How do I specify different Layouts in the ASP.NET Core MVC

Question

I would like to have 2 separate Layouts in my application. Let say one is for the Public section of the website and the other is empty for some reasons we need.

Before Core I could do this to define a filter:

public class LayoutInjecterAttribute : ActionFilterAttribute {     private readonly string _masterName;     public LayoutInjecterAttribute(string masterName)     {         _masterName = masterName;     }      public override void OnActionExecuted(ActionExecutedContext filterContext)     {         base.OnActionExecuted(filterContext);         var result = filterContext.Result as ViewResult;         if (result != null)         {             result.MasterName = _masterName;         }     } 

}

Now the ViewResult do not have the MasterName property. Is it possible to do now, and not to use in the View the layout definition.

Answer 1

You can still do something very similar to your original approach, using ViewData to pass around the layout name (Although I would create it as a Result Filter):

public class ViewLayoutAttribute : ResultFilterAttribute {     private string layout;     public ViewLayoutAttribute(string layout)     {         this.layout = layout;     }      public override void OnResultExecuting(ResultExecutingContext context)     {         var viewResult = context.Result as ViewResult;         if (viewResult != null)         {             viewResult.ViewData["Layout"] = this.layout;         }     }         } 

Then in the _ViewStart.cshtml file:

@{     Layout = (string)ViewData["Layout"] ?? "_Layout"; } 

Finally, assuming you create a new layout like Views/Shared/_CleanLayout.cshtml, you can use that attribute on any controller or action:

[ViewLayout("_CleanLayout")] public IActionResult About() {     //... } 

Answer 2

This is how I am using multiple layouts in my ASP.NET core MVC application.

You can try like this-

In _ViewStart.cshtml specify default _Layout like this-

@{     Layout = "_Layout"; } 

If you want to set page specific layout then in that page.cshtml, you can assign other view like this-

@{     Layout = "~/Views/Shared/_Layout_2.cshtml";     ViewData["Title"] = "Page Title"; } 

See if this helps.