CODEWITHSUNDEEP
asp.net-mvc
dcarneiro
dcarneiro

Reputation: 7190

global variable in asp-net mvc views

In my web application I placed the menu on a partial view and load it from the Site.Master.

Now imagine a gmail like scenario where on your menu you'll have an Inbox(n) item where n is the number of unreaded mails. Is there a clean way to pass the n variable to all of the views that use the Site.Master masterpage?

Something like:

<%: Html.ActionLink("Inbox - " + ViewData["n"], "Index", "Home") %>

Upvotes: 6

Views: 11226

Answers (4)

S&#248;ren
S&#248;ren

Reputation: 6797

just define Global objects in _ViewStart.cshtml (views root folder), and use them all around views in project ;)

Upvotes: 1

Francisco Noriega
Francisco Noriega

Reputation: 14614

You should be able to do it the way you did in the example, just tell it to make the value a string, since view data returns objects, just unbox the number as a string and then you could use it just like that

<%: Html.ActionLink("Inbox - " +ViewData["n"].ToString(), "Index", "Home") %>

Upvotes: 0

Darin Dimitrov
Darin Dimitrov

Reputation: 1039508

You could use child actions along with the Html.Action and Html.RenderAction helpers. So let's elaborate with an example.

As always you start with a view model that will represent the information you want to show on this particular view (or in this case partial view):

public class InboxViewModel
{
    public int NumberOfUnreadMails { get; set; }
}

then a controller:

public class InboxController : Controller
{
    public ActionResult Index()
    {
        InboxViewModel model = ... // Repository, DI into the controller, ...
        return View(model);
    }
}

then a corresponding view (~/Views/Inbox/Index.ascx):

<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %>
<%: Html.ActionLink("Inbox - " + Model.NumberOfUnreadMails, "Index", "Home") %>

and finally embed this in your master page so that it is available on all views:

<div class="leftMenu">
    <% Html.RenderAction("Index", "Inbox"); %>
</div>

Upvotes: 4

p.campbell
p.campbell

Reputation: 100657

Consider keeping this in ViewData[]. This is how you can easily share data between different (partial) views.

Controller:

ViewData["UnreadMessages"] = "5";

All views can simply access this property.

Upvotes: 0

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