PowerShellのClassのFieldとPropertyの扱いに関するメモ

powershell-class-fields.ps1

#
# PowerShell Class "Field" is converted to Property.
#
class PSClass
{
    [string]$Field1 = "F1"
}

Write-Output "Get Field information from [PSClass].GetMembers() -> returns Property"
[PSClass].GetMembers() | ? { $_.Name -eq "Field1" } | select Membertype | Out-String

Write-Output "Get Field information from [PSClass] | Get-Members -> returns Property"
$y = [PSClass]::new()
$y | Get-Member | ? { $_.Name -eq "Field1" } | select Membertype | Out-String

#
# Added C# Class Field is not converted to Property, but Get-Members returns "Property".
#
$code = @"
public sealed class CSClass
{
    public string Field1 = "F1";
}
"@
Add-Type -TypeDefinition $code
Write-Output "Get Field information from [CSClass].GetMembers() -> returns Field"
[CSClass].GetMembers() | ? { $_.Name -eq "Field1" } | select Membertype | Out-String

Write-Output "Get Field information from [CSClass] | Get-Members -> returns Property"
$t = [CSClass]::new()
$t | Get-Member | ? { $_.Name -eq "Field1" } | select Membertype | Out-String

PowerShell 5.1な環境での結果。

Get Field information from [PSClass].GetMembers() -> returns Property

MemberType
----------
  Property



Get Field information from [PSClass] | Get-Members -> returns Property

MemberType
----------
  Property



Get Field information from [CSClass].GetMembers() -> returns Field

MemberType
----------
     Field



Get Field information from [CSClass] | Get-Members -> returns Property

MemberType
----------
  Property