This course provides a step-by-step introduction to building RESTful services with ASP.NET Web API. You’ll learn the Web API request workflow, HTTP status codes, and API controller concepts, including controllers, attributes, return types, and operations. Through hands-on practice, you’ll build a RESTful API from scratch in ASP.NET Core, gaining the skills to design, implement, and apply Web API concepts with confidence. By the end, you’ll be able to develop and deploy your own RESTful applications effectively.
Who should take this Course?
The ASP.NET Core Web APIs from Scratch Online Course is ideal for beginner to intermediate developers, software engineers, and IT professionals who want to learn how to design, build, and deploy RESTful APIs using ASP.NET Core. It is also suitable for students and aspiring full-stack developers looking to strengthen their backend development skills and gain hands-on experience in creating secure, scalable, and production-ready web APIs.
What you will learn
Build web API operations such as GET, POST, PUT, and DELETE for collections
Know how to improve your ASP .NET MVC Web API project using AutoMapper
Learn to add validations for the models
Learn to create a new web API project from scratch
Master API controller concepts such as controllers and attributes
Implement association APIs using GET and POST
Course Outline
Introduction
Welcome and about the Course
Course Overview
Getting Started
Introduction
Overview of Web API Request Workflow
Overview of Web API Operations
Overview of HTTP Status Code
Overview of CMS OpenAPI Document
Step 1: Create a New Web API Project
Different Parts of a Web API Project
Summary
A Closer Look at API Controllers
Introduction
What are Controllers?
What are Attributes?
Significance of ApiController Attribute
Summary
Implementing Collection APIs
Introduction
STEP 2: Add a New Controller
STEP 3: Add Actions to the Controller
STEP 4: Add Data Models to the Project
STEP 5: Add Database Repository
STEP 6: Use Database Repository
STEP 7: Implement GET Operation to Fetch All Items
Summary
A Closer Look at Return Types
Introduction
Approach 1: Using the Type Directly
Approach 2: Using IActionResult
Approach 3: Using ActionResult<T>
Difference Between IActionResult and ActionResult<T>
Returning the Results Asynchronously
STEP 8: Update GET Operation to Use ActionResult<T>
Summary
Improving Your Web API Project
Introduction
STEP 9: Use AutoMapper to Map Data and DTOs
STEP 10: Implement POST Operation to Add a New Item
STEP 11: Add Validation to Models
Summary
Implementing Individual Item APIs
Introduction
STEP 12: Implement GET Operation to Fetch a Single Item
STEP 13: Implement PUT Operation to Update an Existing Item
STEP 14: Implement DELETE Operation to Delete an Existing Item
Summary
Implementing Association APIs
Introduction
What are Association APIs?
STEP 15: Implement GET Operation to Fetch All Sub-Items
STEP 16: Implement POST Operation to Add a New Association
