Even if you have been working with .NET for some time it can be hard to know the differences between the .NET Framework, .NET Core, and Mono. And what is this .NET Standard thing? In this post I will describe the different architectural components of .NET and hopefully make all of this a bit clearer. …
What is Command Query Separation? The Command Query Separation (CQS) concept is a way to structure your code and methods. The idea is that a method may either be a Command or a Query but not both. It was coined by Bertram Meyer in his book ”Object Oriented Software Construction” from 1994. What identifies a …
The nullable types If you have been coding C# for a while you have probably come across Nullable types (Microsoft link). A Nullable type is in instance of System.Nullable<T> where T can be any non-nullable value type (such as int, float, bool). An instance of System.Nullable<T> can represent any value of the underlying type T …
Last week I wrote about alternatives to returning null. There was however one alternative that I left out, the Maybe functor. The reason I left it out last week was that I hadn’t had the time to read up on it properly. Now that I do have read up on it, and had some time …
What is problematic with returning null? A common pattern, both in the code I am used to work with, and in parts of the .NET Framework, is to return null in methods if for some reason a valid return value is not available. One example of this is the Find method of List<T>: So, why …
Why is debugging Blazor applications different from Angular or React? When you run a JavaScript framework, like Angular or React, the JavaScript code is available on the client-side. This makes it possible to use the built-in developer tools in the browser to inspect and step through the code. When running Blazor applications you execute a …
The RESTful service A couple of blog posts ago I wrote about how to design a REST API with ASP.NET Core and now I intend to show how to create a front end that can interface this service in order to create and remove products from the repository. To recap, the RESTful service was designed to …
Unit testing code that reads or writes to the filesystem can be difficult. One thing that can help is an in-memory file system that lets you emulate the actual file system just for testing purposes. This morning I stumbled across a blog post by Jason Roberts, a five time Microsoft MVP, freelance developer, writer, and …
What is Blazor? To quote the official Blazor homepage ”Blazor is a single-page web app framework built on .NET that runs in the browser with WebAssembly.” The natural follow-up question is then ”What is WebAssembly?”. From the official WebAssembly homepage we can read that ”WebAssembly (abbreviated Wasm) is a binary instruction format for a stack-based …
What is REST? REST is short for Representational State Transfer, and is way to design web services. So called RESTful web services. Usually the RESTful service is accessible via a URI and HTTP operations such as GET, POST, PUT, and DELETE are used to get or modify the data that is often stored in a …
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