About

Blog on development in general, and specifically on .NET, since 2024 (original blog is here since 2009). Created and maintained by Ricardo Peres.

I am a software developer from Coimbra, Portugal, where I graduated in Informatics Engineering from DEI-UC. Currently doing an PhD in Informatics Engineering also at DEI-UC, where I'm researching AI code generation using multi-agents.

I am currently a Founding Team Lead at Evolve Software Portugal and was awarded as Microsoft Most Valuable Professional (MVP) from 2015-19 and from 2024 again.

I also wrote a few books, reviewed others, and maintain some open source software.

Always happy to get feedback and comments, either agreeing with what I say or otherwise!

Popular posts from this blog

Modern Mapping with EF Core

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Introduction In EF Core (as in most O/RMs) we can map and store multiple things: Objects that hold a single value, like int , string , bool , float , Guid , DateTime , TimeSpan , Uri , etc. These are (somewhat wrongly) called primitive types  and are always included inside some container, like the following Objects that hold multiple single values and which have an identity, for example, Customer , Product , Order . These are called entity types  and they must have an identity that makes them unique amongst all the other objects of the same type Objects that are structured to hold multiple values, but have no identity, such as Address , Coordinate . These are called value types  and are merely a collection of (possibly related) properties We can also have collections of the previous things There's more to it, of course, for example, it is even possible to represent  inheritance of entities , of which I talked about before , In this post I am going to cover so...
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C# Magical Syntax

Introduction This post is an update to an old one on my  old blog  and it was inspired by my latest posts on C# versus Java . You may not have realized that some of the patterns that you’ve been using for ages in your C# programs are based on conventions, rather than on a specific API. What I mean by this is, some constructs in C# are based on some magical methods with well-defined names which are not defined in any base class or interface, but yet just work. Let’s see what they are. Enumerating Collections You are probably used to iterating through collections using the foreach statement. If you are, you may know that foreach actually wraps a call to a method called GetEnumerator , like the one that is defined by the IEnumerable and IEnumerable<T> interfaces. Thus, you might think, the magic occurs because the collection implements one or the two, but you would be wrong: it turns out that in order to iterate through a class using foreach all it takes is that the c...
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.NET 10 Validation

Note: this is an update to my original post . Introduction I wrote about  entity validation  in the past, the reason I'm coming back to it is that there are some changes in .NET 10, related to validation. Let's cover the original validation API and then explain what has changed. .NET Validation Validation is implemented in the System.ComponentModel.DataAnnotations namespace. I'll describe it first and then move to the small changes in .NET 10. .NET has featured a way to validate classes and their properties for a long time, the API is called  Data Annotations Validation , and it integrates nicely with ASP.NET Core MVC and other frameworks (not Entity Framework Core, as  I've talked recently , nor ASP.NET Core Minimal APIs ). It is essentially, but not just, based on a set of attributes, one interface, and a class that performs validations on a target class and its properties, from the validation attributes it contain. The base class for attribute validation is ca...
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