mvc2中viewModel的问题
最近在看原版的Professinal ASP.net MVC 2。在介绍如何在视图中使用ViewModel绑定dropdownlist,但按书上的说法写好View、Controller和DDinnerFormViewModel后,运行时发现提交修改后无法保存更新。没有任何错误提示,就好像修改没有提交到数据库一样。不知道有没有朋友遇到过这种情况?
DinnerFormViewModel.cs代码:
namespace NerdDinner.Controllers
{
public class DinnerFormViewModel
{
private static string[] _countries = new[]
{
"USA",
"UK",
"CHN"
};
public Dinner Dinner { get; private set; }
public SelectList Countries { get; private set; }
public DinnerFormViewModel(Dinner dinner)
{
Dinner = dinner;
Countries = new SelectList(_countries, dinner.Country);
}
}
}
Edit.aspx视图:
<%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<NerdDinner.Controllers.DinnerFormViewModel>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Edit:<%: Model.Dinner.Title %>
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<h2>Edit</h2>
<% using (Html.BeginForm()) {%>
<%: Html.ValidationSummary("Please correct the errors and try again.") %>
<fieldset>
<legend>Fields</legend>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.Title) %>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Dinner.Title, new { size = 30, @class = "myclass", style = "font-color:red;" })%>
<%: Html.ValidationMessageFor(model => model.Dinner.Title, "*")%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.EventDate)%>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Dinner.EventDate)%>
<%: Html.ValidationMessageFor(model => model.Dinner.EventDate, "*")%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.Description)%>
</div>
<div class="editor-field">
<%: Html.TextAreaFor(model => model.Dinner.Description)%>
<%: Html.ValidationMessageFor(model => model.Dinner.Description, "*")%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.Address)%>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Dinner.Address, "*")%>
<%: Html.ValidationMessageFor(model => model.Dinner.Address)%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.Country)%>
</div>
<div class="editor-field">
<%: Html.DropDownListFor(model => model.Dinner.Country, Model.Countries) %>
<%: Html.ValidationMessageFor(model => model.Dinner.Country,"*") %>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.ContactPhone)%>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Dinner.ContactPhone, "*")%>
<%: Html.ValidationMessageFor(model => model.Dinner.ContactPhone)%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.Latitude)%>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Dinner.Latitude, "*")%>
<%: Html.ValidationMessageFor(model => model.Dinner.Latitude)%>
</div>
<div class="editor-label">
<%: Html.LabelFor(model => model.Dinner.Longitude)%>
</div>
<div class="editor-field">
<%: Html.TextBoxFor(model => model.Dinner.Longitude, "*")%>
<%: Html.ValidationMessageFor(model => model.Dinner.Longitude)%>
</div>
<p>
<input type="submit" value="Save" />
</p>
</fieldset>
<% } %>
<div>
<%: Html.ActionLink("Back to List", "Index") %>
</div>
</asp:Content>
DinnersController.cs:
namespace NerdDinner.Controllers
{
public class DinnersController : Controller
{
DinnerRepository Dinners = new DinnerRepository();
public ActionResult Index()
{
var dinners = Dinners.FindUpcomingDinners().ToList();
return View(dinners);
}
public ActionResult Details(int id)
{
Dinner dinner = Dinners.GetDinner(id);
if (dinner == null)
return View("NotFound");
else
return View(dinner);
}
public ActionResult Edit(int id)
{
Dinner dinner = Dinners.GetDinner(id);
return View(new DinnerFormViewModel(dinner));
}
[HttpPost]
public ActionResult Edit(int id, FormCollection formValues)
{
Dinner dinner = Dinners.GetDinner(id);
if (TryUpdateModel(dinner))
{
Dinners.Save();
return RedirectToAction("details", new { id = dinner.DinnerID });
}
return View(new DinnerFormViewModel(dinner));
}
public ActionResult Create()
{
Dinner dinner = new Dinner() {
EventDate = DateTime.Now.AddDays(7)
};
return View(new DinnerFormViewModel(dinner));
}
[HttpPost]
public ActionResult Create(Dinner dinner)
{
if (ModelState.IsValid)
{
dinner.HostedBy = "someuser";
Dinners.Add(dinner);
Dinners.Save();
return RedirectToAction("Details", new { id = dinner.DinnerID });
}
return View(new DinnerFormViewModel(dinner));
}
public ActionResult Delete(int id)
{
Dinner dinner = Dinners.GetDinner(id);
if (dinner == null)
return View("NotFound");
else
return View(dinner);
}
[HttpPost]
public ActionResult Delete(int id, string confirmButton)
{
Dinner dinner = Dinners.GetDinner(id);
if (dinner == null)
return View("NotFound");
Dinners.Delete(dinner);
Dinners.Save();
return View("Deleted");
}
}
}