How to resolve Microsoft.AspNetCore.Mvc.Internal.ActionContext.GetNormalizedRouteValue in .Net Core 2.2

Question

Microsoft.AspNetCore.Mvc.Internal.ActionContext.GetNormalizedRouteValue() doesn't exist

I am implementing a custom Razor ViewEngine in .net Core 2.2.

MSDN states that the GetNormalizedRouteValue() method exists within Microsoft.AspNetCore.Mvc.Internal for .Net Core 2.2, but it looks like it doesn't exist when I compile or inspect the assembly.

My Code

My code context where I am using use it is context.GetNormalizedRouteValue(AREA_KEY)

public class CustomViewEngine : IViewEngine
{
 public ViewEngineResult FindView(ActionContext context, string viewName, bool isMainPage)
        {
            var controllerName = context.GetNormalizedRouteValue(CONTROLLER_KEY);
            var areaName = context.GetNormalizedRouteValue(AREA_KEY);

            var checkedLocations = new List<string>();
            foreach (var location in _options.ViewLocationFormats)
            {
                var view = string.Format(location, viewName, controllerName);
                if (File.Exists(view))
                {
                    return ViewEngineResult.Found("Default", new CustomView(view, _customViewRendering));
                }
                checkedLocations.Add(view);
            }

            return ViewEngineResult.NotFound(viewName, checkedLocations);
        }

Microsoft's API

When inspecting the Microsoft API, only the following method signatures appear to exist.

namespace Microsoft.AspNetCore.Mvc
{

    public class ActionContext
    {

        public ActionContext();

        public ActionContext(ActionContext actionContext);

        public ActionContext(HttpContext httpContext, RouteData routeData, ActionDescriptor actionDescriptor);

        public ActionContext(HttpContext httpContext, RouteData routeData, ActionDescriptor actionDescriptor, ModelStateDictionary modelState);

        public ActionDescriptor ActionDescriptor { get; set; }

        public HttpContext HttpContext { get; set; }

        public ModelStateDictionary ModelState { get; }

        public RouteData RouteData { get; set; }
    }
}

I've checked MSDN's documentation and it indicates it should exist.

Error

'ActionContext' does not contain a definition for 'GetNormalizedRouteValue' and no accessible extension method 'GetNormalizedRouteValue' accepting a first argument of type 'ActionContext' could be found (are you missing a using directive or an assembly reference?)

Answer 1

The GetNormalizedRouteValue() method is static and is defined on the Microsoft.AspNetCore.Mvc.Internal.NormalizedRouteValue type.

Try this instead:

var controllerName = NormalizedRouteValue.GetNormalizedRouteValue(context, CONTROLLER_KEY);

See MSDN

Answer 2

Yo need to do some changes in your code Make sure you are using

Microsoft.AspNetCore.Mvc.Razor

GetNormalizedRouteValue method is now public. So you can call RazorViewEngine.GetNormalizedRouteValue method

Replace following line

 var controllerName = context.GetNormalizedRouteValue(CONTROLLER_KEY);

Your method will be like this

 public ViewEngineResult FindView(ActionContext context, string viewName, bool isMainPage)
  {
   var controllerName = RazorViewEngine.GetNormalizedRouteValue(context, CONTROLLER_KEY);
   var areaName = RazorViewEngine.GetNormalizedRouteValue(context, AREA_KEY)             
                //your code
    }

Mircosoft API

namespace Microsoft.AspNetCore.Mvc.Razor
{

    public class RazorViewEngine : IRazorViewEngine, IViewEngine
    {
        public static readonly string ViewExtension;
        protected IMemoryCache ViewLookupCache { get; }
        public static string GetNormalizedRouteValue(ActionContext context, string key);
        public RazorPageResult FindPage(ActionContext context, string pageName);
        public ViewEngineResult FindView(ActionContext context, string viewName, bool isMainPage);
        public string GetAbsolutePath(string executingFilePath, string pagePath);
        public RazorPageResult GetPage(string executingFilePath, string pagePath);
        public ViewEngineResult GetView(string executingFilePath, string viewPath, bool isMainPage);
    }
}