How do I use sessions in ASP.NET Core?

In ASP.NET Core, sessions provide a way to store and retrieve user-specific information across multiple requests. Sessions can be used to persist data, such as user preferences or authentication details, throughout a user's interaction with your application. Here's a basic guide on how to use sessions in ASP.NET Core: Configure Session in Startup.cs: In the Startup.cs file, you need to configure the session services. This involves adding the session middleware and specifying the session storage mechanism. For example, you can use in-memory storage during development: csharp // Inside the ConfigureServices method public void ConfigureServices(IServiceCollection services) { services.AddDistributedMemoryCache(); // In-memory storage for development services.AddSession(options => { options.IdleTimeout = TimeSpan.FromMinutes(30); // Set the session timeout options.Cookie.HttpOnly = true; options.Cookie.IsEssential = true; }); // Other service configurations... } Use Sessions in Controllers or Views: Once the session is configured, you can access it in your controllers or views. Sessions can be accessed through the HttpContext.Session property. csharp // In a controller action method public IActionResult SetSession() { HttpContext.Session.SetString("UserName", "JohnDoe"); return RedirectToAction("Index"); } public IActionResult GetSession() { string userName = HttpContext.Session.GetString("UserName"); // Do something with the user name... return View(); } Accessing Sessions in Razor Views: You can also access sessions directly in your Razor views: csharp <!-- In a Razor view --> @{ string userName = Context.Session.GetString("UserName"); } <p>Welcome, @userName!</p> Enabling Session State in the Startup.cs Configure method: Finally, you need to add the session middleware to the request processing pipeline in the Configure method of Startup.cs: csharp // Inside the Configure method public void Configure(IApplicationBuilder app, IWebHostEnvironment env) { // Other middleware configurations... app.UseSession(); // More middleware configurations... } With these steps, you should be able to use sessions in your ASP.NET Core application. Keep in mind that in a production environment, you might want to use a more robust session storage provider, such as a distributed cache, to handle scenarios where your application is deployed across multiple servers. read less