ProxySample/DynamicHttpConsole/DynamicHttpProxy.cs

DynamicHttpProxy.cs

using System;
using System.Collections.Generic;
using System.Dynamic;
using System.Linq;

namespace DynamicHttpConsole
{
    public class DynamicHttpProxy : DynamicObject
    {
        public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
        {
            if (binder.Name == "Get")
            {
                result = Get(binder.CallInfo.ArgumentNames, args);
                return true;
            }

            return base.TryInvokeMember(binder, args, out result);
        }

        static string Get(ICollection<string> argNames, object[] args)
        {
            var query = argNames
                .Zip(args.Skip(1), (n, v) => new { n, v })
                .ToDictionary(_ => _.n, _ => _.v);
            return HttpHelper.Get((string)args[0], query);
        }

        public string Get(string uri, object query = null) => HttpHelper.Get(uri, query);
    }
}

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace DynamicHttpConsole
{
    class Program
    {
        // http://zip.cgis.biz/
        const string Uri_Cgis_Xml = "http://zip.cgis.biz/xml/zip.php";

        static void Main(string[] args)
        {
            dynamic http = new DynamicHttpProxy();

            // No query
            Console.WriteLine(http.Get(Uri_Cgis_Xml));
            
            // Named arguments
            Console.WriteLine(http.Get(Uri_Cgis_Xml, zn: "1510052"));
            Console.WriteLine(http.Get(Uri_Cgis_Xml, zn: "402", ver: 1));
        }
    }
}