My ASP project can't access classes from a NuGet package I created

Solution:

As mentioned by @Zhi Lv I had to clear the cache.

Instead of clearing the cache of all packages I choose to go manually to C:\Users\<username>\.nuget\packages\ and delete the folder containing my package (in this case the folder named: RazorClassLibraryTest).

Problem:

So I'm experimenting with creating NuGet packages and this one has a tag helper and an extension method for the IApplicationBuilder, I packed the package and put it in a local folder, added the folder to the packages sources then installed the package.

Package project structure:

TagHelperNuGet/├── wwwroot/│├── css/││└── style.cs│└── js/│└── script.js├── TagHelpers/│└── BtnTagHelper.cs└── Extensions/└── StaticFileExtension.cs

The tag helper get recognized (after adding @addTagHelper *, RazorClassLibraryTest ofc), but the extension method does not.

When I try importing the name space in my Program.cs file

using RazorClassLibraryTest.Extensions;

I get

The type or namespace name 'Extensions' does not exist in the namespace 'RazorClassLibraryTest' (are you missing an assembly reference?)

But when I do the same for the tag helper name space, it get imported with out any problems

using RazorClassLibraryTest.TagHelpers;

This is the code of both files:

AlertBtnTagHleper.cs

using Microsoft.AspNetCore.Razor.TagHelpers;namespace RazorClassLibraryTest.TagHelpers{    [HtmlTargetElement("alert-btn")]    public class AlertBtnTagHelper : TagHelper    {        [HtmlAttributeName("text")]        public string Text { get; set; } = "Show Alert";        [HtmlAttributeName("message")]        public string Message { get; set; } = "Hello World!";        public override void Process(TagHelperContext context, TagHelperOutput output)        {            output.TagName = "button";            output.Attributes.SetAttribute("type", "button");            output.Attributes.SetAttribute("class", "btn-alert");            output.Attributes.SetAttribute("onclick", $"showAlert('{Message}')");            output.Content.SetContent(Text);        }    }}

StaticFilesExtention.cs

using Microsoft.AspNetCore.Builder;using Microsoft.Extensions.Configuration;using System.Reflection;namespace RazorClassLibraryTest.Extensions{    public static class StaticFilesExtension    {        /// <summary>        /// Configures the application to serve static files from a specified staticFilesRoot path.        /// </summary>        /// <param name="app">The application builder.</param>        /// <param name="staticFilesRoot">The staticFilesRoot path to serve static files from. Defaults to <c>_content/RazorClassLibraryTest/</c>.</param>        /// <returns>The application builder.</returns>        public static IApplicationBuilder UseTagStatics(this IApplicationBuilder app, string? staticFilesRoot)        {            if (string.IsNullOrWhiteSpace(staticFilesRoot))                return app;            app.Use(async (context, next) =>            {                if (context.Request.Path.StartsWithSegments(staticFilesRoot))                {                    Assembly assembly = Assembly.GetAssembly(typeof(StaticFilesExtension))!;                    string? assemblyName = assembly.GetName().Name;                    if (string.IsNullOrWhiteSpace(assemblyName))                        throw new InvalidOperationException("The assembly name could not be determined.");                    string assetPath = context.Request.Path.Value[(staticFilesRoot.Length + 1)..];                    context.Request.Path = $"/_content/{assemblyName}/{assetPath}";                }                await next();            });            return app;        }        /// <summary>        /// Configures the application to serve static files from a path specified in the configuration.        /// </summary>        /// <param name="app">The application builder.</param>        /// <param name="configuration">The configuration to get the staticFilesRoot path from. Expects the value to be stored in "RazorTag.StaticFilesRoot".</param>        /// <returns>The application builder.</returns>        public static IApplicationBuilder UseTagStatics(this IApplicationBuilder app, IConfiguration configuration)        {            string? configStaticFilesRoot = configuration["RazorTag:StaticFilesRoot"];            if (string.IsNullOrWhiteSpace(configStaticFilesRoot))                return app;            return app.UseTagStatics(configStaticFilesRoot);        }    }}

Code review and improvement advices are welcome, and thank you.

Edit:

The Extensions are packaged but they still doesn't workImage of the package structure using DotPeek application

Edit2:

The code from .csproj

<Project Sdk="Microsoft.NET.Sdk.Razor"><PropertyGroup><TargetFramework>net8.0</TargetFramework><Nullable>enable</Nullable><ImplicitUsings>enable</ImplicitUsings><GeneratePackageOnBuild>True</GeneratePackageOnBuild></PropertyGroup><ItemGroup><PackageReference Include="Microsoft.AspNetCore.Components.Web" Version="8.0.11" /><PackageReference Include="Microsoft.AspNetCore.Http.Abstractions" Version="2.2.0" /><PackageReference Include="Microsoft.AspNetCore.Razor" Version="2.3.0" /><PackageReference Include="Microsoft.Extensions.Configuration.Abstractions" Version="2.2.0" /></ItemGroup></Project>