OdataToEntity – an easy way to create .Net Core OData services

When .Net Core was released, the old version of OData ASP.NET Web API turned out to be incompatible with the new platform. This fatal flaw allowed me to create my OData implementation on the .Net Core platform. After the creative rethinking of the previous implementation, I came to an understanding that it suffered from a complicated design with a lot of unnecessary abstractions. An idea to create an easy-to-use library that requires minimal coding came into my mind. I would like to present you OdataToEntity, the library for creating OData services without code writing; the only thing needed is data access context.

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Comparing Objects by Value. Part 2. Implementation Notes of the Equals Method

In the previous article, we have reviewed a general concept of implementing a minimum set of required modifications that include overriding the Object.Equals(Object) and Object.GetHashCode() methods in order to compare class objects by value on a standard .NET framework.

Let’s consider the implementation features of the Object.Equals(Object) method so that it meets the following documentation requirement:

x.Equals(y) returns the same value as y.Equals(x).

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Aspects of Strings in .NET

The string data type is one of the most significant data types in any programming language. You can hardly write a useful program without it. Nevertheless, many developers do not know certain aspects of this type. Therefore, let’s consider these aspects.

Representation of strings in memory

In .Net, strings are located according to the BSTR (Basic string or binary string) rule. This method of string data representation is used in COM (the word ‘basic’ originates from the Visual Basic programming language in which it was initially used). As we know, PWSZ (Pointer to Wide-character String, Zero-terminated) is used in C/C++ for representation of strings. With such location in memory, a null-terminated is located in the end of a string. This terminator allows to determine the end of the string. The string length in PWSZ is limited only by a volume of free space. (more…)

The origin of GetHashCode in .NET

This article is devoted to the GetHashCode method and the GetHashCode implementation in the .NET Framework. The article also discusses the different behavior of the method for reference types and value types. The topic is quite interesting and any self-respecting .NET developer needs to know it. So let’s go!

What’s stored in reference-type objects apart from their field?

Let’s begin our story with learning what is stored in reference-type objects in addition to their fields.

Each reference type object has the so-called header, which consists of two fields: a pointer to the type of the object (MethodTablePointer), as well as a synchronization index (SyncBlockIndex).

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Long Arithmetic from Microsoft

It is known, a computer can operate numbers with a limited number of bits. As a rule, we are accustomed to work with the 32-bit and 64-bit integers. On the .Net platform, the Int32 (int) and Int64 (long) types correspond to these integers.

But what to do if we need to represent, for instance, number 29! = 8841761993739701954543616000000? Such number won’t fit both 32-bit and 64-bit data types. Long arithmetic is designed specifically for working with such big numbers.

In computing technology, long arithmetic implies operations (addition, multiplication, subtraction, division, raising to a power etc.) with numbers, the bitness of which exceeds the length word of the given computer. These operations are implemented not by hardware but by software with the help of basic hardware for working with small-order numbers.

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Under the Hood of Stopwatch

Introduction

As all developers, I often need to measure the execution time of my own (and not only my own) code. When I was a beginning programmer, I used the DateTime structure for this purpose. Time have passed and I learned about the Stopwatch class and began using it extensively. I think most of you had a similar experience. It’s not like I didn’t wonder about how Stopwatch works, at that time, it was simply enough for me to know that Stopwatch measures the elapsed time more precise than DateTime. Now the time has come to explain to myself as well as to the readers how the Stopwatch class actually works and clarify its pros and cons in comparison with DateTime.
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