Error: Variable is not assigned in the method

You are writing a own PowerShell class and get the following error "Variable is not assigned in the method". -> Here is the solution for this.

Error

Variable is not assigned in the method.

Cause

This error occurs because you are using a predefinied variable in a class method and the class method is in a different scope.

Example to reproduce the error

Class CustomFunction {
    [String]$Version
 
    GetVersion() {
        If ($PSVersionTable) {
            $this.Version = $PSVersionTable.PSVersion
        }
    }
}
 
$CustomFunction = [CustomFunction]::new()
$CustomFunction.GetVersion()
Write-Host $CustomFunction.Version

Solution

• Add the Scope to your variable ($GLOBAL:<YOUR_VARIABLE>)

Here the solution for the example above:

Class CustomFunction {
    [String]$Version
 
    GetVersion() {
        If ($GLOBAL:PSVersionTable) {
            $this.Version = $GLOBAL:PSVersionTable.PSVersion
        }
    }
}
 
$CustomFunction = [CustomFunction]::new()
$CustomFunction.GetVersion()
Write-Host $CustomFunction.Version