExecutionContext.InvokeCommand.ExpandString("`myCheckTest)")) {
    write-host "TEST MATCH"
} else {
    write-host "TEST NO MATCH"
}

A more common way to do thing like this is, is to use a scriptblock:

Copy$myCheckTest = {$test -eq 4}
$test = 5

if (&$myCheckTest) {
    write-host "TEST MATCH"
} else {
    write-host "TEST NO MATCH"
}

Answer from iRon on Stack Overflow

Microsoft Learn

learn.microsoft.com › en-us › powershell › scripting › learn › deep-dives › everything-about-if

Everything you wanted to know about the if statement - PowerShell | Microsoft Learn

Please check out his blog at PowerShellExplained.com. Your scripts often need to make decisions and perform different logic based on those decisions. This is what I mean by conditional execution. You have one statement or value to evaluate, then execute a different section of code based on that evaluation. This is exactly what the if statement does.

Stack Overflow

stackoverflow.com › questions › 74797768 › powershell-if-statement-with-a-condition-in-a-string

PowerShell if-statement with a condition in a string - Stack Overflow

Top answer

1 of 3

You might use the $ExecutionContext.InvokeCommand.ExpandString method to evaluate the string expression:

Copy$test = 5
$myCheckTest = '$test -eq 4'
$ExecutionContext.InvokeCommand.ExpandString("`myCheckTest)")
False
$myCheckTest = '$test -eq 5'
$ExecutionContext.InvokeCommand.ExpandString("`myCheckTest)")
True

Note that the backtick (`) prevents the first dollar to be substituted so that you actual string expression will be something like: test -eq 4)
Or in your function:

Copyif ($ExecutionContext.InvokeCommand.ExpandString("`myCheckTest)")) {
    write-host "TEST MATCH"
} else {
    write-host "TEST NO MATCH"
}

A more common way to do thing like this is, is to use a scriptblock:

Copy$myCheckTest = {$test -eq 4}
$test = 5

if (&$myCheckTest) {
    write-host "TEST MATCH"
} else {
    write-host "TEST NO MATCH"
}

2 of 3

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/invoke-expression

A collegae pointed me to the Invoke-Expression command:

Copyif (Invoke-Expression $myCheckTest) {
    write-host "TEST MATCH"
} else {
    write-host "TEST NO MATCH"
}

This works within my actual script.

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