All posts with Tag .NET

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Free .NET 8 Web API Live Stream's

It's time to stream some ASP.NET 8 Web API Content! For free - just because why not!

In this blog post you will find the details!

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How not to benchmark!

I came across a recent LinkedIn post about the let statement in LINQ and it's performance implication. And in typically influencer fashion it out right claimed that using let in LINQ is a bad idea and should be avoided. But is it a bad idea?

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Codespaces for your open-source project

In this blog post, I will show you how to use GitHub Codespaces to make it easier for contributors to get started on your open-source project. We will set up a codespace for a .NET repository and configure it to install the required dependencies and tools.

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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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NCronJob - June Edition

The last update of NCronJob was some time ago - and as always, there are some new features in the meantime. So here we are, let's go through to highlight them!

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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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Does an HttpClient await the Header and the body?

If you call HttpClient.GetAsync or HttpClient.PostAsync and then await the result, does the await wait only for the headers to be received or does it wait for the body to be received? Let's find out!

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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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Cancel WhenAny - linked CancellationTokenSource

In today's short post, I will show you how to cancel a Task with multiple inputs (aka multiple CancellationTokens) using CancellationTokenSource and CancellationTokenSource.CreateLinkedTokenSource.

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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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MemoryCache, DistributedCache and HybridCache

The latest preview (.NET 9 preview 4) brought another caching structure to the .NET world - so let's order some things here.

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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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Boosting Productivity with Analyzers

I am a big fan of Analyzers, and in this blog post, I will showcase some of my favorite ones!

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Checking your solution for NuGet vulnerabilities or deprecated packages

While your software might be the best in the world, it's only as good as the libraries it uses. In this small blog post, we will discover how to check your solution for NuGet vulnerabilities or deprecated packages.

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How does a List know that you changed it while enumerating it?

Everyone falls for that and tries to change a list while enumerating it greeted by the System.InvalidOperationException: Collection was modified; enumeration operation may not execute. message. But how does the List know that you changed it? Let's find out.

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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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Fluent API to await multiple calls and get their respective results

Sometimes, you have multiple async calls to make, and you want to do that asynchronously and get the results afterward. Let's build a fluent API to do that.

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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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Pattern matching and the compiler can be surprising

Pattern matching is a powerful feature in C#. It allows you to match a value against a pattern and extract information from the value. The compiler does the magic for you - and sometimes it struckles with that.

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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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NCronJob - Scheduling made easy

Hangfire/Quartz or BackgroundService? Why not something in the middle? Did you ask yourself this question from time to time? Do you want to have a full-blown job scheduler with lots of setups, but more than BackgroundService is needed?

Meet: NCronJob!

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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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Typesafety in xUnit with TheoryData<T>

I recently discovered this small but very useful utility in xUnit: TheoryData<T>.

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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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Garbage Collector (over)simplified

In this blog post, a small and (over)simplified infographic on how the Garbage Collector works.

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SearchValues object become better with .NET 9

SearchValues, which were introduced with .NET 8 will become an upgrade and becomes more usable! Let's see how.

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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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Const strings are not so const after all

We know the const keyword with strings - but are they really constant after all? Or can we use some tricks to modify them? Let's see.

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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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A new lock type in .NET 9

There is a new sheriff in town when it comes to the lock keyword, And that is the new System.Threading.Lock type that is introduced in .NET 9. And yes, I know - we still need time to digest the big .NET 8 release.

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The first possible new feature of C# 13: Params collection

Only one month after the big release of .NET 8, the dotnet team is already working on the next iteration: .NET 9. With that also comes new language features. The first one is about to be merged into the main development branch: Params Collections.

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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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A more flexible and enhanced way of logging in .NET 8

The latest version of the .NET (version 8) has introduced a "better" way of logging. This new way of logging is more flexible and enhanced than the previous versions. It is about the LoggerMessageAttribute.

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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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Interfaces can have private methods

Let's drop some "useless" knowledge here. Interfaces can have private methods. This comes with the C# 8 feature: "Default interface methods".

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Structured Concurrency in C#

Did you ever hear about "Structured Concurrency"? If not, this article is for you. We will discover what it is, why it is useful, and what it could look like in C#.

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Questions I asked as .NET interviewer

This blog post is a small collection of questions I asked as a technical interviewer when we had candidates for software developer positions. This might be helpful for you if you are preparing for a job interview.

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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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Enabling List<T> to store large amounts of elements

List<T> is one of the most versatile collection types in .NET. As it is meant for general-purpose use, it is not optimized for any specific use case. So, if we look closely enough, we will find scenarios where it falls short. One of these scenarios is when you have lots of data. This article will look at precisely this.

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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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The "Weak Event" Pattern in C#

Events in C# are a powerful mechanism for decoupling components and enabling a publisher/subscriber model. However, they have a significant drawback: the publisher holds a strong reference to the subscriber, and this can cause memory leaks. This article describes a pattern for implementing weak events in C#.

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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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Enum.TryParse unexpected behavior

Enums are very simple structures, but some functions like Enum.TryParse can have unexpected behavior. In this short blog post, we discover why and what are the alternatives.

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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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What's going on with Moq? SponsorLink and burnt soil!

The famous Moq library faced some criticism due to the usage of SponsorLink. What is the problem, and what is going on here? And obviously, I will add all the sources to the articles.

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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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The combined power of F# and C#

Where C# is the most dominant language in the .NET world, other languages are built on top of the Framework that deserves their respective place. F# is strong when it comes down to functional programming! In this blog post, we will leverage the power of F# and C# to showcase where both excel!

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Gracefully Handling Entity Framework Exceptions with EntityFramework.Exceptions

Working with databases can sometimes be daunting, mainly when errors occur. These errors or exceptions can be due to many reasons, such as constraint violations, connection issues, or syntax errors. Entity Framework throws a generic DbException or DbUpdateException for most of these database issues. But we cand get more specific exceptions based on the concrete "problem"! That's where EntityFramework.Exceptions comes in.

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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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Three tricks with Dictionary

In this short blog post, I want to showcase two nice tricks you can do with everybody's favorite data type: the dictionary.

It is a versatile data structure, and we can make it even more versatile!

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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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Why I like and prefer xUnit

In almost all of my projects, I only use xUnit, and here is a small love letter. Especially the one fact I do think makes it a good choice!

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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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Missing Stack trace when eliding the await keyword

You may have heard that when you elide the await keyword in a method that returns a Task or Task<T>, you lose the stack trace. Buy why does that happen? Let's find out!

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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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Span / Memory / ReadOnlySequence in C#

There are many different memory types used in modern C# programs. The more common ones are Span<T> and Memory<T>. Occasionally there is also ReadOnlySequence<T>. What do these types do?

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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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New Terminal logger for .NET 8

With preview 4 of .NET 8, a new terminal logger was introduced. It basically removes a lot of the noise that the default logger produces. It also adds some nice colors to the output. Let's see how to use it!

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nameof get's a bit better in C# 12

The nameof operator is a great way to get the name of a variable, type, or member. With C# 12 it's getting even better. Let's see how.

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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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6 useful extensions for IEnumerable

I did already write about some useful extension methods for Task and ValueTask. Today I want to show you some useful extension methods for IEnumerable.

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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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Entity Framework and ordered indexes

In Entity Framework 7, the team has added support for ordered indexes to the fluent API. In this blog post we will look at how to use this feature and what it means for your database.

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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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Verifying your DI Container

Microsoft's integrated dependency injection (short DI) container is very powerful, but there are also certain pitfalls. In this article, I will show you what some of the pitfalls are and how you can verify 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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Domain events and the "Unit of Work" pattern

In this blog post, we will discuss the "Unit of Work" pattern and how it can be used to implement domain events in a DDD application. For that, we will also discuss how we can leverage middleware to implement the "Unit of Work" pattern in a .NET application. A lot of things are going to happen in this blog post, so let's get started.

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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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.NET 8 Performance Edition

As with every .NET release, Microsoft improves the performance of the runtime and guess what: This release is no exception to this. In this blog post, I want to go through some of the improvements made so far (.NET 8 preview 3).

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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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Source Generators and Regular Expressions

Source Generators are more and more an integral part of the .NET ecosystem. But how does that play together with everyone's favorite: Regular Expressions?

In this blog post we will dive in how we can leverage source generators in combination with regular expression to have a debuggable, but also very performant way of executing regular expressions!

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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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Creating a ToolTip Component in Blazor

In this blog post we will create a ToolTip component in Blazor from scratch. We will use the Blazor WebAssembly template to create a new project. We will then add a ToolTip component to the project and use it in the Index page. We will also add some styling to the ToolTip component.

The advantage over using a library is that we can customize the component to our needs as well as keeping it simple! So let's get started!

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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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Leverage 'is not' Operator for Exception Filtering!

Did you know you can use the 'is not' operator with exception filtering to simplify and improve your error handling in C#?

In this short blog post, I will show you how to use it.

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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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Write your own AutoMapper in C#

Sometimes you have to map an object to another representation in C#. And you think: Why isn't C# duck-typing capable?

You might hear of libraries like AutoMapper that do the tedious work of mapping one object to another with the same structure. This blog post will give a super simple introduction to how those libraries are working internally.

In the end a bit of a subjective topic on whether or not I would use such libraries.

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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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How to write your own cron Job scheduler in ASP.NET Core (like Quartz, Hangfire, ...)

In this blog post we will discover how to write your own small task scheduler / job scheduler with cron notation in ASP.NET Core. You might know similar approaches under the name of Quartz or Hangfire.

With the help of BackgroundService we will build our own, lightweight version of it.

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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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Is a square a rectangle? Liskov substitution principle in action

I will put that simple question in the room: "Is a square a rectangle?" And you might thank: "Well dah, of course!"

But wait for a second and let's check it together. We will use the L in SOLID: The Liskov Substitution principle to check if this relationship makes sense for us!

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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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Performance (ReadOnly)List vs Immutable collection types

A bit back on LinkedIn, there was a discussion about read-only collection and immutability where this is not the point I want to discuss now, as I already covered that here: "ReadOnlyCollection is not an immutable collection".

This post is just about the performance of those types compared to our baseline, the good old List<T>. It also explains why we see the results we see.

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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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Getting git version information in your C# code

Did you ever need git-specific information like the latest tag or the current commit inside your C# code? Or even the semantic version number of your current build=

Well, there is an easy solution involving source generators.

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error NETSDK1194: The "--output" option isn't supported when building a solution.

Did you see the following error in recent days in your build-pipeline:

error NETSDK1194: The "--output" option isn't supported when building a solution.

If so - that is not necessarily your fault at all! Microsoft released a new SDK version, which breaks your builds. Let's see why and what we can do to tackle that.

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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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What is a Middleware and how to use it in ASP.NET Core?

Did you ever ask yourself: What is a middleware, and why should I use it?

If so, this blog post is exactly for you. We will see where we could use a middleware and also how we can use the Dependecy Injection container of ASP.NET Core.

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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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Deep nesting - Why and how to avoid

... if you need more than 3 levels of indentation, you're screwed anyway, and should fix your program.

This is written in the Linux style guide. Let's see why they have that rule and how we can overcome deeply nested code.

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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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Cohesion - An indicator for refactoring

Cohesion represents the degree to which the elements of a module belong together. A module or class is said to be highly cohesive if its methods and data are highly related, meaning that a change in one affects just a small number of elements.

We can use this metric to know whether or not an object is in a good shape or needs some refactoring.

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Easy Pagination for Entity Framework in 3 steps

Pagination is the process of dividing a set into discrete pages. In the context of Entity Framework, that means we are only getting a certain amount of entries from the database.

And we will implement a very easy solution to make that happen in 3 steps. The result will look like this:

var pagedList = DbContext.BlogPosts.ToPagedList(page: 1, pageSize: 5);

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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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.NET Tips and Tricks & ValueStringBuilder

I want to showcase two of my many side projects. My .NET Tips and Tricks website, where I collect and categorize, well, tips and tricks around .NET-related topics as well as my ValueStringBuilder.

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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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C# 12: Default Parameters in Lambdas

There is still a long road ahead of us until the release of .NET 8, but the first new language constructs are getting public. The first one I want to present is: Default Parameters in Lambdas.

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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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Structure and order your DI container

Does your Dependency Injection container is one big pile of method calls one after the other? Are there 50 lines of just AddScoped, AddTransient, and so on? Well, let's fix this.

We can utilize extension methods to make an order to that mess!

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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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Simple DI - Container

This blog post will show you a very simple Dependency Injection container.

This will give a better understanding of what Dependency Injection is and how it is done. And sure we will see how this is related to IoC - Inversion of Control.

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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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ChatGPT - Current state for .NET - and in general

ChatGPT is going viral right now. Besides funny conversations, you can use that tool to generate also code for you. But does it really hold up to its reputation and it is a serious pairing partner? Let's see.

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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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Abstraction vs Encapsulation

Abstraction and Encapsulation are two fundamental concepts in object-oriented programming. So let us have a small look what the difference is between those two.

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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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New ArgumentException and ArgumentOutOfRangeException helpers in .NET 8

Do you remember how .NET 6 introduced the ArgumentNullException.ThrowIfNull guard? And afterward, with .NET 7 we've got this excellent bit: ArgumentException.ThrowIfNullOrEmpty? Guess what, there might come some new handy additions for the upcoming .NET 8 iteration.

So let's see what are those new changes and how they make the code simpler.

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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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Frozen collections in .NET 8

.NET 7 was freshly released but Microsoft does not sleep. .NET 8 is already in the making and I want to showcase to you one new area where the dotnet team is working on Frozen collections.

So let's have a look at what frozen collections are and how they are working.

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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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How to get allocations in .NET? And how big is an empty array?

Often times we hear about allocations on the heap. How can we easily measure this? This article will show you a very easy way of doing so.

Plus we will answer the question how big is an empty array? And if you think 0 bytes, then spoiler alert, that is not the case at all.

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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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Mutable value types are evil! Sort of...

You might have heard that mutable value types are evil. But why is that and why does the .NET framework use them then? Are they really that evil?

Let's have a look at a few examples and have a look what is going on!

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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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Infographics Compendium III - Exceptions, EF Sanitized, Operators, ...

This edition has the following infographics:

  • DebuggerDisplayAttribute
  • Entity Framework input and LINQ - is it safe?
  • ExceptionDispatchInfo
  • implicit and explicit operator

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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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Throwing exceptions - Why is my stack trace lost?

You might have read, that re-throwing an exception like this: throw exc; is considered bad practice and you should just do this: throw; instead.

But why is it like that?

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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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Cursed C# - Doing shenanigans in C#

In this short blog post I want to show you two silly things so that you can apply right now! Both of them equally silly, but that is not the point (is it ever?).

We will see how to await an integer or TimeSpan and how to foreach through an integer. All of this thanks to the magic of extensions methods.

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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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Infographics Compendium I - Generators, pure functions and more

Sometimes I publish parts of my infographics I publish on various channels with more explanation.

And then sometimes I don't. This time I just put some of my (hopefully self-explanatory) infographics here.

  • Pure functions
  • Generator functions
  • Cost of anonymous types

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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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Pattern matching is awesome

Pattern matching, which was introduced in C# 9, is a hell of a beast and does more than you might think.

In this small blog post I show you where the magic is and what it does under the hood.

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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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Memory is complicated

This is a small story about how memory operates in your .NET application. Well not only .NET but how memory does or does not get allocated.

We will see how a 1 Gigabyte big array is only a few megabytes big to some extend. Furthermore I will discuss working set and committed memory.

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NDepend

NDepend is a static analysis tool for .NET managed code. The tool proposes a large number features, from dependency visualization to Quality Gates and Smart Technical Debt Estimation. For that reasons the community refers to it as the "Swiss Army Knife" for .NET Developers.

So let's check if that descriptionI shamelessly stole from Wikipedia checks out and what we can do with that tool.

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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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Wrap Event based functions into awaitable Tasks - Meet TaskCompletionSource

You might have code where an object offers you an event to notify you when a specific operation is done. But event's can be tricky to use, especially when you want to have a continuous flow in your application.

That is where TaskCompletionSource comes into play. We can "transform" an event based function into something which is await-able from the outside world via the await keyword.

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What is the difference between C#, .NET, IL and JIT?

When you get started or even if you have quite some knowledge it can be confusing to juggle with those terms. So what is the difference between C# and .NET? And what does it have to do with IL and JIT?

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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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The garbage collector in .NET - Part 2: Compacting

I already made a post about how the Garbage Collector works in .NET and also introduced the topic of Generation slightly. This article will look a bit more in detail into why we have those mechanisms in the first place, including the Large Object Heap.

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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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The garbage collector in .NET

This article will talk about the garbage collector in .NET. Why do we have and need him? And why it is essential to understand the behavior to know what impact on our application he has.

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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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Why are sealed classes faster in C#? And should I seal them?

In C# we can add the sealed modifier to a class to indicate that no one is allowed to derive / inherit from that class. Let's have a look at the compiler in certain scenarios what happens if you seal a class.

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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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static abstract interfaces and generic math

Besides the big announcements of .NET 6 there are also some smaller features. I want to show case a special one: static abstract interfaces. With this you have ability to extend the contract in that sense, that an implementing class has to provide also static methods. This feature is right now flagged as preview, but you can use it if you want.

This also enables generic math operations on an interface level.

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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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