Having fun with ValueTuple

Just as a heads up: This blog post will probably bring you 0 value in your daily life - well, maybe a short smile. Let's put ValueTuple to its extreme!

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How to assert assumptions in code that might not be true?

Sometimes we have to make assumptions in our code. For example, that a certain property or variable has a specific value. On top comes, we have a specific idea but we are not 100% sure if they are correct. Let's meet Debug.Assert.

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Comparing the performance between the Minimal API and classic Controllers

Today, we are going to benchmark the performance of the Minimal API in ASP.NET 9 (and for reference against ASP.NET 8 as well) against the classic Controllers. We will test a few scenarios and check how the performance of the Minimal API compares to the classic Controllers. Let's get right into it!

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Managing TaskCancellationTokens in a central service in ASP.NET

In async code it is very common to pass a CancellationToken to the method that is being awaited. This allows the caller to cancel the operation if it is no longer needed. But this will lead to some ceremonial code that is repeated in every method. In this article I will show you how to manage CancellationToken in a central service in ASP.NET.

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How to test HttpClient inside API Tests

I am a great fan of API tests. I do like to utilize the WebApplicationFactory for this. I even wrote some articles about this in the past "Introduction to WebApplicationFactory". But what if we need to "mock" HttpClient calls inside our tests?

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async2 - The .NET Runtime Async experiment concludes

The .NET team has been working on a new experiment called async2, which is a new implementation of the async/await pattern that is designed to be more efficient and more flexible than the current implementation. It started with green threads and ended with an experiment that moves async and await to the runtime. This post will cover the journey of async2 and the conclusion of the experiment.

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The state machine in C# with async/await

You often here that the async/await keywords leads to a state machine. But what does that mean? Let's discuss this with a simple example.

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UUID v7 in .NET 9

.NET natively knows UUID v4 aka Guid.NewGuid(). But with preview 7 we get Version 7 of UUID's natively.

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ReadOnlySet<T> in .NET 9

The next preview (preview 6) will bring a new type ReadOnlySet<T>. This is a read-only set that is similar to ReadOnlyCollection<T>. Let's see how it works and why it was introduced.

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Are my EF LINQ to SQL queries safe?

Have you ever asked yourself if your EF LINQ queries are susceptible to SQL injection attacks? Either because you are querying some user data from a text field or directly taking whatever your API hits against the database?

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StringBuilders magic for very large strings

The StringBuilder class is used to create mutable sequences of characters. Strings are immutable, so if you need to perform multiple operations on a string, it is better to use a StringBuilder instead of a string. This is especially useful when you need to concatenate a large number of strings. But there is more magic to it, especially when we go BIG!

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Help my memory dump always shows me some exceptions!

I made a memory dump in my simplest console application and there are a bunch of exception instances around, what is going on? Let’s see in this blog post, why you see a few exception instances in your memory dump.

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Generate http files from a swagger definition

Http files are nice and handy - but they are also a bit of a pain to update. So why not generate them from a swagger definition?

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.NET 9 LINQ Performance Edition

As with almost every edition of .NET, the team has been working on improving performance. In this blog post, we will see some improvements to the related tickets and benchmarks.

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Does readonly make your code faster?

In this blog post we will discover whether or not the readonly modifier can make your code faster. So without further ado let's get started.

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Equip 3rd party types with a deconstructor

Deconstructor are a C# language feature that allows you to define a method that will be called when an object is being split up into its components. While this is straightforward to implement for your own types, it is not possible to add a deconstructor to a 3rd party type - or is it?

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C# 13: Allow ref and unsafe in iterators and async

C# 13 might get a new feature soon that allows ref and unsafe in iterators and async methods.

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bUnit v2 - The Blazor unit testing library vNext

Next to the big release of .NET 8, we also released the first preview bUnit v2. This release is a major release, with a lot of new features and improvements. In this post, I will highlight some of the most important changes. This includes new features but also some breaking changes.

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Avoid multiple boolean parameters

Boolean parameters are nice, but it's hard to keep track of what each one does when you have multiple of them. In this blog post, we will see why it's better to avoid multiple boolean parameters and how to refactor them.

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Three new LINQ methods in .NET 9

Even though we are in the alpha of .NET 9 and .NET 8 was released not more than two months ago, the dotnet team does not sleep and pushes new changes! In this blog post, we are checking what new methods were added to everyones favorite: LINQ.

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An alternative to AutoMapper

I am not the biggest fan of AutoMapper. It starts with good intentions but often ends up being a big mess. I have seen it used in many projects, and the configuration of the mappings is often scattered all over the place, and or they are huge!

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An asynchronous lock free ring buffer for logging

In this blog post, I showcase a very simple lock-free ring buffer for logging. I'll show why it's useful and how it works.

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Entity Framework - Storing complex objects as JSON

From time to time, it is nice to store complex objects or lists as JSON in the database. With Entity Framework 8, this is now easily possible. But this was possible all along with Entity Framework 7.

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Blazor .NET 8 - Enhanced Form Navigation

There are many new cool features with .NET 8 and Blazor in particular. In this blog post, I want to highlight a feature that I believe is very useful in the new context Blazor is living.

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Interactive LINQ tutorial, especially for beginners

LINQ (Language Integrated Query) is a powerful feature of C# that allows you to query data from different data sources. It is a must-have skill for every C# developer. That is why I created: https://linqmarbles.info/

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Yes you can create classes on the stack!

In this article we will create a class, aka a reference type on the stack, and therefore don't use any managed memory!

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Blazor with TailwindCSS

Ever wondered how to use TailwindCSS with Blazor? Let's make it work!

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.NET 8 and Blazor United / Server-side rendering

New .NET and new Blazor features. In this blog post, I want to highlight the new features that are hitting us with .NET 8 in the Blazor world. So let's see what's new.

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Less boilerplate code with the new primary constructor in C# 12

The new language feature "primary constructor" which will be released with C# 12 / .NET 8 this year (November 2023) allows you to remove some ceremonial code. Let's see how.

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Building a Minimal ASP.NET Core clone

In this article, we will build a minimal version of what ASP.NET Core does - yes, you read right. We will create a very simplistic clone of ASP.NET Core to discuss how the whole thing works. Beginning with a simple console application, we will add the necessary components to make it work as a web server. Bonus points for our own middleware pipeline and dependency injection.

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Turn on Nullability checks by default

Since C# 8, we have nullable reference types. The word sounds odd, given the fact that reference types are always nullable. The idea is that the default is that your reference types have to be properly initialized. Here are my thoughts after a few years of using them.

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Expression-bodied members in properties

Are these two expressions the same?

public class MyClass
{
    public int A { get; } = Random.Shared.Next(1000);
    public int B => Random.Shared.Next(1000);
}

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Creating Your Own Fakes Instead of Using Mocking Libraries

With respect to the current topic around Moq, I want to showcase how you can easily roll out your own fakes so that you are not depending on a third party library.¨

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Keyed Services in the IServiceProvider in .NET 8 preview 7

The .NET 8 preview 7 will bring another exciting feature some of you probably awaiting for a long time: Keyed services.

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How to benchmark different .NET versions

With the famous BenchmarkDotNet library you can benchmark a lot - but it doesn't stop with a single .NET version. You can benchmark multiple versions of the same code that targets different runtimes!

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.NET Framework 4.8 to .NET 6 migration

I was recently tasked to migrate an application with around 150 projects from the "old"^{It is still supported} .NET Framework 4.8 to a recent .NET 6. As the application is still under development and used, the migration should be done step by step over time in iterative steps rather than a big bang refactoring. This blog post will go a bit into more detail about how I approached the situation and what I learned.

This is a highly subjective post, and there are plenty of ways of approaching it - so take it with a grain of salt and mileage may vary.

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Overload resolution in C#

On a recent LinkedIn Post from Saeed Esmaeelinejad, he asked what is the outcome of:

bool flag = SomeMethod();

M(flag ? 1 : 2);

void M(long number) => Console.WriteLine("long");
void M(short number) => Console.WriteLine("short");

What is the outcome?

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LINQ: Select.Where or Where.Select?

LINQ is a very powerful tool for querying data. As the majority of functions are built on top of IEnumerable<T> and it, in most cases returns IEnumerable<T> as well, it is very easy to chain multiple functions together. That leaves you with a question: which one should I use, Select.Where or Where.Select?

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Create your own Mediator (like Mediatr)

In this blog post, I'll show you the fundamentals of the Mediator pattern and how to implement it in your application from scratch. And yes, we basically implement the famous MediatR library.

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How does List work under the hood in .NET?

A List is one of the most used data types in .NET. You can dynamically add elements without taking care of how that happens. But do you know what is going on under the hood?

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Time abstraction in .NET 8

With the upcoming release of .NET, the team introduced an abstraction of time itself. That can bring you major benefits especially if you have to test scenarios where time is a crucial part! Until now, you had to create your own wrapper. This, of course, makes integration with 3rd party libraries tricky.

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How does TryGetNonEnumeratedCount work?

TryGetNonEnumeratedCount attempts to determine the number of elements in a sequence without forcing an enumeration. It returns true if it could and false if it couldn't. The API was added with .NET 6 - let's have a look at how that thing works.

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Some cool things you can do with ValueTuple

In this blog post, we will explore some cool things you can do with ValueTuple. Also, a short explanation of what ValueTuple is and how it works.

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Controlling the log level of your application

In this blog post, we will have a look at the different log levels and how to control them.

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Create your own Validationattribute in ASP.NET Core

In this small blog post, I will show you how to create your own Validation attribute in ASP.NET Core to tailor-made your validation rules.

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Covariance and Contravariance in C#

Let's talk about Contravariance and Covariance in C# using .NET Framework examples!

Contravariance and covariance are essential concepts in C# when dealing with generics, enabling us to have more flexibility when assigning generic types. So let's have examples straight from the framework itself!

Also, we will go a bit deeper and talk what some differences between generic constraints and things like Contravariance are.

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5 useful extensions for Task<T> in .NET

In this short blog post, I will show you 5 useful extensions for Task in .NET. We will build them as extension methods, so there are easy to use. On top, I will show a small example of how to use them. So let's go!

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LINQ on steroids with SIMD

In this blog post, we will explore the use of SIMD instructions to speed up LINQ queries. We will use the Vector type of performing SIMD operations on arrays of data. We will also use the BenchmarkDotNet library to measure the performance of our code. We will also see how this works hand in hand with the new "generic math" feature of C# 10.

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C# Source Generators: How to get build information?

Source generators are a powerful feature introduced to C#, allowing developers to generate additional code during the compilation process automatically. They can help reduce boilerplate, improve performance, and simplify your codebase.

This blog post will introduce source generators, discuss how they work, and walk through an example of a source generator for generating build information.

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Caching in .NET with MemoryCache

In this blog post, we will discuss how we can "cache" entries from the database. We will talk about why we would do this in the first place and how to achieve that.

Also, we will talk about some implications and what "cache invalidation" is.

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LINQ // Skip and Take

Skip and Take are used for pagination or limit the number of elements returned by a query.

Since C# 8 you can use Take with a Range. Let's see some examples.

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Benchmarking - A matter of perspective

In recent months and years, there was a certain hype around benchmarking, also in the .NET community.

This blog post is meant to ground some of the benchmarking topics and put this into relation to other things so you get a better understanding if it's worth the effort.

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The Humble Object Pattern

The Humble Object Pattern is a design pattern to make especially unit testing easier with the goal of separating behaviors that are easy to handle (domain logic) from behaviors that are hard to handle (like external events or dependencies).

So let's have a look at what it is and how you can utilize it.

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From Testing Pyramid to Diamond

In this article, we will discuss the testing pyramid - what it is and what are some problems with that.

We will also discuss a different approach: The testing diamond.

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A (performance) quirk with JsonSerializer

System.Text.Json.JsonSerializer has a weird quirk in regard to performance and memory management. So we will discuss what is "wrong" with this code: JsonSerializer.Serialize(myObject, new JsonSerializerOptions(...));.

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Multi-Tenancy with RavenDB and ASP.NET Core

Multi-tenancy is a software architecture pattern where a single instance of a software application is used by multiple customers, with each customer having separate and isolated data, configurations, and resources. RavenDB is a NoSQL document database that provides a flexible and scalable solution for multi-tenant applications. This blog post will explore why multi-tenancy exists, the advantages of using RavenDB for multi-tenant applications, and provide code examples to get you started.

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Repository Pattern - A controversy explained

In this blog post, we'll dive into the ins and outs of the repository pattern and examine both its benefits and its potential drawbacks. We will start from the very basic to some more advanced use cases. So let's dive right into it.

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C# Lowering

Did you ever hear the word "compiler magic" or "syntactic sugar"? Probably yes and therefore we want to dissect what this "magic" really is!

We can see how we can predict performance or bugs by "lowering" our code. Also we will see how things like foreach, var, lock, using, async, await, yield, anonymous types, record, stackalloc, pattern matching, Blazor components, deconstructor, extension methods... do not really exist.

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C# 12: Primary Constructors

Another new C# 12 feature might drop soon and makes its debut with the next iteration: Primary Constructors.

The blog post will talk about what a Primary constructor is, why we already have it, and what the proposal tries to change. Exciting times are ahead of us!

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Entity Framework 8: Raw SQL queries on unmapped types

The next iteration of Entity Framework, namely Entity Framework 8, will have a new and exciting feature:

Support raw SQL queries without defining an entity type for the result

That means less boilerplate code!

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No, No, No - Tasks are not threads and they are not for performance!

I often read that Task is used for multithreading in C# / .NET, but that is not the case. And it is crucial to understand why this isn't the case. We will also see which problem exactly Task is solving in the first place.

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Give your strings context with StringSyntaxAttribute

Strings are one of the most universal data types. We use them for URLs or regular expressions or even to define some date. With .NET 7 we have a new way of giving those strings a bit of meaning. Meet StringSyntaxAttribute.

I also show you a way how to use them in .NET 6 and earlier.

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ReadOnlySpan<char> and strings - How not to compare them

Many know that you can take ReadOnlySpan<char> objects when dealing with strings. They give you a direct way of operating on the underlying memory. Often times you can use them interchangeably, but there are scenarios where you really have to watch out what is going on.

This blog post will have a look at a major problem with ReadOnlySpan when used like a "regular" string.

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Array, List, Collection, Set, ReadOnlyList - what? A comprehensive and exhaustive list of collection-like types

.NET knows a big list of collection-like types like: IEnumerable, IQueryable, IList, ICollection, Array, ISet, ImmutableArray, ReadOnlyCollection, ReadOnlyList, and many more.

This blog post will give you an exhaustive list of types in .NET and when to use what.

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Delete a record without prior loading in Entity Framework

Sometimes you have an Id of an object and want to delete the underlying thing from the database. But it doesn't make sense to load the whole object from the database to memory first. So how can we achieve this quickly?

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Check for elevated rights in .NET 8

In the past, it was tricky to get if the current process runs under elevated rights. In the sense of it is run under the sudo group in *nix (Unix, Linux, macOS, you name it) or administrative rights in Windows.

But that changes with .NET 8 as we now have a unified API for that.

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How to enumerate through a StringBuilder

Did you ever wonder how we can iterate through a StringBuilder? I mean, of course, we can just call ToString and use the returned string, but that means we materialize the whole thing without good reason.

We can also use a normal for-loop. But we can also find a completely different and probably dumber way! And if you wonder: No, this is not something you do in your daily life, but by doing so, I can show some cool stuff C# and .NET offer.

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A new wave of analyzers in .NET 8

Analyzers did become an integral part of the .NET ecosystem. Their main responsibility is to find potential code issues and warn you. Often times this comes even with potential fixes you can directly apply.

And Microsoft will continue this journey with the upcoming .NET 8 release. This blog post will show you potential candidates, which will make the cut.

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"Use always a StringBuilder" - Internet myths

Use always a StringBuilder

That is what you can read from time to time. The basic idea is, that a StringBuilder is "better" ^{to be defined}.

Why are people telling that ^lie? Let's discuss this and see what it isn't true.

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Anonymous test data with AutoFixture

Often times we have unit or integration tests that rely on some input data. The easiest solution is just to take some hard-coded values and move on with life. This has some major downsides:

Giving specific values in a test carries meaning, but we are often times not interested in that. We just need to pass the object around to fulfill the API. Also the simplest solution to fulfill your test is literally checking against those values.

Here is an elegant solution to that problem: AutoFixture. I will show you what it can do, especially in combination with xUnit.

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Marking API's as obsolete or as experimental

Often times your API in your program or library evolves. So you will need a mechanism of telling that a specific API (an interface or just a simple method call) is obsolete and might be not there anymore in the next major version.

Also it can happen that you have a preview version of a API, which might not be rock-stable and the API-surface might change. How do we indicate that to the user?

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local functions vs lambda expressions

.NET knows local functions and lambda expressions. You can almost take them interchangeably, but there are also some differences between them.

This article will show the differences between them.

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LiteDB - A .NET embedded NoSQL database

In this article we will have a closer look at LiteDB, a .NET NoSQL Document Store in a single data file. We will discover the advantages of LiteDB and why it is a viable candidate for your next project.

We will also explore what are the differences between a NoSQL and a classical SQL database are and what this has to do with the reminiscent SQL CE or the more modern SQLite database.

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Infographics Compendium II - ThrowHelper, null Task and more

This edition has the following infographics:

• ConfigureAwait on IAsyncDisposable
• Index in foreach
• Non-destructive mutations with struct
• Returning null for a Task
• Throw-Helper
• verbatim strings

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Introduction to WebApplicationFactory

This article will show you what exactly a WebApplicationFactory is and why it is so "mighty" when it comes down to testing. I will highlight some of the properties, which you can leverage to write powerful tests.

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x86 vs x64 in .NET

In this article I will show you what is the difference between x86 (32-bit) vs x64 (64-bit) in the .NET World.

What is the impact if you choose on or another.

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Blazor Project Structure

Did you ever wonder what is a nice way of structuring your Blazor application?

I will show you how I structure my Blazor projects (as well as this very blog). What are the upside in contrast to the "default" structuring you get with the Blazor template.

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ASP.NET Core - Why async await is useful

Did you ever wonder why you "should" use async and await in your ASP.NET Core applications? Most probably, you heard something about performance. And there is some truth to it, but not in the way you might think.

So let's discuss this with smaller examples.

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EF7 - Bulk updates and Bulk deletes

Finally the long awaited bulk update and bulk delete feature is heading towards Entity Framework 7. So we will have a look how to use it and what might be some limitations.

Also I will have a quick look at the performance aspect, because this was the main driver for that feature.

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LINQ explained with sketches

Often times it is easier to have a nice illustration at hand, which explains you things the easy way. So let's do this for a lot of LINQ operations like Where, Select and friends.

Of course a small explanation will be attached as well.

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Logging Source Code Generators

Since .NET6 we have the possibility to define an easy way of logging common statements:

Meet Compile-time logging source generators. This article will show why we have them and how to use them. Of course a smaller benchmark will also follow.

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Abstract class vs interface

In C# we have abstract classes and we also have interfaces. Both seem very similiar but they are fundamentally different concepts.

Therefore let's discover what the difference is, what the overlap is and when to use what.

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C# vNext - What could come

C# 11 is in front of our doorsteps. A lot of the features are know, so let us have a look at the future. We will discover some features which could be included in C# 12 or later.

Base for this is the csharplang-repository. So let's discover brand new features and how they could help us in our everyday life. We will see things like:

• Compound assignments in object initializer
• Discriminated unions
• semi-auto properties aka field
• ConfigureAwait(false) on assembly level
• Exponentiation operator

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When does Blazor (not) render?

This blog post whill shed some light on when Blazor renders your content. Of course there are obvious candidates, but there are also some things to be aware about.

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goto in action - The exception from the rule

A lot of developers will say never use goto. This keyword is bad as it promotes spaghetti code. But as so often in live the exception confirms the rules. Let's see where goto can increase the readability and maintainability.

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Delegate, Action, Func, Lambda expression - What the heck!?

C# offers a lot of utility especially around the delegate topic. So let's see what exactly a delegate is and how the distinct types like delegate, Action, Func, Predicate, anonymous function, lambda expressions and MulticastDelegate behave. A lot to digest and discover so let's go.

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ObjectPool - Rent and return some instances

Just imagine a car pool: There is a dealer which bought the car and lent's it to you. After a while you will return this car where you got it from. Much like that works an ObjectPool in C#. You can rent an expensive object from the pool and when you are done with it, you just return it. Sounds beautiful, doesn't it?

Let's explore the advantages and disadvantages of a ObjectPools and how they work.

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How to unit test a RavenDB

RavenDB is a well known open-source document-oriented databse for .NET. And of course we want to test our logic and not only locally while developing, but also our continuous integration pipeline should be able to run our tests. So let's tackle exactly that.

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Blazor with CancellationToken support

What happens when a user navigates away and still has a pending request to our server? Or what happens if we have a request which might take forever and wastes our resources?

Let's tackle these problems with a CancellationToken.

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Tail-Recursion - Explained with the Fibonacci series

What is Tail-Recursion? We will discover this "special" form of recursion on the example of the Fibonacci series. Also we will check how much faster it is and why.

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Passing by value or by reference - What is faster?

When we are passing objects around we can do this either via reference or by value. Which of those two methods is faster?

To answer this question we have to dive into a bit of info about what happens exactly when you pass something around and how the other side will receive this.

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Is public const bad?

Is declaring a number or string as public const considered bad practice? Let's have a look what a const variable means in the first place. Let's find out and also check what are the alternatives.

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4 Different ways of creating an array

In this blog post I will show you 4 different ways of creating an array and how they differ from each other.

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From Zero to Production - Generate everything with a single button

This blog post will show you how to setup, from scratch, your GitHub repository so you can in a matter of a single click:

• Run tests and build your application
• Release the application for example to nuget
• Create a Release on GitHub with Release notes
• Update the documentation utilizing GitHub Pages and DocFx

Therefore we will build a "template" repository you can take as a foundation.

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Create a low allocation and faster StringBuilder - Span in Action

.NET ships a nice StringBuilder since the dawn of time or at least since the beginning of the framework itself. The intention is simple: If we need to concatenate a lot of strings we can't rely on the + operator as we introduce a lot of unnecessary allocations plus it is slow! That is where the StringBuilder jumps into the picture.

Why is that? Why is the StringBuilder better? And can we do better? Spoiler: Yes!

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UNO Platform - Build a Todo App - Part 5

This is the last part of the series (for now 😄). In the last. Two parts are missing:

• Drag and Drop the items from one lane to another
• Save and load the state

And exactly those two things we will tackle. I also will give a small conclusion of my journey.

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The Trie - A powerful data structure

A Trie is a common data structure used for example for auto completing words. We will discover how to built our own Trie and check how fast he competes against a "normal" Hashset.

Also we will build a TypeAHead input component which automatically offers us some suggestion based on our input. Of course, we will use our newly created Trie.

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UNO Platform - Build a Todo App - Part 2

This is the second part of our small mini series, where we build a todo app Kanban style with the UNO Platform. In this episode we are laying some ground work as well as defining all of our requirements we want to achieve.

We will slowly start creating our first components and make everything work smoothly together.

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Using SSE in C# on the example of the sum of a list

SSE stands for Streaming SIMD Extensions. What does that exactly mean and how can we leverage that in our C# code?

This blog post will shed some light on this topic. Also we make a small comparison to PLINQ.

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RequiredIf - Extend the validation in Blazor

Just imagine you have your beautiful model in a form. And Blazor is very kind and does validation for you. It is really straight forward because you can annotate your model with some attributes like RequiredAttribute to tell Blazor: "Hey this property has to be set, otherwise the form will not be submitted."

But what if you want to have that easy setup with attributes but also want to say to Blazor: "Hey this property has to be set, if the other property is true.* Well, that does not work out of the box. So let's make it together!

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DebuggerTypeProxy - Displaying complex states in the debugger

With the DebuggerTypeProxy we have the possibility to show more complex states. This can be helpful in certain cases where an object for example has a lot of properties.

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Heap, Stack, Boxing and Unboxing, Performance ... let's order things!

In this article I will shade some lights on some of the most used terms which seems very confusing especially for beginners: heap, stack and boxing and unboxing.

Furthermore we will also encounter internet wisdom like:

Value types get stored on the stack. Reference types on the heap

We discuss why this is wrong and what the hell performance has to do with it?

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Enum.Equals - Performance analysis

Did you know that you can spend 100x times longer depending how you compare your enums?

Of course we are speaking here in terms of nanoseconds but this story is much more then just numbers. We'll also talk about boxing and unboxing. So let's dive right into it.

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Generator-Function in C# - What does yield do?

Since the introduction of C# 2.0 we have the yield keyword with in combination with the IEnumerable<T> type works as a generator function. We can return elements one by one.

But how does that thing work internally? And what does it have to do with async / await?

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ILGPU - Processing Data on your GPU (CUDA / OpenCL in C#)

If you ever needed a massive amount of data processed in parallel you might had a look at OpenCL or CUDA. Both are based on a subset of C to describe the program your GPU has to execute.

So let's have a look how we can achieve this in the .NET way. Furthermore I'll give you some insights about GPGPU (General-purpose computing on graphics processing units) in general. Also some limitations and big differences to conventional "CPU"-Programming.

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A better enumeration - Type safe from start to end

Enumerations are one of the fundamental value types in C#. enum's are handy if you have a constrained set of allowed values. But the enum type also has a lot of drawbacks. Personally, one major issue for me is that you can't define methods inside the enum. Plus, you can just pass them invalid values and it just works (Todd Howard I'm looking at you).

So why not make a lightweight alternative which removes a lot of the shortcomings of an enum?

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IEnumerable vs IQueryable - What's the difference

.NET brings two types which seem very similiar

• IEnumerable
• IQueryable

What is the difference? Most are familiar with using IQueryable when we want to go to the database and back. But why not using IEnumerable?

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Shorts: foreach on type without IEnumerable

Is it possible to have a foreach loop over a type which does not implement IEnumerable? Yes it is.

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A story about boxing / unboxing and string interpolation in C#

A story about boxing / unboxing and string interpolation in C#. What has string interpolation to do with boxing / unboxing and what's the impact?

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Quickly asked: Should I use unsigned integers (uint, uint8, ...) in C#?

Should I use uint as a type in my library / website / program? For example when iterating through an array? I mean that thing can't be smaller than 0!?

So let's have a look.

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Tutorial Unit and E2E Testing in Blazor - Part 1

This blog post should give you an easy and good introduction how to unit and end-to-end test your Blazor Application. Furthermore it does not matter if we are running server side or client side aka WebAssembly. The main two libraries we are using is first bUnit for unit-testing and Playwright for end-to-end testing. So let's dive in!

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My first Post

Welcome to my blog and my first post

In this article I will show you why I created my own blog-software from scratch and why I have a blog in the first place. Short answer: I like to know how to create a blog and I like blazor. Long answer you will find in the post.

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