如何迭代ViewBag或如何将ViewBag的值从一个Action复制到另一个Action

Question

我有一个基本的控制器，如下所示

 public abstract class BaseController
    {

        protected ActionResult LogOn(LogOnViewModel viewModel)
        {
            SaveTestCookie();

            var returnUrl = "";
            if (HttpContext != null && HttpContext.Request != null && HttpContext.Request.UrlReferrer != null)
            {
                returnUrl = HttpContext.Request.UrlReferrer.LocalPath;
            }

            TempData["LogOnViewModel"] = viewModel;


            return RedirectToAction("ProceedLogOn", new { returnUrl });
        }

        public ActionResult ProceedLogOn(string returnUrl)
        {
            if (CookiesEnabled() == false)
            {
                return RedirectToAction("logon", "Account", new { area = "", returnUrl, actionType, cookiesEnabled = false });
            }
            var viewModel = TempData["LogOnViewModel"] as LogOnViewModel;

            if (viewModel == null)
            {
                throw new NullReferenceException("LogOnViewModel is not found in tempdata");
            }

            //Do something
            //the problem is I missed the values which are set in the ViewBag
        }
    }

和另一个控制器

public class MyController : BaseController
    {

        [HttpPost]
        public ActionResult LogOn(LogOnViewModel viewModel)
        {
            // base.LogOn is used in differnet controller so I saved some details in view bag 

            ViewBag.Action = "LogonFromToolbar";
            ViewBag.ExtraData = "extra data related only for this action";

            return base.LogOn(viewModel);
        }

    }

问题是我错过了ProceedLogOn动作方法中的视图包值。我在BaseController的Logon方法中具有值。

如何将ViewBag的值从一个动作复制到另一个动作？

所以我不能简单地说 this.ViewBag=ViewBag;

因为ViewBag没有设置程序。我当时在考虑通过视图袋进行迭代。我尝试过ViewBag.GetType().GetFields()，ViewBag.GetType().GetProperties()但他们什么也没返回。

Answer 1

ViewData反映了ViewBag
您可以像这样迭代存储的值：

ViewBag.Message = "Welcome to ASP.NET MVC!";
ViewBag.Answer = 42;

foreach (KeyValuePair<string, object> item in ViewData)
{
    // if (item.Key = "Answer") ...
}

此链接也应该有用