extract action input parameters from model in .net using reflction

I have this controller

public class AccountController : BaseController
    {
        [HttpPost]
        [AllowAnonymous]
        public async Task<ActionResult> Authenticate(LoginUser model)
        {
        }
  }

And here is my input model

public class LoginUser
{
    public string UserName { get; set; }
    public string Password { get; set; }
    public string CaptchaCode { get; set; }
}

I want to use reflection to extract data .The example of data that I need this output

**Account:Authenticate:UserName ,Password ,CaptchaCode** 

I find a code as you can see here :

 Assembly asm = Assembly.GetAssembly(typeof(Club.Web.MvcApplication));

            var controlleractionlist = asm.GetTypes()
                    .Where(type => typeof(System.Web.Mvc.Controller).IsAssignableFrom(type))
                    .SelectMany(type => type.GetMethods(BindingFlags.Instance | BindingFlags.DeclaredOnly | BindingFlags.Public))
                    .Where(m => !m.GetCustomAttributes(typeof(System.Runtime.CompilerServices.CompilerGeneratedAttribute), true).Any())
                    .Select(x => new { Controller = x.DeclaringType.Name, input = String.Join(",", x.GetParameters().Select(a => a.Name+"|"+a.ParameterType).ToArray()), Action = x.Name, ReturnType = x.ReturnType.Name, Attributes = String.Join(",", x.GetCustomAttributes().Select(a => a.GetType().Name.Replace("Attribute", ""))) })
                    .OrderBy(x => x.Controller).ThenBy(x => x.Action).ToList();

But it returns

**Account:Authenticate:LoginUser** 

But I need the item of my class