Powershell: Cannot convert value to type System.String

Question

I have an array of Reciepients:

$reciepientList = @(
    "foo"
    "bar"
    #...
)

I want to send a Message to all of them with a function using REST:

function Send-Message{
    [CmdletBinding()]
    param (
        [parameter(Mandatory=$true)][String]$Message,
        [parameter(Mandatory=$true)][String]$Reciepient
    )
# My RESTful stuff goes here ...
Invoke-RestMethod ...
}

Sending my message fails:

Send-Message -Reciepient $reciepientList -Message "My message"

Output:

Send-Message: Cannot process argument transformation on parameter 'Reciepient'.
Cannot convert value to type System.String.

Any idea, how to tell Powershell to convert my Array to a String?

Your $reciepientList is not a Hash, but a string array. Change the parameter type casting from [string] to [string[]]. ([parameter(Mandatory=$true)][String[]]$Reciepient), or join the email addresses with a semi-colon (;), depending if your Send-Message function needs a combined string or an array of recipients. — Theo
– Theo, Commented Jan 15, 2021 at 12:31
You could also leave the function unchanged, instead expand the list and process each item separately $reciepientList | % { Send-Message -Reciepient $_ -Message "Your message" } — Nikolay Polyagoshko
– Nikolay Polyagoshko, Commented Jan 15, 2021 at 21:08

Gill-Bates · Accepted Answer · 2021-01-15 13:12:08Z

2

@Theo: Thanks for pointing me to the type casting. It has solved my issue!

[CmdletBinding()]
param (
    [parameter(Mandatory = $true)][String]$Message,
    [parameter(Mandatory = $true)][String[]]$Reciepient
)

answered Jan 15, 2021 at 13:12

Gill-Bates

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