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I want to provide a simple general functionality to show a message at the top of a page whenever I need to inform a user that operation is successful.
My solution would be to put an object into ViewBag.Info that contains details about a message, including bool public IsMessage;and read it in _Layout.cshtml where I have an extra hidden div.
The way I am trying to do it in _Layout.cshtml is I put what's in @(ViewBag.Info.IsMessage (false/true) into a hidden field and read it by JavaScript. If the field contains "true", javascript will invoke a function ShowEvent().
For some reason, if I add the line @(ViewBag.Info.IsMessage.ToString().ToLower()) VS2010 complains about ViewBag.Title in _Layout.cshtml.
"Cannot perform runtime binding on a null reference"
The code of _Layout.cshtml is simple:
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<link rel="Stylesheet" type="text/css" href="@Url.Content("~/Content/StyleSheet.css")" />
<script src="~/Scripts/jquery-2.1.1.min.js" type="text/javascript"></script>
<title>@ViewBag.Title</title>
</head>
<body>
<input type="hidden" id="is-event" name="is-event" value="@(ViewBag.Info.IsMessage.ToString().ToLower())"/>
<div class="recent-events"></div>
<div>
@if (IsSectionDefined("loginfo"))
{
@RenderSection("loginfo", false)
}
@RenderBody()
@if (IsSectionDefined("Home"))
{
@RenderSection("Home", false)
}
</div>
</body>
</html>
And the code of the View Index.cshtml is:
@model TestProject.ViewModels.Account.UserData
@{
ViewBag.Title = "Index";
string identityName = HttpContext.Current.User.Identity.Name;
string userrole = Model.UserRoles.FirstOrDefault();
}
<h2>Index</h2>
<br />
As you can see ViewBag.Title is defined.
EDIT. The code of the controller:
public ActionResult Index()
{
// ...
InfoModel infoModel = new InfoModel()
{
IsMessage = true, Duration = 3000, Message = "Logging in successfull", BackgroundColor = "#bbffbb"
};
ViewBag.Info = infoModel;
ViewBag.Title = string.Empty;
return View(userdata);
}
559
You can get this issue if you attempt to reference a Model from a View which isn't strongly typed. For instance, typing
@Model.ID
somewhere in the page will attempt to bind to the ID property of the ViewModel - if you haven't defined the model type at the top of the View page with
@model MyModel
then it will bomb out with this obscure error message.
85
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