ASPNetCore/TestAppRuna/API/CustomerController.cs

using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Threading.Tasks;
using TestAppRuna.Entities;

// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860

namespace TestAppRuna.API
{
    [Route("api/[controller]")]
    [ApiController]
    public class CustomerController : ControllerBase
    {
        public CustomerController(ShopDbContext shopDbContext)
        {
            ShopDb = shopDbContext;
        }
        public ShopDbContext ShopDb { get; }
        // GET: api/<CustomerController>
        [HttpGet]
        public async Task<IEnumerable<CustomerListItem>> Get()
        {
            var data = await ShopDb.Customers.AsNoTracking()
                .AsNoTracking()
                .Select(Q => new CustomerListItem()
                {
                    CustomerID = Q.CustomerID,
                    Name = Q.Name,
                    Email = Q.Email,
                })
                .OrderBy(Q => Q.Name)
                .ToListAsync();
            return data;
        }

        // GET api/<CustomerController>/5
        [HttpGet("{id}")]
        public async Task<ActionResult<CustomerListItem>> Get(Guid id)
        {
            var data = await ShopDb.Customers
                .AsNoTracking()
                .Where(Q => Q.CustomerID == id)
                .FirstOrDefaultAsync();
            if(data == null)
            {
                return BadRequest();
            }
            return new CustomerListItem()
            {
                CustomerID = data.CustomerID,
                Name = data.Name,
                Email = data.Email,
            };
        }

        // POST api/<CustomerController>
        [HttpPost]
        public async Task<ActionResult<string>> Post([FromBody] CustomerCreateUpdateModel model)
        {
            if(ModelState.IsValid == false)
            {
                return BadRequest();
            }
            var customer = new Customer()
            {
                CustomerID = Guid.NewGuid(),
                Name = model.Name,
                Email = model.Email,
            };
            ShopDb.Customers.Add(customer);
            await ShopDb.SaveChangesAsync();
            return "OK";
        }

        // PUT api/<CustomerController>/5
        [HttpPut("{id}")]
        public async Task<ActionResult<string>> Put(Guid id, [FromBody] CustomerCreateUpdateModel model)
        {
            if(ModelState.IsValid == false)
            {
                return BadRequest();
            }
            var customer = await ShopDb.Customers
                .Where(Q => Q.CustomerID == id)
                .FirstAsync();
            if (customer == null)
            {
                return NotFound();
            }
            customer.Name = model.Name;
            customer.Email = model.Email;
            //ShopDb.Customers.Update(customer);
            await ShopDb.SaveChangesAsync();
            return "OK";
        }

        // DELETE api/<CustomerController>/5
        [HttpDelete("{id}")]
        public async Task<ActionResult<string>> Delete(Guid id)
        {
            var customer = await ShopDb.Customers
                .Where(Q => Q.CustomerID == id)
                .FirstAsync();
            if (customer == null)
            {
                return NotFound();
            }
            ShopDb.Customers.Remove(customer);
            await ShopDb.SaveChangesAsync();
            return "OK";
        }
    }

    public class CustomerListItem
    {
        public Guid CustomerID { get; set; }
        public string Name { get; set; }
        public string Email { get; set; }
    }

    public class CustomerCreateUpdateModel
    {
        [Required]
        [StringLength(255)]
        public string Name { get; set; }
        [Required]
        [StringLength(255)]
        public string Email { get; set; }
    }
}