The best new features in ASP.NET Core 7

A major part of Microsoft’s “cloud-first” .NET 7 release in November, ASP.NET Core 7 brings powerful new tools to the web development framework to help developers create modern web applications. Built on top of the .NET Core runtime, ASP.NET Core 7 has everything you need to build cutting-edge web user interfaces and robust back-end services on Windows, Linux, and macOS alike.

This article discusses the biggest highlights in ASP.NET Core 7, and includes some code examples to get you started with the new features. To work with the code examples provided in this article, you should have Visual Studio 2022 installed in your computer. If you don’t have a copy, you can download Visual Studio 2022 here.

Now let’s dive into the best new features in ASP.NET Core 7.

Output caching middleware

ASP.NET Core 7 allows you to use output caching in all ASP.NET Core apps: Minimal API, MVC, Razor Pages, and Web API apps with controllers. To add the output caching middleware to the services collection, invoke the IServiceCollection.AddOutputCache extension method. To add the middleware to the request processing pipeline, call the IApplicationBuilder.UseOutputCache extension method.

Then, to add a caching layer to an endpoint, you can use the following code.

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();
app.MapGet("", () => "Hello World!").CacheOutput();

Rate-limiting middleware

Controlling the rate at which clients can make requests to endpoints is an important security measure that allows web applications to ward off malicious attacks. You can prevent denial-of-service attacks, for example, by limiting the number of requests coming from a single IP address in a given period of time. The term for this capability is rate limiting.

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