在导入的CSV中有条件地更改布尔变量

Question

I am working on a script and I want to compare an array to another array, and change a boolean value (from $false to $true) based on a result. This works fine on strings using the Replace method, but that doesn't exist for boolean values. Can anyone tell me how to do this?

$bv is an array of objects, as follows.

ServerName,Domain,Environment,Tier0
ServerA,usa,dev,$false
ServerB,usa,sit,$false

I am trying to compare that list to another list of Tier0 computers ( $t0List ) that looks like this.

ServerB
ServerC
ServerD

So if there is a match between the ServerName in column 1 of $bv and an entry in $t0List , then I want to change the Tier0 column in $bv to $true .

foreach ($b in $bv) {
if ($t0List -contains $b.ServerName) {
    $b.Tier0.Replace($b.Tier0,$true)
    }
}

The error I get with the above code is...

Method invocation failed because [System.Boolean] does not contain a method named 'Replace'.

Answer 1

There's no need to use something like replace, just assign the value with = :

foreach ($b in $bv) {
    if ($t0List -contains $b.ServerName) {
        $b.Tier0 = $true
    }
}

Want to simplify it even more? Just assign it the result of your -contains :

foreach ($b in $bv) {
    $b.Tier0 = $t0List -contains $b.ServerName
}

Answer 2

Maybe this helps you:

You can flip between $true and $false just by telling it -not to be

-not $true brings back $false

-not $false brings back $true

So

    foreach ($b in $bv) {
if ($t0List -contains $b.ServerName) {
    $b.Tier0 = -not ($b.Tier0) 
   }
}

or

    foreach ($b in $bv) {
if ($t0List -contains $b.ServerName) {
    $b.Tier0 = $true
    }
}

should work