I'm trying something new (to me) in using an abstract base class for my layout viewmodel.
The problem is that when I run the site as is, it throws a very cryptic (to me) exception. What does this exception mean, and what might I do to resolve it?
Layout
@model MyApp.Core.ViewModels.LayoutViewModel
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="width=device-width" />
    <title>@Model.Title</title>
</head>
<body>
    <div>
       @RenderBody()
    </div>
</body>
</html>
Index
@model MyApp.Core.ViewModels.Home.IndexViewModel;
@{
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h1>@Model.Body</h1>
LayoutViewModel
namespace MyApp.Core.ViewModels
{
    public abstract class LayoutViewModel
    {
        public string Title { get; set; }
    }
}
IndexViewModel
namespace MyApp.Core.ViewModels.Home
{
    public class IndexViewModel : LayoutViewModel
    {
        public string Body { get; set; }
    }
}
Controller
[HttpGet]
public ActionResult Index()
{
    var model = new IndexViewModel
        {
            Title = "Hello World",
            Body = "Hello World"
        };
    return View(model);
}
And the Exception
Compilation Error Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS1003: Syntax error, '>' expected
Source Error:
Line 27: Line 28: Line 29: public class _Page_Views_Home_Index_cshtml : System.Web.Mvc.WebViewPage<FutureStateMobile.Core.ViewModels.Home.IndexViewModel;> { Line 30: Line 31: #line hiddenSource File: c:\Users\Chase\AppData\Local\Temp\Temporary ASP.NET Files\root\b314e0d7\36f522db\App_Web_index.cshtml.a8d08dba.yr7oemfz.0.cs Line: 29
Compare and contrast:
Layout
@model MyApp.Core.ViewModels.LayoutViewModel
Index
@model MyApp.Core.ViewModels.Home.IndexViewModel;
Got it yet? Here's the answer:
one of them has a
;which shouldn't be there
I just add the line twice, and deleted... problem solved!
@model MyApp.Core.ViewModels.LayoutViewModel
@model MyApp.Core.ViewModels.Layout_OrOther_Model
Try to compile, you get an error (only one model blah, blah..) Delete one of them.
@model MyApp.Core.ViewModels.LayoutViewModel
Compile.
That works for me!
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