C# (programming language)

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C# (programming language)

Download and install Microsoft Visual Studio

Download and install Visual Studio 2026 (for learning C#, writing programs): WPF, ASP.NET, ASP.NET Core, UWP, Maui, Xamarin, Unity, MonoGame)

Download and install Visual Studio 2022 (for learning C#, writing programs): WPF, ASP.NET, ASP.NET Core, UWP, Maui, Xamarin, Unity, MonoGame)

Download and install Visual Studio 2019 (for learning C#, writing programs: WPF, ASP.NET, ASP.NET Core, Xamarin, Unity, MonoGame)

Download and install Visual Studio 2017 (to learn C#, writing programs: WPF, ASP.NET, ASP.NET Core, Xamarin, Unity, MonoGame)

New app for learning C#

Creating a new console application to learn C#

Debugging Code

Debug.Assert(false) Debugging Code in C#

For debugging, option "Common Language Runtime Exceptions" see exceptions when a program is running C#

Attribute [Obsolete("My method is outdated. Do not use", false)] Warning when compiling code in the C#

Data Types C#

C# data types: number (bool, char, byte, int, long, float, double, decimal), text (string), enumeration (enum), class (class), structure (struct)

Structure Boolean in the C# it is a flag with values true or false (bool) and methods for conversion bool

Structure Int32 in the C# it is a signed integer (int) and methods for conversion int

Structure Single in the C# this is a floating-point number (float) and methods for conversion float

var ... Variable of any type in the C#. Example: var str = "Hello!";

Type dynamic in the C#

Default values in the C#

Storing objects in memory. Removing Objects from Memory

Reference types and value types in the C#

Stack (stack) - memory for method parameters and local variables in the C#

Heap - dynamic memory available at run time in the C#

Interface IDisposable. Write code to properly release unmanaged resources in the destructor and in the interface IDisposable in the C#

Memory. Garbage collector (garbage collector). Automatic memory freeing in the C#

C# type conversion

C# converting a string to a number (string → short, int, long, ushort, uint, ulong, float, double, decimal) | Use Culture (system settings)

C# converting a number to a string (int, double, short, ... → string) with the required accuracy

Text in C# (type string and class String)

Algorithm for intersecting rectangles

What is text in the C# ? Type string and class String. Methods for working with text.

Length (string length in C#). Example: string str1 = "Hello"; int v1 = str1.Length;

CompareTo (compares case-sensitive text in C#). Example: bool bIsSame = str1.CompareTo(str2)==0;

ToLower (converts text to lowercase in C#). Example: string str1 = "HELLO World!"; string str2 = str1.ToLower();

ToUpper (converts text to uppercase in C#). Example: string str1 = "Hello World!"; string str2 = str1.ToUpper();

Split (split the string into words in C#). Example: string[] arrWords = strText.Split(" ");

StartsWith (checks the beginning of the text with the specified case-sensitive text in C#). Example: bool bStart = str1.StartsWith(str2);

Contains (checks whether the text specified is case-sensitive or not in case-sensitive C#). Example: bool bFound = str1.Contains(str2);

IndexOf (searches for a case-sensitive string and returns the position in C#). Example: int pos = str1.IndexOf(str2);

Substring (returns part of the text from the specified position and length in the C#). Example: string str1 = "Hello World!"; string str2 = str1.Substring(2, 5);

IsNullOrEmpty (checks the text for blank or for null in the C#). Example: string name = "Hello World!"; bool bFlag = String.IsNullOrEmpty(name);

IsNullOrWhiteSpace (validates text on null or on text with spaces in the C#). Example: string name = " "; bool bFlag = String.IsNullOrWhiteSpace(name);

[] (returns a character from the specified position in the C#). Example: char symbol = str[1];

Format (text formatting, strings in the C#). Example: string strNew = String.Format("Hello {0}, {1}", name, year);

+ (add lines and text in the C#). Example: string str = str1 + str2 + " people!";

$ (string interpolation in the C#). Example: string result = $"Hello {a} + {b} = {a + b}";

Symbol @ before the beginning of the line in the C#. Example: string str1 = @"aaa";

Use @ and $ together (C# string interpolation)

DateTime in C#

What is DateTime in C# ? Convert to a string with the format

Enumerations in C # (enum)

What is enumeration? (enum) in the C# ?

How to convert text to enum in C#

How to enumerate all elements in enum in C#

null

null value for simple types. Use ? or Nullable in the C#

Operator ?? (null-union) in the C#

try-catch

Exception handling in C#. Operator try catch finally

Classes in C# (class)

What is a class? in the C#?

Class Access Modifiers in the C#. Access modifiers for methods, properties, fields in the C#

"partial class" in the C#. Description of the class in different files

[bgcolor=#F5F9DB]Constructors for a class[/bgcolor]

Class Constructor in the C#

Initializing a Class Object (set values for fields) in the C#

To call the constructor at the base class in the C#

Static constructor in class C#

"base" To call a method from the base class. To call a variable from the base class. To call the constructor from the base class. C#

"this" To set or get a value from a class field. To call the constructor from the class. C#

[bgcolor=#F5F9DB]Class Destructors[/bgcolor]

Class Destructor in the C#

Destructors in classrooms (how basic destructors are called) C#

[bgcolor=#F5F9DB]Inheritance[/bgcolor]

What is class inheritance in C# ?

[bgcolor=#F5F9DB]Inheritance using new[/bgcolor]

Use new for the interface method. Inheriting an interface from an interface with the same method

Use new for the class method. Inheriting a class from a class in C#.

[bgcolor=#F5F9DB]Inheritance using sealed[/bgcolor]

sealed class. Prohibition to inherit in the C#

Inheriting a class from a class in C#. We use words virtual, override, sealed for class methods

[bgcolor=#F5F9DB]Abstract class[/bgcolor]

What is an abstract class? in the C# ? Abstract methods, properties, indexes.

Inheritance from a class abstract in the C#. Use abstract and override for class methods

[bgcolor=#F5F9DB]Constants and readonly [E_M_P_T_Y] fields in the classroom[/bgcolor]

Constants in the classroom C#

readonly . For a class field. This field is read-only in C#

[bgcolor=#F5F9DB]Properties get and set in the classroom C# (accessors)[/bgcolor]

get set Properties in a class C#

Inheritance (virtual, override) for get and set accessors in C#

[bgcolor=#F5F9DB]Operators, indexers in C#[/bgcolor]

Operators in a C# class. Operator overload: > < ++ + true false

Indexers in Class C#

[bgcolor=#F5F9DB]Nested types in C#[/bgcolor]

Nested class, structure in C#

[bgcolor=#F5F9DB]Parameters in the C#[/bgcolor] class method

ref and out (return parameters by reference in the C# method). Example: public void AddValue(ref int value)

Default parameters (optional parameters) in a C# method. Example: public int CalculateSum(int a, int b, int c=7)

C# named parameters. Example: public void CalculateSum(a:7, b:3);

[bgcolor=#F5F9DB]Generic methods, generic classes in C# (templates)[/bgcolor]

A method with generic parameters in C# (templates). Example: public double Sum<T1, T2>(T1 value1, T2 value2) { ... }

A generic (typed) class in C# (templates). Example of a class Book<T> { ... }

where Type constraint in a generic (typed) class in C# (templates). Example of class Dog<T> where T : Cat

[bgcolor=#F5F9DB]Converting a class object from one type to another[/bgcolor]

explicit is an explicit conversion operator in the C class#

implicit is an implicit conversion operator in class C#

Converting a class object from one type to another in C#. Use try( ) is as

Converting a class object from one type to another in C#. Using pattern matching is switch

[bgcolor=#F5F9DB]Class object in C#[/bgcolor]

? conditional null operator in C#

The class object contains a reference in C#

How do you copy objects in C# to copy class data instead of a reference?

[bgcolor=#F5F9DB]Static constructor and static properties and methods[/bgcolor]

Static constructor in class C#

Static methods, properties, members in class C#

[bgcolor=#F5F9DB]Additional class features in C#[/bgcolor]

The extension method in C# (this in the first parameter of the method). Example: static public void AddValues(this List<int> myList, int value1, int value2)

[bgcolor=#F5F9DB]Class naming conventions in C#[/bgcolor]

What letters, lowercase or uppercase, to call classes, methods, properties... in C#

Is it correct to create a separate .cs file for each class in C#? Or write C# classes in a single .cs file?

Static Class

Static Class in C#

Anonymous Class

An object with an anonymous (missing) type in C#. Example: var book = new { BookName = "Lord of the Rings", Price = 100 };

Interfaces

What is interface in C#?

Inheriting the interface from the interface in C#

Inheriting a class from an interface class in C#. Using override and virtual for class methods

Generalized (typed) interface in C# (templates). Example interface IUser<T> { ... }

Struct structure

What is a structure in C#?

Structure access modifiers in C#. Access Modifiers for Methods, Properties, Struct Fields in C#

Initializing a Structure Object (Setting Values for Fields) in C#

How to change the value in an array of structures or in a collection of structures (List) in C#

Nested structure in C#

[bgcolor=#F5F9DB]Converting a struct object from one type to another[/bgcolor]

implicit is an implicit struct-to-C conversion operator#

explicit is an explicit struct-to-C conversion operator#

Lazy class loading in C#

Lazy Object Creation in Memory (class Lazy in C#)

Tuples

Tuples in C#

Dynamic objects with any properties

DynamicObject and ExpandoObject in C#

Arrays

What are arrays? array in C#

Initializing an Array (Populating the Array Elements) in C#

params passing any number of parameters to a method in C#

Array class C#

Collection

What are collections in C#?

What are non-generic collections in C#? ArrayList, Stack, Queue, Hashtable, SortedList, BitArray classes

What are generic (typed) collections in C#? The classes are List<T>, SortedList<T>, Stack<T>, Dictionary<TKey, TValue>, LinkedList<T>, Queue<T>, HashSet<T>, SortedSet<T>, ConcurrentDictionary<TKey, TValue>, SortedDictionary<TKey, TValue>

Non-generic collection classes (different types of items are stored in the same collection)

IEnumerable interface. The most basic interface for collections in C#

Interfaces: ICollection, IList, IDictionary. The basis for collections in C#

ArrayList class (collection in C#)

What is ArrayList in C#?

SortedList class (collection in C#)

What is SortedList in C#?

Stack class (collection in C#)

What is Stack in C# ?

Queue class (collection in C#)

What is Queue in C# ?

Hashtable class (collection in C#)

What is a Hashtable in C# ?

BitArray class (collection in C#)

What is BitArray in C#?

Generic, typed collection classes in C# (elements of the same type are stored in the same collection)

IEnumerable interface<T>. The most basic interface for typed collections in C#

Interfaces: ICollection<T>, IList<T>, ISet<T>, IDictionary<TKey, TValue>. Basis for typed collections in C#

List class<T> (typed collection in C#)

What is List<T> in C#?

Initializing the Collection List in curly brackets in the C#

Methods

for, foreach (go through all the items in the List<T>) in C#

Find (looking for an item by criterion in the List<T>) in C#

FindAll (looking for a list of items by criterion in the List<T>) in C#

ForEach (for each List element an<T> action is performed) in C#

LinkedList class<T> (typed collection in C#)

What is LinkedList<T> in C# ?

SortedList<TKey, TValue> class (typed collection in C#)

What is SortedList<TKey, TValue> in C# ?

Stack class<T> (typed collection in C#)

What is Stack<T> in C# ?

Queue class<T> (typed collection in C#)

What is Queue<T> in C# ?

HashSet class<T> (typed collection in C#)

What is a HashSet<T> in C# ?

How HashSet works<T> in C#

SortedSet class<T> (typed collection in C#)

What is a SortedSet<T> in C#?

ObservableCollection class<T> (typed collection in C#)

What is ObservableCollection<T> in C#?

Dictionary<TKey, TValue> class (typed collection in C#)

What is Dictionary<TKey, TValue> in C# ?

Initializing Elements in the Dictionary<TKey, TValue> Constructor in C#

How Dictionary<TKey, TValue> works in C#

How to convert IEnumerable to → Dictionary in C#<TKey, TValue> . Using the ToDictionary method

SortedDictionary<TKey, TValue> class (typed collection in C#)

What is SortedDictionary<TKey, TValue> in C# ?

ConcurrentDictionary<TKey, TValue> class (typed collection in C#)

What is ConcurrentDictionary<TKey, TValue> in C# ?

Methods with examples

AddOrUpdate (add or update a value by key in ConcurrentDictionary<TKey, TValue>) in C#

Asymptotic complexity for adding, removing, taking an item in collections

Asymptotic complexity for adding, removing, taking an element in collections C# (List, SortedList, Stack, Dictionary, LinkedList, Queue, HashSet, SortedSet, ConcurrentDictionary, SortedDictionary)

Sorting Elements in the [] Array and List <T>Collection

Sorting elements in the [] array and List collection<T> in C#. IComparable interface

Sorting elements in the [] array and List collection<T> in C#. IComparer interface

My implementation of IEnumerator, IEnumerable, and iterators

Example: My implementation of the IEnumerable and IEnumerator interfaces in C#

Iterators and yield in C#. Examples of IEnumerable implementation with yield

Extension Methods for IEnumerable<T> (Search, Replace, Value Sampling) in C#

Methods for finding, replacing, and fetching values in IEnumerable<T>. Extension methods for IEnumerable<T> in C#

Any (IEnumerable extension method<T>) in C#

Select (IEnumerable extension method<T>) in C#

GroupBy (extension method IEnumerable<T>) in the C#

GroupJoin (extension method IEnumerable<T>) in the C#

Sorting, filtering in LINQ (Language-Integrated Query)

What is LINQ in C#?

Sorting, filtering list items using LINQ in C#

Books for learning LINQ in C#

Pointers

Pointers in C#. Operator unsafe

Pointers to structs, class fields, arrays in C#. Operators unsafe, stackalloc, fixed

Working with files

Open the file, read the text from the file and break it down by words. C#

Create a text file, write the text to a C file#

Create an HTML file, write tabular data in an HTML file | C#

Create a binary file, write bytes to file C#

Partial upload of a file from FTP to C#

Class Path. Combine method - merges the strings into the full path of the file. And other methods of the Path class | C#

Serialization

What is object serialization in C#? [Serializable] attribute

Serializing a C# object into a binary file. BinaryFormatter class. [Serializable] attribute

Serializing a C# object into an XML file. XmlSerializer class. [Serializable] attribute

Serialization of a C# object into a JSON file. DataContractJsonSerializer class. [Serializable] attribute

Serializing a C# object into a SOAP file. SoapFormatter class. [Serializable] attribute

Namespaces

Namespace using in C#

Delegate

Delegate in C#

Add method(s) in a C# delegate. Unification of delegates. Removing a Method from a Delegate

Delegate as a parameter in method C#

Unnamed, anonymous method in C# (method described in place of parameter, delegate)

Universal Delegates

Generic, generic delegates in C# (templates)

Action, Predicate, and Func Universal Delegates in C#

Events

Events in C#

Lyamda

Lamda (example) in C#

Regular expressions

Regular Expressions in C#

Breaking the text into words (regular expressions in c#)

Put * instead of the last name after the first letter (regular expressions in c#)

Breaking the text into words (regular expressions in c#)

Process, process modules

Process in C# (Process class)

Process modules in C# (ProcessModule class)

Threads, multithreading

Threads in C# (Thread class)

Thread Pool in C#

What"s the difference between background and foreground in C#?

Synchronizing Threads in C#

Parallel Library Task (TPL)

Parallel Library Task (TPL). Parallel Task Library in C#

The Parallel class uses the Invoke method to execute the for and foreach (on different CPU cores) methods in parallel in C#

PLINQ parallelizes LINQ queries to run on different processor cores in C#

Asynchronous methods (async and await)

class Task in C#

Asynchronous programming in C# (async, await how to formalize)

Asynchronous programming in C# (using async, await, and Task as an example)

Asynchronous Programming in C# (Theory)

Application domains

What are Application Domains in C# ? (AppDomain class)

Example "Application domain information" (current domain name, list assemblies) in C#

Example "Let"s create the 2nd application domain. Write the class in the 1st domain and use it in the 2nd domain. MarshalByRefObject in C#

Example "Load the 2nd domain of the application from a file, run the calculations, unload the 2nd domain from memory" to C#

Attributes

Attributes for Class, Method, Property in C#

Attribute [Conditional("AAA")] . For compilation, ignore a method or property unless a conditional compilation symbol is defined in C#

Attribute [Obsolete("My method is outdated. Do not use", false)] Warning when compiling code in the C#

The [Display(Name="Sleep at night")] attribute. To store some text attached to a variable | C#

The attribute [Required(ErrorMessage = "Please enter a name")] is described for a property in the C# class and requires the property to be populated if the ErrorMessage error in the MVC ASP.NET is not filled in the screen

The attribute [Remote("IsValidAuthor", "Home", ErrorMessage = "Enter correct author of book")] is described for a property in a C# class and checks that property for correctness on the server via the IsValidAuthor method in conroller Home, if the method returns false, then there will be an ErrorMessage error on the screen in the MVC ASP.NET

Reflection in C#

Nameof operator in C# (class name, method name, variable name)

What is reflection in C#? Type Class

Creating a class object and calling the constructor with parameters using reflection in C#

How to Get Attribute Information Using Reflection

How to get attribute information for a method from a class. Using reflection | C#

How to get attribute information for a property of a class. Using reflection | C#

How to change a property in a class if private using reflection

How to change the set property in a class if private using reflection | C#

Preprocessor directives (if on compilation)

#define #undef #if #elif #else #endif preprocessor directives in C#

How do I define #define for all files (for the entire project) in C#?

What is the CLR assembly and runtime?

Assembly (Assembly) in C#. Compilation. Intermediate code IL (Intermediate Language). Metadata.

How to include a C# assembly in a project?

Utility ildasm.exe. Converts an assembly (C# exe, dll file) to an intermediate language (IL). This utility is easy to learn

The runtime CLR (Common Language Runtime) in C# . JIT (Just-In-Time) compiler.

Creating and connecting our build

Creating our C# build (regular build)

Connecting our C# build (regular build)

▷

Creating our C# assembly (split assembly)

Connecting our C# assembly (split assembly)

Database in Console Application C#

Entity Framework in a C# console application. Using Code First (we write c# code, and the tables in the database are created by ourselves)

Read the image from the database and save it to a file | ADO.NET, C#, console application

DI Dependency Injection in C#

Dependency injection in C# | Dependency Injection (DI)

Ninject (IoC container) dependency management in C#

Autofac (IoC container) dependency management in C#

Convenient Visual Studio utilities

View Class Diagram in C#

exe to C# code

"dotPeek" application for decompile (disassemble) exe to c# source code

In a C# application, call the C++ functions

What are managed code (managed code) and unmanaged code (unmanaged code)? | C# and C++

Marshaling (marshalling) in C#. Type Conversion Between Managed Code (managed code) and Unmanaged Code (unmanaged code)

In the application C# we call functions from Windows dll (C++ WinAPI). Attribute [DllImport("user32.dll")]

In a C# application, call functions from my dll (C++). Attribute [DllImport("My.dll", CallingConvention = CallingConvention.Cdecl)]

Additional topics, questions

You don"t create a new project in Visual Studio 2019. Object reference not set to instance of an object"

C# compilation error: error CS1106: Extension method must be defined in a non-generic static class

C# compilation error: error CS0246: The type or namespace name "Point" could not be found (are you missing a using directive or an assembly reference?)

Why can"t the Dictionary.TryGetValue method find a value by key in C#?

Object-oriented programming (OOP). OOP Principles: Abstraction, Encapsulation, Inheritance, Polymorphism

What letters in C# (uppercase or lowercase or uppercase) should we use to name fields, methods in a class, interfaces, delegates, parameters?

Is it correct to create a separate .cs file for each class in C#? Or write C# classes in a single .cs file?

Is it better to use a built-in int type or an Integer class (string type or String class) in C#?

How do I download and install the version of the .NET Framework I want in Visual Studio?

Boxing and unboxing meaningful types in C#

Error CS8107 Feature "default literal" is not available in C# 7.0. Please use language version 7.1 or greater

Error "unable to connect to web server "iis express" | C# | Visual Studio 2017

Uninstall and install NuGet in Visual Studio

When opening a project in Visual Studio 2019 error: "project requires "SQL Server 2012 Express LocalDB" which is not installed on this computer"

The checked and unchecked math operators

The unchecked math operator in C#

The checked math operator in C#

Additional C# classes

C# Random class

C# Structure Point

C# PointF structure

C# Size structure

C# SizeF structure

C# Rectangle Structure

C# RectangleF structure

It"s time

The amount of time that has elapsed since the system booted (in milliseconds). System.Environment.TickCount in C#

Encryption

Let"s encrypt the password and check it | C# console application

Excell

Reading an excel file in C# (console application)

WWW Sites to Learn C#

Websites to learn C#

Ваши Отзывы ... 1 комментариев

гость
16 марта 2025 16:06

спасибо за изложенный материал!

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