Can I create the variables and launch the methods of my classes in PowerShell hosted by me?

Question

PowerShell 4.0

I want to host PowerShell engine in my application and to have the capability of using API of my application in the hosted PowerShell. I read the description of the PowerShell class and its members in the documentation. In the PowerShell.exe and PowerShell_ISE.exe hosts I can to create the variables, loops, launch the static and instance methods of my classes. Can I do the same through the PowerShell class? I can't find the the examples about it.

It is my simple attempt to do it:

using System;
using System.Linq;
using System.Management.Automation;

namespace MyPowerShellApp {

    class User {
        public static string StaticHello() {
            return "Hello from the static method!";
        }
        public string InstanceHello() {
            return "Hello from the instance method!";
        }
    }

    class Program {
        static void Main(string[] args) {
            using (PowerShell ps = PowerShell.Create()) {
                ps.AddCommand("[MyPowerShellApp.User]::StaticHello");
                // TODO: here I get the CommandNotFoundException exception
                foreach (PSObject result in ps.Invoke()) {
                    Console.WriteLine(result.Members.First());
                }
            }
            Console.WriteLine("Press any key for exit...");
            Console.ReadKey();
        }
    }
}

Answer 1

There are two problems in your code:

1. You need to make User class public, to be visible to PowerShell.
2. You should use AddScript instead of AddCommand.

This code will call two methods of User class and print resulting strings to console:

using System;
using System.Management.Automation;

namespace MyPowerShellApp {

    public class User {
        public static string StaticHello() {
            return "Hello from the static method!";
        }
        public string InstanceHello() {
            return "Hello from the instance method!";
        }
    }

    class Program {
        static void Main(string[] args) {
            using (PowerShell ps = PowerShell.Create()) {
                ps.AddScript("[MyPowerShellApp.User]::StaticHello();(New-Object MyPowerShellApp.User).InstanceHello()");
                foreach (PSObject result in ps.Invoke()) {
                    Console.WriteLine(result);
                }
            }
            Console.WriteLine("Press any key for exit...");
            Console.ReadKey();
        }
    }
}