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C# ASP.NET MVC Basics Adding a List Page Improving Navigation

Posted by zaki bhai
zaki bhai
163 Points

Error in Line 30 at => @if ( ‎ViewBag.ShowBackBar != null && ViewBag.ShowBackBar)

I got this error (I am using VS 2012)

alt text

Full Code of file

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>@ViewBag.Title - Comic Book Gallery</title>
    <link href="~/Content/site.css" rel="stylesheet" type="text/css" />
    <link href="~/Content/bootstrap.min.css" rel="stylesheet" type="text/css" />
    <script src="~/Scripts/modernizr-2.6.2.js"></script>
</head>
<body>
    <div class="navbar navbar-inverse navbar-fixed-top">
        <div class="container">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                @Html.ActionLink("Comic Book Gallery", "Index", "ComicBooks", new { area = "" }, new { @class = "navbar-brand" })
            </div>
            <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <!-- Add menu items here -->
                </ul>
            </div>
        </div>
    </div>

    @if ( ‎ViewBag.ShowBackBar != null && ViewBag.ShowBackBar) 
    {
        <div class="backbar">
            <div class="container">
                @Html.ActionLink("Return to list" , "Index", null , new { @class = "btn btn-default"})
                <!--<a class="btn btn-default" href="/">Return to List</a>-->
            </div>
        </div>

    }


    <div class="container body-content">
        @RenderBody()
        <hr />
        <footer>
            <p>&copy; @DateTime.Now.Year - Comic Book Gallery</p>
        </footer>
    </div>

    <script src="~/Scripts/jquery-1.10.2.min.js"></script>
    <script src="~/Scripts/bootstrap.min.js"></script>
</body>
</html>

2 Answers

James Churchill
STAFF
James Churchill
Treehouse Teacher
James Churchill
James Churchill
Treehouse Teacher

Zaki,

The code shown in the video is correct, but I was able to copy and paste your provided code in Visual Studio and reproduce your error. This is an odd error. There appears to be an invisible character in the line of code that's causing the problem. If I simply retype that line of code, it works fine.

Here's my updated version of the code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>@ViewBag.Title - Comic Book Gallery</title>
    <link href="~/Content/site.css" rel="stylesheet" type="text/css" />
    <link href="~/Content/bootstrap.min.css" rel="stylesheet" type="text/css" />
    <script src="~/Scripts/modernizr-2.6.2.js"></script>
</head>
<body>
    <div class="navbar navbar-inverse navbar-fixed-top">
        <div class="container">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                @Html.ActionLink("Comic Book Gallery", "Index", "ComicBooks", new { area = "" }, new { @class = "navbar-brand" })
            </div>
            <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <!-- Add menu items here -->
                </ul>
            </div>
        </div>
    </div>

    @if (ViewBag.ShowBackBar != null && ViewBag.ShowBackBar)
    {
        <div class="backbar">
            <div class="container">
                @Html.ActionLink("Return to list" , "Index", null , new { @class = "btn btn-default"})
                <!--<a class="btn btn-default" href="/">Return to List</a>-->
            </div>
        </div>
    }

    <div class="container body-content">
        @RenderBody()
        <hr />
        <footer>
            <p>&copy; @DateTime.Now.Year - Comic Book Gallery</p>
        </footer>
    </div>

    <script src="~/Scripts/jquery-1.10.2.min.js"></script>
    <script src="~/Scripts/bootstrap.min.js"></script>
</body>
</html>

Thanks ~James

emmuster
emmuster
1,533 Points
emmuster
emmuster
1,533 Points

I'm not sure if this is correct, but it seems like the second part of your if-clause is not functioning properly, it should be either one of these two:

if (ViewBag.ShowBackBar != null && ViewBag.ShowBackBar == SOMETHING ELSE)

if (ViewBag.ShowBackBar != null)

You are currently not comparing two things, so the conditional AND operator is redundant and will throw an error... I think

zaki bhai
zaki bhai
163 Points

The thing is that same code works fine in Instructor's Video

alt text

zaki bhai
zaki bhai
163 Points

If I write it like this, It still give me an error

Code

        </div>
    </div>

    @if ( ‎ViewBag.ShowBackBar != null)
    {
        <div class="backbar">

Output

Error Message ScreenShot

emmuster
emmuster
1,533 Points

Hmm, maybe try removing the space after this bracket? It probably is some kind of typo

( ‎ViewBag.ShowBackBar