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  1. 123

    A simple ASP.NET Core Web API can be built using the controller-based approach to handle CRUD operations. Below is a minimal example for a Todo API that demonstrates creating a project, defining a model, repository, and controller.

    1. Create the Project Using Visual Studio or .NET CLI:

    dotnet new webapi -n TodoApi
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    Ensure Use controllers and Enable OpenAPI support are selected if using the Visual Studio template.

    2. Define the Model (Models/TodoItem.cs)

    namespace TodoApi.Models
    {
    public class TodoItem
    {
    public string Key { get; set; }
    public string Name { get; set; }
    public bool IsComplete { get; set; }
    }
    }
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    3. Create a Repository (Models/ITodoRepository.cs and Models/TodoRepository.cs)

    using System.Collections.Generic;

    namespace TodoApi.Models
    {
    public interface ITodoRepository
    {
    void Add(TodoItem item);
    IEnumerable<TodoItem> GetAll();
    TodoItem Find(string key);
    TodoItem Remove(string key);
    void Update(TodoItem item);
    }
    }
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    using System;
    using System.Collections.Concurrent;
    using System.Collections.Generic;

    namespace TodoApi.Models
    {
    public class TodoRepository : ITodoRepository
    {
    private static ConcurrentDictionary<string, TodoItem> _todos = new();

    public TodoRepository()
    {
    Add(new TodoItem { Name = "Item1" });
    }

    public IEnumerable<TodoItem> GetAll() => _todos.Values;

    public void Add(TodoItem item)
    {
    item.Key = Guid.NewGuid().ToString();
    _todos[item.Key] = item;
    }

    public TodoItem Find(string key) => _todos.TryGetValue(key, out var item) ? item : null;

    public TodoItem Remove(string key)
    {
    _todos.TryRemove(key, out var item);
    return item;
    }

    public void Update(TodoItem item) => _todos[item.Key] = item;
    }
    }
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    What are NET Core web API features & code examples?

    In this article, we will discuss .NET Core Web API features and code examples. Key features of web API such as Dependency injection, API versioning, Globalization and Localization, Open API/Swagger Integration, Model Binding and Validation, Routing, Minimal APIs, Cross-Platform Support, Entity Framework Core Integration, etc.

    c-sharpcorner.com
    dotnet-guide.com
    https://www.dotnet-guide.com/tutorials/aspnet-core/build-web-api-dotn…
    ASP.NET Core Fundamentals: Build Web APIs on .NET 8
  1. Microsoft Learn
    https://learn.microsoft.com › en-us › aspnet › core › tutorials › first-web-api

    Tutorial: Create a controller-based web API with ASP.NET Core

    This tutorial teaches the basics of building a controller-based web API that uses a database. Another approach to creating APIs in ASP.NET Core is to create Minimal APIs. For help with choosing between …

    See results only from learn.microsoft.com
  2. C# Corner
    https://www.c-sharpcorner.com › article › ...

    Understanding API in .NET Core — A Beginner-Friendly …

    Oct 6, 2025 · Unlock the power of APIs in .NET Core with this beginner-friendly guide! Learn to build a simple web API, understand endpoints, and connect …

  3. dotnet-guide.com
    https://www.dotnet-guide.com › tutorials › aspnet-core

    ASP.NET Core Fundamentals: Build Web APIs on .NET 8

    Nov 12, 2025 · Learn ASP.NET Core essentials for modern Web APIs on .NET 8—minimal APIs, controllers, DI, auth, EF Core, and deployment. Build a complete Todo API.

  4. Medium
    https://medium.com › @kanishkashm

    How to Build a RESTful Web API in ASP.NET Core (.NET …

    Apr 20, 2025 · In this step-by-step guide, we’ll build a RESTful Web API using ASP.NET Core (.NET 9), covering the basics of routing, controllers, and testing …

  5. Dot Net Tutorials
    https://dotnettutorials.net › lesson › asp-net-core...

    ASP.NET Core Web API Fundamentals - Dot Net Tutorials

    Understand the fundamentals of ASP.NET Core Web API with an Example. Learn to build robust applications with this powerful framework.

  6. Code With Mukesh
    https://codewithmukesh.com › courses › dotnet-webapi...

    Free ASP.NET Core Web API Course - .NET 10, 125

    The .NET Web API Zero to Hero course by Mukesh Murugan is a free, 125+ lesson ASP.NET Core Web API course built on .NET 10. It covers REST API …

  7. Microsoft Learn
    https://learn.microsoft.com › en-us › aspnet › core › web-api

    Create web APIs with ASP.NET Core | Microsoft Learn

    Dec 7, 2025 · ASP.NET Core supports creating web APIs using controllers or using Minimal APIs. Controllers in a web API are classes that derive from …

  8. Github
    https://github.com › Azure-Samples › dotnet-core-api

    Azure-Samples/dotnet-core-api - GitHub

    16 rows · ASP.NET Core API sample for Azure App Service This is a sample application that you can use to follow along with the tutorial at Run a RESTful API …

  9. readthedocs.io
    https://aspnetcore.readthedocs.io › en › stable › ...

    Building Your First Web API with ASP.NET Core MVC …

    In this tutorial, you’ll build a simple web API for managing a list of “to-do” items. You won’t build any UI in this tutorial.

  10. C# Corner
    https://www.c-sharpcorner.com › article › net-core-web...

    .NET Core Web API Features with Code Examples - C

    Jun 30, 2025 · Learn the key features of .NET Core Web API with real code examples. From routing, dependency injection, and middleware to authentication …

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