Specification Design Pattern in C#

In computer programming, the specification pattern is a particular software design pattern, whereby business rules can be recombined by chaining the business rules together using boolean logic. The pattern is frequently used in the context of domain-driven design.

In short, the main benefit of using “specifications” is a possibility to have all the rules for filtering domain model objects in one place, instead of a thousand of lambda expressions spread across an application.

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Foreach or For – That is the Question

The discussion about the preference difference between FOREACH and FOR is not new. We all know that FOREACH is slower, but not all know why.

When I started learning .NET, one person told me that FOREACH is two times slower than FOR. He said this without any grounds. I took it for granted.

Eventually, I decided to explore foreach and for loop performance difference, and write this article to discuss nuances. (more…)

Is string operator “+” so simple?

Introduction

A string data type is one of the fundamental data types, along with numeric (int, long, double) and logical (Boolean) ones. You can hardly imagine at least one useful program that does not utilize this type.

On the .NET platform, the string type is presented as an immutable String class. In addition, it is strongly integrated into the CLR environment and is also supported by the C# compiler.

This article is devoted to concatenation – an operation performed on strings as often as the addition operation on numerals. You may think: “What is there to say?”, after all, we all know about string operator “+”, but as it turned out, it has its own quirks.

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