MVC prevents F5 from refreshing repeated data submissions

The Controller code is as follows:

//        // GET: /Home/        [HttpGet, ImportModelStateFromTempData]        public ActionResult Register()        {            return View();        }        [HttpPost, ExportModelStateToTempData]        public ActionResult RegisterProcess(Models.RegisterModel registerModel)        {            if (ModelState.IsValid)            {                return RedirectToAction("RegisterSuccess");            }            return RedirectToAction("Register");        }        [HttpGet]        public ActionResult RegisterSuccess()        {            return View();        }

The above importmodelstatefromtempdata and exportmodelstatetotempdata are actionfilter

This is to solve the problem that redirect cannot save model verification errors.

The basic principle of implementation is to store model verification errors to tempdata through exportmodelstatetotempdata,

Import the verification error from tempdata through importmodelstatefromtempdata.

View code:

@using (Html.BeginForm("RegisterProcess", "Home")){    <fieldset>        <legend>Register</legend>        @Html.ValidationSummary(true)        <ol>            <li>                @Html.LabelFor(m => m.NickName)                @Html.TextBoxFor(m => m.NickName)                @Html.ValidationMessageFor(m => m.NickName)            </li>            <li>                @Html.LabelFor(m => m.Email)                @Html.TextBoxFor(m => m.Email)                @Html.ValidationMessageFor(m => m.Email)            </li>        </ol>        <input type="submit" value="Sumbit" />    </fieldset>}

The implementation code of importmodelstatefromtempdata and exportmodelstatetotempdata is as follows:

using System.Web.Mvc;namespace MVCFormValiation.Filters{    public abstract class ModelStateTempDataTransfer : ActionFilterAttribute    {        protected static readonly string Key = typeof(ModelStateTempDataTransfer).FullName;    }    public class ExportModelStateToTempData : ModelStateTempDataTransfer    {        public override void OnActionExecuted(ActionExecutedContext filterContext)        {            //Only export when ModelState is not valid            if (!filterContext.Controller.ViewData.ModelState.IsValid)            {                //Export if we are redirecting                if ((filterContext.Result is RedirectResult) || (filterContext.Result is RedirectToRouteResult))                {                    filterContext.Controller.TempData[Key] = filterContext.Controller.ViewData.ModelState;                }            }            base.OnActionExecuted(filterContext);        }    }    public class ImportModelStateFromTempData : ModelStateTempDataTransfer    {        public override void OnActionExecuted(ActionExecutedContext filterContext)        {            var modelState = filterContext.Controller.TempData[Key] as ModelStateDictionary;            if (modelState != null)            {                //Only Import if we are viewing                if (filterContext.Result is ViewResult)                {                    filterContext.Controller.ViewData.ModelState.Merge(modelState);                }                else                {                    //Otherwise remove it.                    filterContext.Controller.TempData.Remove(Key);                }            }            base.OnActionExecuted(filterContext);        }    }}