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Basics

Introduction

.NET is a Microsoft framework for building web and enterprise apps with C#.

Installation

.NET installation uses the .NET SDK for Windows macOS and Linux.

Running Code

.NET code runs via dotnet run or IDEs with .cs files.

Syntax

.NET syntax in C# uses semicolons and curly braces with type safety.

Variables

.NET variables use var or explicit types with immutable options.

Data Types

.NET data types include int string and bool with type inference.

Type Inference

.NET type inference uses var to reduce explicit type declarations.

Null Safety

.NET null safety uses nullable reference types with ? for safety.

Operators

.NET operators include arithmetic and null-coalescing operators.

If Else

.NET if-else statements control flow with pattern matching.

Switch

.NET switch expressions handle cases with type patterns.

Loops

.NET loops use for foreach and while with break and continue.

Comments

.NET comments use // and /* */ with XML docs for APIs.

Errors

.NET errors use try-catch with typed exceptions for safety.

Debugging

.NET debugging uses Visual Studio with breakpoints and logging.

Best Practices

.NET best practices include null safety, async patterns.

Security Basics

.NET security ensures safe input handling with validation.

Projects

.NET projects use csproj files for dependencies and builds.

CLI

.NET CLI with dotnet commands manages projects and builds.

Console

.NET console output uses Console.WriteLine with formatting.

Functions

.NET functions in C# use methods with typed parameters.

Lambda Expressions

.NET lambda expressions use => for concise functions.

Delegates

.NET delegates define typed function pointers for callbacks.

Anonymous Methods

.NET anonymous methods use delegate for inline logic.

Extension Methods

.NET extension methods add functionality to existing types.

Async Methods

.NET async methods use async/await for non-blocking calls.

Generic Methods

.NET generic methods use <T> for type-safe polymorphism.

Classes

.NET classes use class with properties and methods.

Structs

.NET structs are value types with lightweight data.

Records

.NET records provide immutable data with init-only setters.

Interfaces

.NET interfaces define contracts with default implementations.

Inheritance

.NET inheritance uses : for base class extension.

Abstract Classes

.NET abstract classes define blueprints with abstract members.

Enums

.NET enums define named constants with underlying types.

Properties

.NET properties use get/set with auto-implemented backing.

Arrays

.NET arrays are fixed-length typed collections with indexing.

Lists

.NET lists use List<T> for dynamic typed collections.

Dictionaries

.NET dictionaries use Dictionary<TKey TValue> for key-value pairs.

HashSets

.NET HashSets store unique elements with set operations.

Tasks

.NET Tasks enable asynchronous programming with Task.Run.

Async/Await

.NET async/await simplifies Tasks with error handling.

Parallel

.NET Parallel class runs concurrent loops with Parallel.For.

Locks

.NET locks use lock keyword for thread-safe access.

Concurrent Collections

.NET concurrent collections like ConcurrentDictionary ensure thread safety.

File Reading

.NET file reading uses File.ReadAllText with async support.

File Writing

.NET file writing uses File.WriteAllText with buffered streams.

File Paths

.NET file paths use Path for cross-platform handling.

File Deletion

.NET file deletion uses File.Delete with error handling.

HTTP Server

.NET HTTP server uses ASP.NET Core for web apps.

HTTP Client

.NET HTTP client uses HttpClient for API calls.

HTTP Routing

.NET HTTP routing uses ASP.NET Core for endpoints.

JSON Handling

.NET JSON handling uses System.Text.Json for serialization.

JSON Serialization

.NET JSON serialization uses JsonSerializer.Serialize with types.

JSON Deserialization

.NET JSON deserialization uses JsonSerializer.Deserialize with classes.

ASP.NET Core

.NET ASP.NET Core builds scalable web apps with MVC and Razor.

Razor Pages

.NET Razor Pages simplify web apps with page-based routing.

MVC

.NET MVC organizes web apps with controllers and views.

Blazor

.NET Blazor builds interactive web UIs with C# and WebAssembly.

REST APIs

.NET REST APIs use ASP.NET Core with JSON responses.

GraphQL APIs

.NET GraphQL APIs use HotChocolate for typed queries.

WebSockets

.NET WebSockets use SignalR for real-time communication.

Authentication

.NET authentication uses Identity or JWT for secure APIs.

Environment Variables

.NET environment variables use Configuration for settings.

CORS

.NET CORS enables cross-origin requests with middleware.

Entity Framework

.NET Entity Framework maps database queries to C# objects.

SQL Server

.NET SQL Server uses EF Core or ADO.NET for queries.

PostgreSQL

.NET PostgreSQL uses Npgsql with EF Core for typed queries.

MongoDB

.NET MongoDB uses MongoDB.Driver for document data.

Database Transactions

.NET database transactions use EF Core for atomicity.

Logging

.NET logging uses Microsoft.Extensions.Logging for structured logs.

Error Logging

.NET error logging captures exceptions with Serilog.

Request Logging

.NET request logging tracks API calls with middleware.

Testing

.NET testing uses xUnit or NUnit with dotnet test.

Unit Testing

.NET unit testing uses Assert for function validation.

Integration Testing

.NET integration testing validates APIs with TestServer.

Mocking

.NET mocking uses Moq for isolated unit tests.

Benchmarking

.NET benchmarking uses BenchmarkDotNet for performance tests.

REST API

.NET REST API with ASP.NET Core handles CRUD with JSON.

Blazor App

.NET Blazor app creates interactive UIs with C# and WebAssembly.

Authentication API

.NET authentication API uses JWT for secure endpoints.

Database CRUD

.NET database CRUD with EF Core handles data operations.

Real-Time Chat

.NET real-time chat uses SignalR for WebSocket messaging.

Razor Page App

.NET Razor Page app creates page-based web UIs.

API Testing

.NET API testing with TestServer validates REST endpoints.

Logging Setup

.NET logging setup with Serilog logs requests and errors.

Dockerized App

.NET Dockerized app uses Dockerfile for deployment.

Entity Framework Query

.NET EF Core query retrieves data with LINQ expressions.

Welcome to .NET Guidebook - Your Free csharp Learning Hub

Basics

Functions

Classes

Data Structures

Concurrency

File I/O

HTTP

JSON

Web Development

Databases

Logging

Testing

Examples