Dynamic JS And CSS in C#

And from here, select MVC project (you can select the project as per your requirement).

Now, go to the .cs file where you want to create the extension method to append the versions. I’m creating a Helper class in which the below code will be added.

Note

The class must be static and publicly accessible.

Here, we will create an HtmlHelper extension method which we can use anywhere in the project. Copy the below code and put it in your .cs file.

private static string GetVersion(this HtmlHelper helper, string filename)  
        {  
            var context = helper.ViewContext.RequestContext.HttpContext;  
  
            if (context.Cache[filename] == null)  
            {  
                var physicalPath = context.Server.MapPath(filename);  
                var version = $"?v={new System.IO.FileInfo(physicalPath).LastWriteTime.ToString("MMddHHmmss")}";  
                context.Cache.Add(filename, version, null,  
                  DateTime.Now.AddMinutes(5), TimeSpan.Zero,  
                  CacheItemPriority.Normal, null);  
                return version;  
            }  
            else  
            {  
                return context.Cache[filename] as string;  
            }  
        }  
  
        public static MvcHtmlString IncludeVersionedJs(this HtmlHelper helper, string filename)  
        {  
            string version = GetVersion(helper, filename);  
            return MvcHtmlString.Create("<script type='text/javascript' src='" + filename + version + "'></script>");  
        }

And that’s it. We have created the extension method which we are going to use in View to append dynamic versioning.

Step 5

Go to the .cshtml file (your View) and add the below line.

@Html.IncludeVersionedJs("/Scripts/bootstrap.js")

using System;  
using System.Collections.Generic;  
using System.Linq;  
using System.Web;  
using System.Web.Caching;  
using System.Web.Mvc;  
  
namespace DynamicVersion  
{  
    public static class Helper  
    {  
        private static string GetVersion(this HtmlHelper helper, string filename)  
        {  
            var context = helper.ViewContext.RequestContext.HttpContext;  
  
            if (context.Cache[filename] == null)  
            {  
                var physicalPath = context.Server.MapPath(filename);  
                var version = $"?v={new System.IO.FileInfo(physicalPath).LastWriteTime.ToString("MMddHHmmss")}";  
                context.Cache.Add(filename, version, null,  
                  DateTime.Now.AddMinutes(5), TimeSpan.Zero,  
                  CacheItemPriority.Normal, null);  
                return version;  
            }  
            else  
            {  
                return context.Cache[filename] as string;  
            }  
        }  
  
        public static MvcHtmlString IncludeVersionedJs(this HtmlHelper helper, string filename)  
        {  
            string version = GetVersion(helper, filename);  
            return MvcHtmlString.Create("<script type='text/javascript' src='" + filename + version + "'></script>");  
        }  
    }  
}