J'ai déjà eu des problèmes avec le formulaire de gestion qui contient une liste déroulante. J'ai essayé tout ce que j'ai appris jusqu'ici mais rien n'y fait. Ceci est mon code:
ASP.NET MVC - problème de post-traitement de la liste déroulante
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using CMS;
using CMS.Model;
using System.ComponentModel.DataAnnotations;
namespace Portal.Models
{
public class ArticleDisplay
{
public ArticleDisplay() { }
public int CategoryID { set; get; }
public string CategoryTitle { set; get; }
public int ArticleID { set; get; }
public string ArticleTitle { set; get; }
public DateTime ArticleDate;
public string ArticleContent { set; get; }
}
public class HomePageViewModel
{
public HomePageViewModel(IEnumerable<ArticleDisplay> summaries, Article article)
{
this.ArticleSummaries = summaries;
this.NewArticle = article;
}
public IEnumerable<ArticleDisplay> ArticleSummaries { get; private set; }
public Article NewArticle { get; private set; }
}
public class ArticleRepository
{
private DB db = new DB();
//
// Query Methods
public IQueryable<ArticleDisplay> FindAllArticles()
{
var result = from category in db.ArticleCategories
join article in db.Articles on category.CategoryID equals article.CategoryID
orderby article.Date descending
select new ArticleDisplay
{
CategoryID = category.CategoryID,
CategoryTitle = category.Title,
ArticleID = article.ArticleID,
ArticleTitle = article.Title,
ArticleDate = article.Date,
ArticleContent = article.Content
};
return result;
}
public IQueryable<ArticleDisplay> FindTodayArticles()
{
var result = from category in db.ArticleCategories
join article in db.Articles on category.CategoryID equals article.CategoryID
where article.Date == DateTime.Today
select new ArticleDisplay
{
CategoryID = category.CategoryID,
CategoryTitle = category.Title,
ArticleID = article.ArticleID,
ArticleTitle = article.Title,
ArticleDate = article.Date,
ArticleContent = article.Content
};
return result;
}
public Article GetArticle(int id)
{
return db.Articles.SingleOrDefault(d => d.ArticleID == id);
}
public IQueryable<ArticleDisplay> DetailsArticle(int id)
{
var result = from category in db.ArticleCategories
join article in db.Articles on category.CategoryID equals article.CategoryID
where id == article.ArticleID
select new ArticleDisplay
{
CategoryID = category.CategoryID,
CategoryTitle = category.Title,
ArticleID = article.ArticleID,
ArticleTitle = article.Title,
ArticleDate = article.Date,
ArticleContent = article.Content
};
return result;
}
//
// Insert/Delete Methods
public void Add(Article article)
{
db.Articles.InsertOnSubmit(article);
}
public void Delete(Article article)
{
db.Articles.DeleteOnSubmit(article);
}
//
// Persistence
public void Save()
{
db.SubmitChanges();
}
}
}
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using Portal.Models;
using CMS.Model;
namespace Portal.Areas.CMS.Controllers
{
public class ArticleController : Controller
{
ArticleRepository articleRepository = new ArticleRepository();
ArticleCategoryRepository articleCategoryRepository = new ArticleCategoryRepository();
//
// GET: /Article/
public ActionResult Index()
{
ViewData["categories"] = new SelectList
(
articleCategoryRepository.FindAllCategories().ToList(), "CategoryId", "Title"
);
Article article = new Article()
{
Date = DateTime.Now,
CategoryID = 1
};
HomePageViewModel homeData = new HomePageViewModel(articleRepository.FindAllArticles().ToList(), article);
return View(homeData);
}
//
// GET: /Article/Details/5
public ActionResult Details(int id)
{
var article = articleRepository.DetailsArticle(id).Single();
if (article == null)
return View("NotFound");
return View(article);
}
//
// GET: /Article/Create
//public ActionResult Create()
//{
// ViewData["categories"] = new SelectList
// (
// articleCategoryRepository.FindAllCategories().ToList(), "CategoryId", "Title"
// );
// Article article = new Article()
// {
// Date = DateTime.Now,
// CategoryID = 1
// };
// return View(article);
//}
//
// POST: /Article/Create
[ValidateInput(false)]
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Create(Article article)
{
if (ModelState.IsValid)
{
try
{
// TODO: Add insert logic here
articleRepository.Add(article);
articleRepository.Save();
return RedirectToAction("Index");
}
catch
{
return View(article);
}
}
else
{
return View(article);
}
}
//
// GET: /Article/Edit/5
public ActionResult Edit(int id)
{
ViewData["categories"] = new SelectList
(
articleCategoryRepository.FindAllCategories().ToList(), "CategoryId", "Title"
);
var article = articleRepository.GetArticle(id);
return View(article);
}
//
// POST: /Article/Edit/5
[ValidateInput(false)]
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Edit(int id, FormCollection collection)
{
Article article = articleRepository.GetArticle(id);
try
{
// TODO: Add update logic here
UpdateModel(article, collection.ToValueProvider());
articleRepository.Save();
return RedirectToAction("Details", new { id = article.ArticleID });
}
catch
{
return View(article);
}
}
//
// HTTP GET: /Article/Delete/1
public ActionResult Delete(int id)
{
Article article = articleRepository.GetArticle(id);
if (article == null)
return View("NotFound");
else
return View(article);
}
//
// HTTP POST: /Article/Delete/1
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult Delete(int id, string confirmButton)
{
Article article = articleRepository.GetArticle(id);
if (article == null)
return View("NotFound");
articleRepository.Delete(article);
articleRepository.Save();
return View("Deleted");
}
[ValidateInput(false)]
public ActionResult UpdateSettings(int id, string value, string field)
{
// This highly-specific example is from the original coder's blog system,
// but you can substitute your own code here. I assume you can pick out
// which text field it is from the id.
Article article = articleRepository.GetArticle(id);
if (article == null)
return Content("Error");
if (field == "Title")
{
article.Title = value;
UpdateModel(article, new[] { "Title" });
articleRepository.Save();
}
if (field == "Content")
{
article.Content = value;
UpdateModel(article, new[] { "Content" });
articleRepository.Save();
}
if (field == "Date")
{
article.Date = Convert.ToDateTime(value);
UpdateModel(article, new[] { "Date" });
articleRepository.Save();
}
return Content(value);
}
}
}
et vue:
<%@ Page Title="" Language="C#" MasterPageFile="~/Areas/CMS/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<Portal.Models.HomePageViewModel>" %>
<asp:Content ID="Content1" ContentPlaceHolderID="TitleContent" runat="server">
Index
</asp:Content>
<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
<div class="naslov_poglavlja_main">Articles Administration</div>
<%= Html.ValidationSummary("Create was unsuccessful. Please correct the errors and try again.") %>
<% using (Html.BeginForm("Create","Article")) {%>
<div class="news_forma">
<label for="Title" class="news">Title:</label>
<%= Html.TextBox("Title", "", new { @class = "news" })%>
<%= Html.ValidationMessage("Title", "*") %>
<label for="Content" class="news">Content:</label>
<div class="textarea_okvir">
<%= Html.TextArea("Content", "", new { @class = "news" })%>
<%= Html.ValidationMessage("Content", "*")%>
</div>
<label for="CategoryID" class="news">Category:</label>
<%= Html.DropDownList("CategoryId", (IEnumerable<SelectListItem>)ViewData["categories"], new { @class = "news" })%>
<p>
<input type="submit" value="Publish" class="form_submit" />
</p>
</div>
<% } %>
<div class="naslov_poglavlja_main"><%= Html.ActionLink("Write new article...", "Create") %></div>
<div id="articles">
<% foreach (var item in Model.ArticleSummaries) { %>
<div>
<div class="naslov_vijesti" id="<%= item.ArticleID %>"><%= Html.Encode(item.ArticleTitle) %></div>
<div class="okvir_vijesti">
<div class="sadrzaj_vijesti" id="<%= item.ArticleID %>"><%= item.ArticleContent %></div>
<div class="datum_vijesti" id="<%= item.ArticleID %>"><%= Html.Encode(String.Format("{0:g}", item.ArticleDate)) %></div>
<a class="news_delete" href="#" id="<%= item.ArticleID %>">Delete</a>
</div>
<div class="dno"></div>
</div>
<% } %>
</div>
</asp:Content>
Lorsque vous essayez de poster nouvel article je reçois l'erreur suivante:
System.InvalidOperationException: The ViewData item that has the key 'CategoryId' is of type 'System.Int32' but must be of type 'IEnumerable'.
Je ne sais vraiment pas quoi faire parce que je suis assez nouveau à .net et mvc
Toute aide appréciée!
Ile
EDIT:
J'ai trouvé où je faisais erreur. Je n'ai pas inclus la date. Si sous forme de vue ajouter cette ligne, je suis en mesure d'ajouter l'article:
<%=Html.Hidden("Date", String.Format("{0:g}", Model.NewArticle.Date)) %>
Mais, si je saisis mal DateType ou laisser titre et le contenu vide, je reçois la même erreur. Dans ce cas, il n'est pas nécessaire de modifier la date, mais j'en aurai besoin pour d'autres formulaires et une validation sera nécessaire.
EDIT 2: erreur se produit lors de la publication!
pile d'appel:
App_Web_of9beco9.dll ASP.areas_cms_views_article_create_aspx .__ RenderContent2 (System.Web.UI.HtmlTextWriter __W = {} System.Web.UI.HtmlTextWriter, System.Web.UI.Control parameterContainer = {System.Web. UI.WebControls.ContentPlaceHolder}) ligne 31 + 0x9f octets C#
Aussi, pouvez-vous indiquer si vous obtenez l'erreur lorsque la page est rendue ou lorsque la publication se produit. – Ashok
Une erreur se produit lors de la publication exacte dans la page d'affichage où se trouve la liste déroulante. J'ai édité ma question. –