ASP.NET MVC2 in Action 读书笔记 [4]

Chapter04:

ControllerExamples

Index.aspx:

<h2>Index</h2>
    <%if (TempData.ContainsKey("message"))
      {%>
    <p class="input-validation-success"><%=TempData["message"]%></p>
    <%} %>
    <table>
        <tr>
            <th>
                Username
            </th>
            <th>
                Name
            </th>
        </tr>

    <% foreach (var item in Model) { %>

        <tr>
            <td>
                <%= Html.Encode(item.Username) %>
            </td>
            <td>
                <%= Html.Encode(item.Name) %>
            </td>
        </tr>

    <% } %>

    </table>

Display.aspx:

<h2>Display</h2>

    <fieldset>
        <legend>Fields</legend>
        <p>
            Username:
            <%= Html.Encode(Model.Username) %>
        </p>
        <p>
            Name:
            <%= Html.Encode(Model.Name) %>
        </p>
    </fieldset>

Edit.aspx:

<h2>Edit</h2>


    <% using (Html.BeginForm()) {%>
        <%= Html.ValidationSummary("Edit was unsuccessful. Please correct the errors and try again.") %>

        <fieldset>
            <legend>Fields</legend>
            <p>
                <label for="Username">Username:</label>
                <%= Html.TextBox("Username", Model.Username) %>
                <%= Html.ValidationMessage("Username", "*") %>
            </p>
            <p>
                <label for="FirstName">FirstName:</label>
                <%= Html.TextBox("FirstName", Model.FirstName) %>
                <%= Html.ValidationMessage("FirstName", "*") %>
            </p>
            <p>
                <label for="LastName">LastName:</label>
                <%= Html.TextBox("LastName", Model.LastName) %>
                <%= Html.ValidationMessage("LastName", "*") %>
            </p>
            <p>
                <input type="submit" value="Save" />
            </p>
        </fieldset>

    <% } %>

    <div>
        <%=Html.ActionLink("Back to List", "Index") %>
    </div>

UserController.cs:

public class UserController : Controller
    {
        public ActionResult Index()
        {
            IEnumerable<User> users =
                UserRepository.GetAll();

            UserDisplay[] viewModel = users.Select(
                user => new UserDisplay
                            {
                                Username = user.Username,
                                Name =
                                    user.FirstName + " " +
                                    user.LastName
                            }).ToArray();

            return View(viewModel);
        }

        [HttpGet]
        public ActionResult Display(int Id)
        {
            User user = UserRepository.GetById(Id);

            var viewModel = new UserDisplay
                                {
                                    Username = user.Username,
                                    Name =
                                        user.FirstName + " " +
                                        user.LastName
                                };
            return View(viewModel);
        }

        [HttpGet]
        public ActionResult Edit(int Id)
        {
            User users = UserRepository.GetById(Id);

            var viewModel = new UserInput
                                {
                                    Username =
                                        users.Username,
                                    FirstName =
                                        users.FirstName,
                                    LastName =
                                        users.LastName,
                                };
            return View(viewModel);
        }


        [HttpPost]
        public ActionResult Edit(UserInput input)
        {
            if (ModelState.IsValid)
            {
                UpdateUserFromInput(input);
                TempData["message"] = "The user was updated";
                return RedirectToAction("index");
            }

            return View(input);
        }

        private void UpdateUserFromInput(UserInput input)
        {
            User user =
                UserRepository.GetByUsername(input.Username);
            user.FirstName = input.FirstName;
            user.LastName = input.LastName;
            UserRepository.Save(user);
        }
    }

    public class UserDisplay
    {
        public string Username { get; set; }
        public string Name { get; set; }
    }

    public class UserInput
    {
        [Required]
        public string Username { get; set; }

        public string FirstName { get; set; }
        public string LastName { get; set; }
    }


    public static class UserRepository
    {
        public static IEnumerable<User> GetAll()
        {
            return new[]
                       {
                           new User
                               {
                                   Username = "FFlintstone",
                                   FirstName = "Fred",
                                   LastName = "Flintstone"
                               },
                           new User
                               {
                                   Username = "brubble",
                                   FirstName = "Barney",
                                   LastName = "Rubble"
                               },
                           new User
                               {
                                   Username = "bbrubble",
                                   FirstName = "Bamm-Bamm",
                                   LastName = "Rubble"
                               },
                           new User
                               {
                                   Username = "wilma",
                                   FirstName = "Wilma",
                                   LastName = "Flintstone"
                               },
                           new User
                               {
                                   Username = "pebbles",
                                   FirstName = "Pebbles",
                                   LastName = "Flintstone"
                               },
                           new User
                               {
                                   Username = "dino",
                                   FirstName = "Dino",
                                   LastName = "Flintstone"
                               },
                       };
        }

        public static User GetById(int id)
        {
            if (id == 2)
                return new User();
            return new User
                       {
                           Username = "FFlintstone",
                           FirstName = "Fred",
                           LastName = "Flintstone"
                       };
        }

        public static User GetByUsername(string username)
        {
            return
                GetAll().Where(s => s.Username == username).
                    FirstOrDefault();
        }

        public static void Save(User user)
        {

        }
    }

    public class User
    {
        public string Username { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
    }