Question

这是控制器

public ActionResult Test() {

@ViewBag.TheMessageIs = "this is the message";
return RedirectToAction("Details", new { id = theId});

}

在名为详细信息的操作的视图上，我将检查是否有要显示和显示的ViewBag：

@{
  if(ViewBag.TheMessageIs != null){
         @ViewBag.TheMessageIs
  }
}

但是这里重定向对页面工作正常，它没有显示我在ViewBag中存储的消息.MessageIs

感谢

Answer 1

基本上你正在做的是从Details方法调用方法Index，因为你已经用id重载了你的详细信息操作，所以也要传递消息：

public ActionResult Index()
{
    //ViewBag.TheMessageIs = "this is the message";
    return RedirectToAction("Details", new { id = 1, TheMessageIs = "this is the message" });
}

public ActionResult Details(int id, string TheMessageIs)
{
    ViewBag.TheMessageIs = TheMessageIs;
    return View();
}

然后在“详细信息”视图中，您可以像这样访问该属性：

@ViewBag.TheMessageIs

Answer 2

public ActionResult Test() {
 TempData["shortMessage"] = "MyMessage";
 return RedirectToAction("Details", new { id = theId});
}

public ActionResult Details {
 //now I can populate my ViewBag (if I want to) with the TempData["shortMessage"] content
  ViewBag.TheMessageIs = TempData["shortMessage"].ToString();
  return View();
}

你必须这样做，因为当你重定向到另一个活动/视图时，viewbag会丢失它的值

MVC 5 asp.net，从控制器到视图的viewbag无法正常工作

2 个答案: