在ActionFilterAttribute.OnActionExecuted中设置布局是有问题的

Question

I'm trying to set the layout path in a custom ActionFilterAttribute I have written as follow:

public class LayoutInjecterAttribute : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);
        var result = filterContext.Result as ViewResult;
        if (result != null)
        {
            result.MasterName = "~/Views/Layouts/Test.cshtml"
        }
    }
}

In here Test.cshtml is precompiled view (with the help of RazorGenerator ) in a different project.

But it gives me the error:

The view 'Index' or its master was not found or no view engine supports the searched locations. The following locations were searched: ~/Views/Home/Index.cshtml ~/Views/Shared/Index.cshtml ~/Views/Home/Index.aspx ~/Views/Home/Index.ascx ~/Views/Shared/Index.aspx ~/Views/Shared/Index.ascx ~/Views/Layouts/Test.cshtml

and controller actually is simple:

[LayoutInjecter]
public class HomeController : Controller
{
    public ActionResult Index()
    {
       return View();
    }
}

Answer 1

The error shows that LayoutInjecter is working fine. You said:

In here Test.cshtml is precompiled view in a different project.

But , Using razor views from a different (from outside the web project) is not supported out of the box. However there's a tool to precompile razor views and then you can put them in any DLL which called RazorGenerator . The compiler can't find the specified master layout file and shows this error.

For more information look at

• Precompiled Razor View Using RazorGenerator MVC and PreCompiledViewEngine in MVC 4 .
• Compile your asp.net mvc Razor views into a seperate dll

Edit: How did the PrecompiledMvcViewEngine know which view to render?

PrecompiledMvcViewEngine still relies on the ASP.NET MVC Views folder convention , using relative file paths to locate the views. However, this is slightly misleading. The PrecompiledMvcViewEngine doesn't look at physical files ; it looks for the System.Web.WebPages.PageVirtualPathAttribute that the Razor Single File Generator adds to every view that it generates that includes the view's relative file path.

Edit 2: I believe the guidance for your problem would be found in GitHub .

Answer 2

It works. Make sure the layout path "~/Views/Layouts/Test.cshtml" is correct.

Also, make sure that "Test.cshtml" is a layout page, and not a view / partial view.

Answer 3

Change result.MasterName = "~/Views/Layouts/Test.cshtml" to result.MasterName ="~/Views/Shared/Test.cshtml" . The Framework by convention looks in the ~/Views/Shared/ directory in your asp.net mvc solution for your layout pages. It appears to me you are dynamically or at runtime selecting a master page.