Change Layout(Master Page) of view in ASP.NET MVC without recreate it

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星月不相逢 2021-01-31 08:08

I\'m using ASP.NET MVC 3 with Razor views. When you want to create a view you can choose a layout (master page) for your view, or leave it to choose Default (_Layout).

I

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  • 2021-01-31 08:19

    There are multiple ways to specify a different layout for a view, depending on your needs:

    In the View

    As mentioned in other answers, simply change the view's Layout property:

    @{
        Layout = "~/Views/Shared/_CustomLayout.cshtml";
    }
    

    In _ViewStart.cshtml

    MVC 3 added a default Views/_ViewStart.cshtml into which you can put logic which is shared by all views. You can also create additional _ViewStart.cshtml files in any Views subdirectory for additional custom logic (it will search up the hierarchy and in Shared folders, just like when finding any other view or partial).

    Putting a lot of business logic into this feels like a violation of the "separation of concerns" principle, but at the same time it can be very handy.

    Note that _ViewStart.cshtml inherits from StartPage, not WebPage, so its properties may be slightly different from what you're used to (e.g. you have to go through ViewContext to get the ViewBag).

    @{
        if (ViewContext.ViewBag.IsAdmin) // or other custom logic
        {
            Layout = "~/Views/Shared/_AdminLayout.cshtml";
        }
        else
        {
            Layout = "~/Views/Shared/_Layout.cshtml";
        }
    }
    

    In the Controller action

    The View() method has an overload which takes an explicit layout page (Intellisense refers to it as a "master page"):

        public ActionResult FooAction()
        {
            var model = new MyModel();
    
            return View("Index", "_CustomLayout", model);
        }
    
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  • 2021-01-31 08:26

    After creating your view in the top of cshtml file you can see your layout included.

    @{
        Layout = "~/Views/Shared/_Layout.cshtml";
    }
    

    You can simply replace that for example with different layout

    @{
        Layout = "~/Views/Shared/_Layout2.cshtml";
    }
    

    Also, you can store this in the base layout (_ViewStart.cshtml) and then all your views will use that layout.

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  • 2021-01-31 08:26

    We can change the default rendering of layouts with in _ViewStart file by using the below code:

    @{
     var controller = HttpContext.Current.Request.RequestContext.RouteData.Values["Controller"].ToString();
    
     string layout = "";
     if (controller == "Admin")
     {
     layout = "~/Views/Shared/_AdminLayout.cshtml";
     }
     else
     {
     layout = "~/Views/Shared/_Layout.cshtml";
     }
    
     Layout = layout;
    }
    
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  • 2021-01-31 08:28

    In MVC3 you have _ViewStart.cshtml that stores all pages' Layout; you can change this element to change all pages' Layout or you can add new Layout element in top of target view pages in @{} block like the following to change the layout of the specific page:

    @{
        Layout = "~/Views/Shared/_newLayout.cshtml";
        ViewBag.Title = "Index";
    }
    
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