Build WEB MVC API with examples

dotnet new webapi -n MyWebAPI

First, you need to have .NET Core SDK installed on your machine. You can download it from the official .NET website if you haven't already: https://dotnet.microsoft.com/download

Once you have .NET Core SDK installed, follow these steps to create a new Web API project:

1. Open a terminal or command prompt.
2. Run the following command to create a new ASP.NET Core Web API project:

dotnet new webapi -n MyWebAPI

This command will create a new directory named MyWebAPI containing the basic structure of a Web API project.

1. Navigate into the project directory:

cd MyWebAPI

Open the project in your preferred code editor. For example, if you're using Visual Studio Code:

code .

Now, let's create a simple API for managing items.

In Controllers directory, you'll find WeatherForecastController.cs. You can rename it to ItemsController.cs and modify it to create an Items API.

Here's an example of ItemsController.cs:

using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc;

namespace MyWebAPI.Controllers
{
    [ApiController]
    [Route("[controller]")]
    public class ItemsController : ControllerBase
    {
        private static List _items = new List();

        [HttpGet]
        public IEnumerable Get()
        {
            return _items;
        }

        [HttpPost]
        public IActionResult Post([FromBody] string item)
        {
            _items.Add(item);
            return Ok();
        }

        [HttpDelete("{item}")]
        public IActionResult Delete(string item)
        {
            if (_items.Contains(item))
            {
                _items.Remove(item);
                return Ok();
            }
            else
            {
                return NotFound();
            }
        }
    }
}

In this controller:

• [ApiController] attribute denotes that this controller will respond to HTTP API requests.
• [Route("[controller]")] specifies that the controller will respond to requests with a route that starts with /items.
• Get() method returns the list of items.
• Post() method adds a new item to the list.
• Delete() method removes an item from the list.

Now, you can run your API by executing the following command in your terminal or command prompt:

dotnet run

Your API will be hosted on http://localhost:5000. You can test the API using tools like Postman or curl. Here are some example requests:

• GET /items: Retrieve the list of items.
• POST /items with JSON body: Add a new item to the list.
• DELETE /items/{item}: Remove a specific item from the list.

That's a basic example of how you can create a Web API using ASP.NET Core MVC. You can expand upon this example by adding more complex logic, database integration, authentication, and authorization as needed.