ASP.NET MVC3接收参数小测试

public ActionResult Index(string arg)
{
    if (arg == null)
    {
        return Content("null");
    }
    else if (arg == "")
    {
        return Content("empty");
    }
    else
    {
        return Content(arg);
    }
}

public ActionResult Index(int? arg)
{
    if (arg == null)
    {
        return Content("null");
    }
    else
    {
        return Content(arg.ToString());
    }
}

public ActionResult Index(Test test)
{
    return Content(test.arg1 + "," + test.arg2);
}