How to use New-Object of a class present in a C# DLL using PowerShell

Question

I have a class in C# say for example

public class MyComputer : PSObject
{
    public string UserName
    {
        get { return userName; }
        set { userName = value; }
    }
    private string userName;

    public string DeviceName
    {
        get { return deviceName; }
        set { deviceName = value; }
    }
    public string deviceName;
}

which is derived from PSObject. I am loading the DLL having this code in powershell using import-module. Then I tried to create a new object of the MyComputer class in PowerShell.

PS C:> $MyCompObj = New-Object MyComputer

but it throws an error saying make sure assembly containing this type is loaded. Note: I am able to call Cmdlets successfully which is present in the DLL.

I am not sure is this the right way to go ahead on creating a new object. Please correct to me make this work.

Answer 1

First, make sure the assembly is loaded using

[System.Reflection.Assembly]::LoadFrom("C:\path-to\my\assembly.dll")

Next, use the fully qualified class name

$MyCompObj = New-Object My.Assembly.MyComputer

Answer 2

You don't need to have PSObject as base. Simply declare class without base.

Add-Type -typedef @"
public class MyComputer
{
    public string UserName
    {
        get { return _userName; }
        set { _userName = value; }
    }
    string _userName;

    public string DeviceName
    {
        get { return _deviceName; }
        set { _deviceName = value; }
    }
    string _deviceName;
}
"@

New-Object MyComputer | fl *

Later when you will work with the object, PowerShell will automatically wrap it into PsObject instance.

[3]: $a = New-Object MyComputer
[4]: $a -is [psobject]
True