ASP.NET Core API For Beginners

عن بعد/اونلاين
برمجة سي شارب | c# programming برمجة | Programming برمجة ويب | Web programming قواعد بيانات | Database Asp.net | Asp.net

What is an API?
- Explanation of APIs (Application Programming Interfaces).
- Difference between Web API and Web Services.
- Understanding RESTful APIs:
  - Stateless, resource-based APIs.
  - HTTP verbs (GET, POST, PUT, DELETE) and their roles in APIs.
Why Build APIs with ASP.NET Core?
- Lightweight, high-performance framework for building APIs.
- Cross-platform capabilities (Windows, macOS, Linux).
- Integration with modern front-end frameworks (React, Angular, etc.).

Creating a Web API Project
- Using Visual Studio or Visual Studio Code to create a new API project.
- Choosing the correct project template (ASP.NET Core Web API template).
Project Structure for APIs
- Overview of important files and folders:
  - Controllers: Contains API controllers.
  - Startup.cs or Program.cs: Configuring services and middleware.
  - appsettings.json: Configuration settings, including connection strings.

Creating a Controller
- What is an API controller? How is it different from an MVC controller?
- Creating a new controller that inherits from ControllerBase.
Action Methods and HTTP Verbs
- Defining action methods to handle HTTP requests (GET, POST, PUT, DELETE).
- Return types: IActionResult, ActionResult, and HTTP status codes (200 OK, 404 Not Found, 400 Bad Request, etc.).

Understanding Attribute Routing
- How to define routes using attributes ([Route("api/[controller]")], [HttpGet], [HttpPost], etc.).
- Defining route parameters ([HttpGet("{id}")]).
- Using convention-based vs attribute-based routing.

What are DTOs?
- Purpose of DTOs in APIs (separation of concerns, security, optimization).
- Creating simple DTO classes to shape data for API responses and requests.
Mapping Between Entities and DTOs
- Using manual mapping or libraries like AutoMapper to map between your domain models and DTOs.

Connecting to a Database with EF Core
- Setting up Entity Framework Core in your API project.
- Configuring a database connection (using SQL Server or SQLite).
- Creating and managing database tables for your API (using migrations).
CRUD Operations
- GET: Retrieving data (e.g., fetching all records or a specific item by ID).
- POST: Creating a new resource.
- PUT/PATCH: Updating an existing resource.
- DELETE: Deleting a resource.

Input Validation
- Using Data Annotations for input validation (e.g., [Required], [MaxLength], etc.).
- Validating incoming data to ensure it meets specific rules.
Error Handling
- Global error handling in ASP.NET Core.
- Returning appropriate status codes for different scenarios (400 for bad requests, 500 for server errors, etc.).
- Using ModelState.IsValid to check if the incoming data is valid.

Securing Your API
- Overview of API security principles.
- Introduction to JWT (JSON Web Tokens) for authentication.
Protecting Endpoints with Authentication
- Configuring JWT Bearer Authentication in ASP.NET Core.
- Securing specific routes using the [Authorize] attribute.
Role-Based Authorization
- Restricting access to endpoints based on user roles.

Why API Versioning Matters
- Handling changes in your API over time while maintaining backward compatibility.
Implementing API Versioning
- Using ASP.NET Core's built-in API versioning tools.
- Defining versions in URLs, headers, or query strings (e.g., api/v1/products).

Testing Your API
- Using Postman or Swagger to test your API endpoints manually.
- Writing unit tests for your API controllers using testing frameworks (e.g., xUnit, Moq).
Generating API Documentation with Swagger
- Integrating Swagger (OpenAPI) into your project for automatic API documentation.
- Configuring Swagger to generate interactive documentation of your endpoints.

Publishing Your API
- How to publish your API to a hosting platform (Azure, AWS, Docker, etc.).
- Deploying your API to Azure App Service.
- Containerizing your API using Docker for easier deployment across environments.