Csharp 将C#类导入到PowerShell

我正在试验C#和PowerShell.在PowerShell文件中创建一个C#类、实例化它并使用它非常简单，如下面的代码所示:

$code = @"
using System;
public abstract class Transporter : IDisposable
{
    public abstract void Transport(Order order);

    public void Dispose()
    {
        // Suppress finalization.
        GC.SuppressFinalize(this);
    }
}

public class Order {
    public int Distance { get; set; }
    public bool Urgent { get; set; }
}

public class SeawayTransporter : Transporter
{
    public override void Transport(Order order)
    {
        Console.WriteLine("The order transported by SeawayTransporter");
    }
}

public class AirwayTransporter : Transporter
{
    public override void Transport(Order order)
    {
        Console.WriteLine("The order transported by AirwayTransporter");
    }
}

public class HighwayTransporter : Transporter
{
    public override void Transport(Order order)
    {
        Console.WriteLine("The order transported by HighwayTransporter");
    }
}

"@
# use it!
Add-Type -TypeDefinition $code -Language CSharp 
$order = [Order]::new()
$order.Distance = 200
$order.Urgent=$false
$highway = [HighwayTransporter]::new()
$highway.Transport($order)

现在，我想将类定义导出到一个单独的文件，类似于PowerShell模块.然而，我遇到了一个挑战，因为我使用的是PowerShell不熟悉的抽象类定义.try 将类定义放在函数中并将其另存为模块(例如，myCSharpModule.psm1)，然后导入该模块似乎行不通.如何才能做到这一点？