--- title: "ASP.NET Core Fluent Interface Extensions - Muhammad Rehan Saeed" description: "Using the fluent interface style in with ASP.NET Core Fluent Interface Extension methods. Building on top of the work done by Khalid Abuhakmeh." canonical_url: "https://rehansaeed.com/asp-net-core-fluent-interface-extensions/" last_updated: "2016-06-26T00:00:00+00:00" meta: author: "Muhammad Rehan Saeed" keywords: "ASP.NET Core,.NET Boxed" "og:description": "Using the fluent interface style in with ASP.NET Core Fluent Interface Extension methods. Building on top of the work done by Khalid Abuhakmeh." "og:image": "https://rehansaeed.com/_og/s/o_8b0cc03727af6ea3.png" "og:image:alt": "ASP.NET Core Fluent Interface Extensions - Muhammad Rehan Saeed" "og:image:height": "630" "og:image:type": image/png "og:image:width": "1200" "og:title": "ASP.NET Core Fluent Interface Extensions" "twitter:image": "https://rehansaeed.com/_og/s/o_8b0cc03727af6ea3.png" "twitter:image:alt": "ASP.NET Core Fluent Interface Extensions - Muhammad Rehan Saeed" --- > Index of every page on this site: [llms.txt](https://rehansaeed.com/llms.txt) # [ASP.NET Core Fluent Interface Extensions](https://rehansaeed.com/asp-net-core-fluent-interface-extensions/) Posted 26 June 2016 - **2 min read** ![Fluent Interface-All-The-Things](https://rehansaeed.com/_ipx/f_webp&s_2560x1440/images/hero/Fluent-Interface-All-The-Things-1366x768.png) Last week [Khalid Abuhakmeh](http://khalidabuhakmeh.com) wrote a very interesting blog post called [Middleware Builder for ASP.NET Core](http://www.khalidabuhakmeh.com/middlewarebuilder-for-asp-net-core-1-0-rc2#disqus_thread) which I highly recommend you read. In it, he attempts to write some extension methods to help with writing the Configure method in your ASP.NET Core Startup class with a [fluent interface](https://en.wikipedia.org/wiki/Fluent_interface). I've taken his blog post to heart and gone on a mission to 'fluent all the things' in ASP.NET Core. # IApplicationBuilder and ILoggerFactory This is an example of what your current Configure method might look like in a typical ASP.NET Core `Startup` class: ```cs public void Configure( IApplicationBuilder application, IHostingEnvironment environment, ILoggerFactory loggerFactory) { if (environment.IsDevelopment()) { // Do stuff on your local machine. loggerFactory .AddConsole(...) .AddDebug(); application.UseDeveloperExceptionPage(); } else { // Do stuff on when running in your production environment. loggerFactory.AddSerilog(...); application.UseStatusCodePagesWithReExecute("/error/{0}/"); } if (environment.IsStaging()) { // Do stuff in the staging environment. application.UseStagingSpecificMiddleware(); } application .UseStaticFiles() .UseMvc(); } ``` And this is the same code using the shorter, and prettier fluent interface style: ```cs public void Configure( IApplicationBuilder application, IHostingEnvironment environment, ILoggerFactory loggerFactory) { loggerfactory .AddIfElse( hostingEnvironment.IsDevelopment(), x => x.AddConsole(...).AddDebug(), x => x.AddSerilog(...)); application .UseIfElse( environment.IsDevelopment(), x => x.UseDeveloperExceptionPage(), x => x.UseStatusCodePagesWithReExecute("/error/{0}/")) .UseIf( environment.IsStaging(), x => x.UseStagingSpecificMiddleware()) .UseStaticFiles() .UseMvc(); } ``` In the above code, you can see that I've added `UseIf` and `UseIfElse` extension methods to the `IApplicationBuilder` which lets us use the fluent interface. What you'll also notice is that `ILoggerFactory` also has `AddIf` and `AddIfElse` extension methods. # IConfigurationBuilder I didn't just stop there, I added similar `AddIf` and `AddIfElse` extension methods for `IConfigurationBuilder`: ```cs public Startup(IHostingEnvironment hostingEnvironment) { this.hostingEnvironment = hostingEnvironment; var configurationBuilder = new ConfigurationBuilder() .SetBasePath(hostingEnvironment.ContentRootPath) .AddJsonFile("config.json") .AddJsonFile($"config.{hostingEnvironment.EnvironmentName}.json", optional: true); if (hostingEnvironment.IsDevelopment()) { configurationBuilder.AddUserSecrets(); } this.configuration = configurationBuilder .AddEnvironmentVariables() .AddApplicationInsightsSettings(developerMode: !hostingEnvironment.IsProduction()) .Build(); } public Startup(IHostingEnvironment hostingEnvironment) { this.hostingEnvironment = hostingEnvironment; this.configuration = new ConfigurationBuilder() .SetBasePath(hostingEnvironment.ContentRootPath) .AddJsonFile("config.json") .AddJsonFile($"config.{hostingEnvironment.EnvironmentName}.json", optional: true) .AddIf( hostingEnvironment.IsDevelopment(), x => x.AddUserSecrets()) .AddEnvironmentVariables() .AddApplicationInsightsSettings(developerMode: !hostingEnvironment.IsProduction()) .Build(); } ``` # IServiceCollection As if that wasn't enough I also did the same with `IServiceCollection` with the same `AddIf` and `AddIfElse` extension methods. In my experience, these would be used less often but I've added them for completeness. # Fluent me up! You can get these extension methods and much more by installing the [Boxed.AspNetCore](https://www.nuget.org/packages/Boxed.AspNetCore) NuGet package or create a project using the [.NET Boxed](https://github.com/Dotnet-Boxed/Templates) project templates. Finally, if you are so inclined, you can also take a look at the code for these extension methods in the [.NET Boxed Framework](https://github.com/Dotnet-Boxed/Framework) project. ## Web Mentions [What's this?](https://en.wikipedia.org/wiki/Webmention) ### 0 Linked ### 0 Replies ## GitHub Comments ### 3 Comments [Comment on GitHub](https://github.com/RehanSaeed/rehansaeed.github.io/issues/54) [![RehanSaeed](https://avatars.githubusercontent.com/u/2270364?v=4)](https://github.com/RehanSaeed "RehanSaeed") ### [RehanSaeed](https://github.com/RehanSaeed) Owner 12 May 2020 [![Yves Schelpe](https://camo.githubusercontent.com/d498d500ff2c6bac4bd5b8d973368cb67a9147c68f5a8bbe979811109695e0c6/68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f35316239623362633033303834643532626633613034366162653531376637373f733d393626643d6d6d26723d67)](https://camo.githubusercontent.com/d498d500ff2c6bac4bd5b8d973368cb67a9147c68f5a8bbe979811109695e0c6/68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f35316239623362633033303834643532626633613034366162653531376637373f733d393626643d6d6d26723d67) **Yves Schelpe** commented on **2016-09-22 08:28:09** Very cool! Links are broken to github :( [![RehanSaeed](https://avatars.githubusercontent.com/u/2270364?v=4)](https://github.com/RehanSaeed "RehanSaeed") ### [RehanSaeed](https://github.com/RehanSaeed) Owner 12 May 2020 [![Yves Schelpe](https://camo.githubusercontent.com/d498d500ff2c6bac4bd5b8d973368cb67a9147c68f5a8bbe979811109695e0c6/68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f35316239623362633033303834643532626633613034366162653531376637373f733d393626643d6d6d26723d67)](https://camo.githubusercontent.com/d498d500ff2c6bac4bd5b8d973368cb67a9147c68f5a8bbe979811109695e0c6/68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f35316239623362633033303834643532626633613034366162653531376637373f733d393626643d6d6d26723d67) **Yves Schelpe** commented on **2016-09-22 08:29:48** I see they now live [here](https://github.com/Dotnet-Boxed/Templates). [![RehanSaeed](https://avatars.githubusercontent.com/u/2270364?v=4)](https://github.com/RehanSaeed "RehanSaeed") ### [RehanSaeed](https://github.com/RehanSaeed) Owner 12 May 2020 [![Muhammad Rehan Saeed](https://camo.githubusercontent.com/8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca/68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67)](https://camo.githubusercontent.com/8a07049df41b8a3839a3f4342f09ea8e6e7fa0065667687f04beca2d088a1dca/68747470733a2f2f7777772e67726176617461722e636f6d2f6176617461722f32623266393030653361633066353535316462646537323864336262343935343f733d393626643d6d6d26723d67) **[Muhammad Rehan Saeed](https://rehansaeed.com/)** commented on **2016-09-22 09:57:58** > I see they now live [here](https://github.com/Dotnet-Boxed/Templates). Thanks, fixed. ```json {"@context":"https://schema.org","@graph":[{"@id":"https://rehansaeed.com/#website","@type":"WebSite","description":"Software Developer at Microsoft, YouTuber, Open Source Contributor and Blogger","inLanguage":"en-GB","name":"Muhammad Rehan Saeed","url":"https://rehansaeed.com/","author":{"@id":"https://rehansaeed.com/#identity"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://rehansaeed.com/?search={search_term_string}"},"query-input":"required name=search_term_string"}],"publisher":{"@id":"https://rehansaeed.com/#publisher"}},{"@id":"https://rehansaeed.com/asp-net-core-fluent-interface-extensions/#webpage","@type":"WebPage","dateModified":"2016-06-26T00:00:00+00:00","datePublished":"2016-06-26T00:00:00+00:00","description":"Using the fluent interface style in with ASP.NET Core Fluent Interface Extension methods. 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