dotNET21 posts

Having fast API response is crucial for your applications. In this article you'll see how I managed to improve an API application that took 14 secs each call.

With HttpRepl you can perform HTTP operations as they were local folders, using the CLI. Let's see how to configure it and run GET and POST operations.

Swagger is a tool that exposes the documentation of your APIs and helps collaborating with other teams. We'll see how to integrate it with .NET Core 3, how to add XML comments and status codes.

Integration tests are useful to check if multiple components fit together well. How can you test your APIs? And how can you mock dependencies?

Sometimes on your tests you need to access test files, for example for mocking external data. With manifest resources you can easily reference files for your tests.

BenchmarkDotNet allows you to test the performance on .NET methods. So let's answer a question: is the Enum.HasFlag method really that slow?

Validating inputs is crucial for every application. If you want an easy and versatile way, you can try FluentValidation.

Internal members can be accessed only within the same assembly. And for different assemblies? Here's for you the InternalsVisibleTo attribute!

Singleton, Scoped and Transient: these are the possible lifetimes for DI with .NET Core. How do they change the way objects are constructed?

Having a robust logging system is crucial for any application. There are many tools, and one of these is Serilog. Here you'll learn how to use it in a .NET application and how to integrate it with Seq.

Do you have an Azure Function that you want to upgrade from v2 to v3? Don't panic, it's just a matter of few steps!

Azure Functions are one of the best examples of serverless applications. By default you can't use Dependency injection: here's how you can configure it by adding the Startup class.

Asynchronous programming is often seen as something cumbersome, so many developers avoid it. What, why and how to use it? Here are the first steps you can take to approach async programming.

We have already seen how to search for videos in a YouTube channel. Now it's time to get details for a single video.

YouTube provides some APIs for getting info about a channel videos. But they also provide .NET libraries to achieve the same result with C#. Let's have a try!

Extension methods in C# are really useful, but there are few rules to follow...

More than 50% of mobile users abandon a website if it takes more than 3 seconds to load. Here you'll learn few trick to improve your site performance.

On November I shared on Twitter an article each day. They were about C#, general programming and advanced topics. For celebrating the conclusion of this challenge, I wrote a poem about that.

Is it true that the inverse of a negative number is always a positive number? If you think it's true, you might get a subtle error while implementing comparison.

Error CS0246 - Type or namespace could not be found. What does it mean? Why does it happen? How can you solve it?

Some of the things I learned at .NET Conf Italia: interfaces and abstract classes, Blazor, C# default interfaces and .NET Core on Samsung TV