Book No 3: API Development Using Asp.Net Core Web API (By Sardar Mudassar Ali khan)
Tags: azure, softwareengineering, software, webdev
Published: 2023-07-22 17:58:03

ASP.NET Core Web API provides a robust framework for building HTTP-based APIs using the ASP.NET Core platform. It enables developers to create RESTful services that can be consumed by various clients, such as web applications, mobile apps, and other services. Below are the key steps to develop an API using ASP.NET Core Web API:

**Step 1: Set Up the Development Environment:**
   - Install the .NET SDK and the required development tools (Visual Studio, Visual Studio Code, or any other code editor of your choice).

**Step 2: Create a New ASP.NET Core Web API Project:**
   - Use the .NET CLI or your preferred development environment to create a new ASP.NET Core Web API project. For example, using the CLI: `dotnet new webapi -n MyWebApi`.

**Step 3: Define API Endpoints:**
   - In the generated project, you'll find a `Controllers` folder. Create new controller classes that will define your API endpoints. Each public method in a controller represents an endpoint.
   - Decorate the controller and its methods with attributes like `[ApiController]` and `[HttpGet]` to specify HTTP methods and other configurations.

**Step 4: Implement API Logic:**
   - Write the logic for each API endpoint inside the corresponding controller methods. This can include fetching data from databases, calling services, or performing any other operations.

**Step 5: Model Binding and Validation:**
   - Use model binding to automatically deserialize incoming request data into C# model classes. ASP.NET Core provides various attribute-based validation options to validate incoming data.

**Step 6: Error Handling:**
   - Implement proper error handling and return appropriate HTTP status codes and error messages when something goes wrong.

**Step 7: Routing:**
   - Configure the routing for your API. By default, ASP.NET Core uses attribute routing, where you define routes using attributes on the controller methods.

**Step 8: Content Negotiation:**
   - ASP.NET Core Web API supports content negotiation, allowing clients to request data in different formats (JSON, XML, etc.). Ensure your API can handle and respond to different content types.

**Step 9: Authentication and Authorization (Optional):**
   - If your API requires authentication and authorization, configure ASP.NET Core's built-in authentication middleware or integrate with third-party authentication providers.

**Step 10: Test Your API:**
   - Write unit tests and integration tests to ensure your API endpoints behave as expected and handle various scenarios.

**Step 11: Documentation (Optional):**
   - Consider using tools like Swagger or OpenAPI to generate API documentation automatically.

**Step 12: Deploy the API:**
   - Publish your ASP.NET Core Web API to a web server or a cloud platform to make it accessible to clients.

Throughout the development process, consider best practices like keeping controllers lean, using dependency injection for better testability, and applying versioning if you anticipate future changes to the API.

Remember that security, scalability, and performance are crucial aspects of API development, so ensure your API implementation aligns with these considerations.

## About The Book 
API Development Using Asp.Net Core Web API in this book we adopted a practical approach for the development of software products. This book is divided into four parts every part has its dimension. This book will explain the fully featured projects and how we can architect the application using the following architectures.
What is Restful Web Service
### Introduction to API Development

1. API Development Using Asp.net Core
2. API Development Using Onion Architecture.
3. API Testing Using Swagger
4. API Testing Using Postman
5. API Deployment on Azure Cloud
6. API Deployment on Hosting Server
###PART 1: API Development Using Asp.net Core

1. Introduction
2. Why Restful Web Service
3. Implementation
4. Conclusion
5. Complete Project GitHub URL
### PART 2: API Development Using Three Tier Architecture.

1. Introduction
2. Complete Understanding of Three Tier Architecture
3. Practical Approach for Architecting the Application with Asp.net Core
4. Conclusion
5. Complete Project GitHub URL
### PART 3: API Development Using Onion Architecture.

1. Introduction
2. Complete Understanding of Onion Architecture
3. Practical Approach for Architecting the Application with Asp.net Core
4. Conclusion
5. Complete Project GitHub URL
### PART 4: API Testing Using Swagger.

1. Introduction
2. API Testing Using Swagger in Asp.net Core
3. Test POST, PUT, DELETE, GET, UPDATE Endpoints Using Swagger
4. Conclusion

### PART 4: API Testing Using Postman.

1. Introduction
2. API Testing Using Postman in Asp.net Core
3. Test POST, PUT, DELETE, GET, UPDATE Endpoints Using Postman
4. Conclusion

### PART 5: Application Deployment on Azure Cloud.

1. Introduction
2. Creation of App on Azure Cloud
3. Server Configuration in Visual Studio
4. Deployment Steps Using Visual Studio
5. Output on Azure Websites
6. Conclusion
### PART 6: Application Deployment on Server.

1. Introduction
2. Deployment Procedure
3. Server Configuration
4. Deployment Steps

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