Middlewares in C#

Question

How to add a custom middleware in C#?

Madhu Patel · Answer

You can read this article: https://www.c-sharpcorner.com/article/create-a-custom-middleware-in-an-asp-net-core-application/

Sandhiya Priya · Answer

What is Middleware in ASP.NET Core? Middleware is a piece of code that processes HTTP requests and responses in a pipeline. Each middleware can: Do something before and/or after the next middleware runs. Either pass the request along or stop it. In short: Middleware = A request handler that sits in the HTTP pipeline. Steps to Create and Add Custom Middleware 1. Create a Custom Middleware Class using Microsoft.AspNetCore.Http; using System.Threading.Tasks; public class MyCustomMiddleware { private readonly RequestDelegate _next; public MyCustomMiddleware(RequestDelegate next) { _next = next; } public async Task InvokeAsync(HttpContext context) { // Code before next middleware Console.WriteLine(" Request incoming: " + context.Request.Path); // Call the next middleware in the pipeline await _next(context); // Code after next middleware Console.WriteLine(" Response outgoing: " + context.Response.StatusCode); } } 2. Create an Extension Method (optional but recommended) using Microsoft.AspNetCore.Builder; public static class MyCustomMiddlewareExtensions { public static IApplicationBuilder UseMyCustomMiddleware(this IApplicationBuilder builder) { return builder.UseMiddleware (); } } 3. Register Middleware in Program.cs or Startup.cs For .NET 6 / .NET 7 / .NET 8 var builder = WebApplication.CreateBuilder(args); var app = builder.Build(); app.UseMyCustomMiddleware(); // Custom middleware added here app.MapControllers(); app.Run(); For older versions (Startup.cs) public void Configure(IApplicationBuilder app, IHostingEnvironment env) { app.UseMyCustomMiddleware(); app.UseMvc(); } 4. Run the Application When you send a request (e.g., to an API endpoint), you’ll see logs like: Request incoming: /api/values Response outgoing: 200 Why Use Custom Middleware? Logging or request tracking, Authentication / Authorization , Exception handling , Request/Response modification ,Performance monitoring Summary Step Description 1 Create a middleware class with InvokeAsync(HttpContext) 2 (Optional) Add an extension method for clean code 3 Register it in Program.cs using app.UseMyCustomMiddleware() In Short : Custom Middleware = Your own code logic that runs in the ASP.NET Core request pipeline before or after the main app logic.

Middlewares in C#

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