Exercicio Aula C#

xxx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Newtonsoft.Json;
using PosGraduacao.Models;

namespace PosGraduacao.Controllers
{
    public class ClientController : Controller
    {
        public ActionResult Index()
        {
            var clients = Client.GetClientes();
            return View (clients);
        }

        public ActionResult Create()
        {
            ViewBag.Submitted = false;
            var created = false;

            if (HttpContext.Request.RequestType == "POST") {
                ViewBag.Submitted = true;
				var id = Request.Form["id"];
				var nome = Request.Form["nome"];
				var endereco = Request.Form["endereco"];

                Client client = new Client()
                {
                    ID = Convert.ToInt16(id),
                    Nome = nome,
                    Endereco = endereco
                };

                var ClientFile = Client.ClientFile;
                var ClientData = System.IO.File.ReadAllText(ClientFile);
                List<Client> ClientList = new List<Client>();
                ClientList = JsonConvert.DeserializeObject<List<Client>>(ClientData);

                if (ClientList == null) {
                    ClientList = new List<Client>();
                }

                ClientList.Add(client);
                System.IO.File.WriteAllText(ClientFile, JsonConvert.SerializeObject(ClientList));
                created = true;
            }

            if (created) {
                ViewBag.Message = "Cliente criado com sucesso.";
            } else {
                ViewBag.Message = "Erro ao cadastrar o cliente.";
            }

            return View();
        }

        public ActionResult Update(int id)
        {
            if (HttpContext.Request.RequestType == "POST") {
                var nome = Request.Form["nome"];
                var endereco = Request.Form["endereco"];
                var clients = Client.GetClientes();

                foreach (Client client in clients) {
                    if (client.ID == id) {
                        client.Nome = nome;
                        client.Endereco = endereco;
                        break;
                    }
                }

                System.IO.File.WriteAllText(
                    Client.ClientFile,
                    JsonConvert.SerializeObject(clients)
                );

                Response.Redirect("~/Client/Index?Message=Client_Updated");
            }

            var clnt = new Client();
            var clints = Client.GetClientes();

            foreach (Client client in clints) {
                if (client.ID == id) {
                    clnt = client;
                    break;
                }
            }

            if (clnt == null) {
                ViewBag.Message = "Cliente não encontrado";
            }

            return View(clnt);
        }

        public ActionResult Delete(int id)
        {
            var clients = Client.GetClientes();
            var deleted = false;

			foreach (Client client in clients) {
				if (client.ID == id) {
                    var index = clients.IndexOf(client);
                    clients.RemoveAt(index);
                    System.IO.File.WriteAllText(
                        Client.ClientFile,
                        JsonConvert.SerializeObject(clients)
                    );
                    deleted = true;
                    break;
				}
			}

            if (deleted) {
                ViewBag.Message = "Cliente deletado com sucesso.";
            } else {
                ViewBag.Message = "Erro ao deletar cliente.";
            }

            return View();
        }
    }
}

yyy.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Web;
using Newtonsoft.Json;

namespace PosGraduacao.Models
{
    public class Client
    {
        public static string ClientFile = HttpContext.Current.Server.MapPath(
            "~/App_Data/Clients.json"
        );

        public int ID { get; set; }
        public string Nome { get; set; }
        public string Endereco { get; set; }

        public static List<Client> GetClientes()
        {
            List<Client> clients = new List<Client>();

            if (File.Exists(ClientFile)) {
                string content = File.ReadAllText(ClientFile);
                clients = JsonConvert.DeserializeObject<List<Client>>(content);
            } else {
                File.Create(ClientFile).Close();
                File.WriteAllText(ClientFile, "[]");
            }

            return clients;
        }
    }
}