using System;

using System.Dynamic;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var args = "--Bar --Foo MyStuff".Split();

        var parsedArgs = ParseArgs(args);

        Console.WriteLine(parsedArgs.Foo); //Writes "MyStuff"

        Console.WriteLine(parsedArgs.Bar); //Writes true;

        Console.WriteLine(parsedArgs.NotDefined); //Throws run time exception.

    }

    public static dynamic ParseArgs(string[] args)

    {

        IDictionary<string,object> result = new ExpandoObject();

        //Very basic implementation

        for(int i = 0; i < args.Length; i++)

        {

            if(args[i].StartsWith("--"))

            {

                if(i+1 < args.Length && !args[i+1].StartsWith("--"))

                {

                    result.Add(args[i].Substring(2), args[i+1]);

                }

                else

                {

                    result.Add(args[i].Substring(2), true);

                }

            }

        }

        return result;

    }

}