Custom Razor View Engine for C# and VB

Custom Razor View Engine for C# and VB

05 Mar 2024
Advanced
147K Views
3 min read

You should be happy to know, Asp.Net MVC is an open source and highly extensible framework. You can customize it according to your need. As you read my previous article Removing the Web Form View Engine for better performance of Razor View Engine from your Asp.Net MVC Razor application. In this article, you will learn how can you customize the Razor View engine for C# and VB language.

Removing All the View Engines & registering the Razor Engine

protected void Application_Start() 
{ 
 //Remove All View Engine including Webform and Razor
 ViewEngines.Engines.Clear();
 //Register Razor View Engine
 ViewEngines.Engines.Add(new RazorViewEngine());
 //Other code is removed for clarity
} 

After removing the Web Form and other View engine as you noticed that Razor View engine looks up the C# and VB views as shown below.

As you know MVC is highly extensible hence you can completely replace the Razor view engine with a new custom razor engine. by doing so, this will slightly improve your application performance. If your MVC application is using only C# language, there is no need to looks up the .vbhtml views and same for VB language.

Custom C# Razor View Engine

public class CSharpRazorViewEngine : RazorViewEngine
{
 public CSharpRazorViewEngine()
 {
 AreaViewLocationFormats = new[]
 {
 "~/Areas/{2}/Views/{1}/{0}.cshtml",
 "~/Areas/{2}/Views/Shared/{0}.cshtml"
 };
 AreaMasterLocationFormats = new[]
 {
 "~/Areas/{2}/Views/{1}/{0}.cshtml",
 "~/Areas/{2}/Views/Shared/{0}.cshtml"
 };
 AreaPartialViewLocationFormats = new[]
 {
 "~/Areas/{2}/Views/{1}/{0}.cshtml",
 "~/Areas/{2}/Views/Shared/{0}.cshtml"
 };
 ViewLocationFormats = new[]
 {
 "~/Views/{1}/{0}.cshtml",
 "~/Views/Shared/{0}.cshtml"
 };
 MasterLocationFormats = new[]
 {
 "~/Views/{1}/{0}.cshtml",
 "~/Views/Shared/{0}.cshtml"
 };
 PartialViewLocationFormats = new[]
 {
 "~/Views/{1}/{0}.cshtml",
 "~/Views/Shared/{0}.cshtml"
 };
 }
} 

Regisering the C# Razor View Engine

protected void Application_Start() 
{ 
 //Remove All View Engine including Webform and Razor
 ViewEngines.Engines.Clear();
 //Register C# Razor View Engine
 ViewEngines.Engines.Add(new CSharpRazorViewEngine());
 //Other code is removed for clarity
} 

Custom VB Razor View Engine

Imports System.Web.Mvc
Public Class VBRazorViewEngine Inherits RazorViewEngine
 Public Sub New()
 AreaViewLocationFormats = {
 "~/Areas/{2}/Views/{1}/{0}.vbhtml", 
 "~/Areas/{2}/Views/Shared/{0}.vbhtml"
 }
 AreaMasterLocationFormats = {
 "~/Areas/{2}/Views/{1}/{0}.vbhtml", 
 "~/Areas/{2}/Views/Shared/{0}.vbhtml"
 }
 AreaPartialViewLocationFormats = {
 "~/Areas/{2}/Views/{1}/{0}.vbhtml", 
 "~/Areas/{2}/Views/Shared/{0}.vbhtml"
 }
 ViewLocationFormats = {
 "~/Views/{1}/{0}.vbhtml", 
 "~/Views/Shared/{0}.vbhtml"
 }
 MasterLocationFormats = {
 "~/Views/{1}/{0}.vbhtml", 
 "~/Views/Shared/{0}.vbhtml"
 }
 PartialViewLocationFormats = {
 "~/Views/{1}/{0}.vbhtml", 
 "~/Views/Shared/{0}.vbhtml"
 }
 End Sub
End Class

Regisering the VB Razor View Engine

Sub Application_Start()

 ViewEngines.Engines.Clear();
 ViewEngines.Engines.Add(new VBRazorViewEngine());

End Sub

Note

  1. Use one of the approach when you are sure that you will use only either C# language or VB Language. It will be helpful to you.

  2. If you are using both type of views (cshtml and vbhtml), don't implement this.

What do you think?

I hope you will enjoy the tricks while programming with MVC Razor. I would like to have feedback from my blog readers. Your valuable feedback, question, or comments about this article are always welcome.

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About Author
Shailendra Chauhan (Microsoft MVP, Founder & CEO at Scholarhat by DotNetTricks)

Shailendra Chauhan is the Founder and CEO at ScholarHat by DotNetTricks which is a brand when it comes to e-Learning. He provides training and consultation over an array of technologies like Cloud, .NET, Angular, React, Node, Microservices, Containers and Mobile Apps development. He has been awarded Microsoft MVP 8th time in a row (2016-2023). He has changed many lives with his writings and unique training programs. He has a number of most sought-after books to his name which has helped job aspirants in cracking tough interviews with ease.
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