Answer to closed SO question https://stackoverflow.com/questions/55203279/c-sharp-coding-assessment-need-help-understanding-specs?noredirect=1#comment97143784_55203279

Program.cs

// https://stackoverflow.com/questions/55203279/c-sharp-coding-assessment-need-help-understanding-specs
using System;

public interface INotification
{
	void Send(string message, object payLoad);
}

public class Email : INotification
{
	string _message { get; set; }
	object _payLoad { get; set; }

	public void Send(string message, object payLoad)
	{
		_message = message;
		_payLoad = payLoad;
		Console.WriteLine($"message \"{message}\" sent by {this.GetType()}");
	}
}

public class Fax : INotification
{
	string _message { get; set; }
	object _payLoad { get; set; }

	public void Send(string message, object payLoad)
	{
		_message = message;
		_payLoad = payLoad;
		Console.WriteLine($"message \"{message}\" sent by {this.GetType()}");
	}

}

public class Report : INotification
{
	string _message { get; set; }
	object _payLoad { get; set; }

	public void Send(string message, object payLoad)
	{
		_message = message;
		_payLoad = payLoad;
		Console.WriteLine($"message \"{message}\" sent by {this.GetType()}");
	}

}

// EDI GENERATOR
public class EdiGenerator
{

	public void Generate(string[] configurationData)
	{
		foreach (string notificatorType in configurationData)
		{
			// https://stackoverflow.com/questions/11107536/convert-string-to-type-in-c-sharp
			Type type = Type.GetType(notificatorType, true);
			INotification sender = (INotification)Activator.CreateInstance(type);
			sender.Send("this is message to send", new object());
		}
	}

}

public static class MainClass
{

	public static void Main(string[] args)
	{


		EdiGenerator generator = new EdiGenerator();
		//"Report, ConsoleApp3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
		//	"Fax, ConsoleApp3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",
		//	"EMail, ConsoleApp3, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null",

		// notificators should contains Type names of notificators
		string[] notificators = new string[]
		{
			"Report",
			"Fax",
			"Email",
		};

		generator.Generate(notificators);
	}


}

Thanks for the help, would there have been any way to do this without using Activator.CreateInstance() or is this dependency injection so it requires the use because type isn't known at compile time?

Depends on yours preferences. I was taken into account the parameters string[] configurationData, which does not allow many other solution.

But you can:

• Inject a factory to a generator for creating classes which are not known in time of compilation.
• Resolve a class from dependency container in generator. For example register all INotification instances in DI container and resolve all registered instances in generator. Depends of concrete DI container.