c# - 隐藏来自 ASP.NET MVC 中的操作的路由值？

Question

我想根据请求来自的操作使用一个页面显示两个不同的文本，如果这个请求直接来自 Index，它会显示一些欢迎文本，如果它来自Create 表单显示一些其他文本:

public ActionResult Index(bool? ticketSent)
{
    if (ticketSent == true)
        ViewBag.IfcText = "done";
    else
        ViewBag.IfcText = "hello";
    return View();
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "TicketNumber,OwnerName,Email,LaptopModelNumber,Subject,Description,ComplainDate")] Ticket ticket)
{
    if (ModelState.IsValid)
    {
        db.Tickets.Add(ticket);
        db.SaveChanges();
        return RedirectToAction("Index", new { ticketSent = true });
    }

    return View(ticket);
}

但是当请求来自 Create 操作时，Url 包含查询字符串 http://localhost:54401/?ticketSent=True，因此如果用户刷新浏览器，甚至在他获得指示表单已成功发送的同一页面时导航到它，我想确保在他仅创建没有查询字符串的表单后显示它。

这是 View :

@{if (ViewBag.IfcText == "hello")
    {
        <h2>Encountering a problem? We are here to help</h2>
        <h3>
            @Html.ActionLink("Contact our Support Team", "Create")
        </h3>
    }
    else if (ViewBag.IfcText == "done")
    {
        @:<h2>We received it, we will be in contact with you in 24 hrs.</h2>
    }
}

Answer 1

使用 TempData 来存储标志。它只会在上一个请求的重定向中可用，这正是您想要的。

查看这篇文章以获得更好的理解

When to use ViewBag, ViewData, or TempData in ASP.NET MVC 3 applications

这个概念仍然适用于最近版本的 MVC

const string ticketSentKey = "ticketSent";

public ActionResult Index()
{
    var ticketSent = false;

    if(TempData.ContainsKey(ticketSentKey) && TempData[ticketSentKey] is bool) 
        ticketSent = (bool)TempData[ticketSentKey];

    if (ticketSent == true)
        ViewBag.IfcText = "done";
    else
        ViewBag.IfcText = "hello";
    return View();
}

[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include = "TicketNumber,OwnerName,Email,LaptopModelNumber,Subject,Description,ComplainDate")] Ticket ticket)
{
    if (ModelState.IsValid)
    {
        db.Tickets.Add(ticket);
        db.SaveChanges();
        TempData[ticketSentKey] = true;
        return RedirectToAction("Index");
    }

    return View(ticket);
}