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   源码介绍

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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);
        }
    }
}