在 ASP.net 中使用多对多关系
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【中文标题】在 ASP.net 中使用多对多关系【英文标题】：Using many to many relationship in ASP.net 【发布时间】：2017-04-12 09:28:15 【问题描述】：我正在尝试使用多对多关系，我成功地编辑和显示了一个客户（我的代码上的名称为“客户”），但我无法创建。 在我的示例中，一个客户（客户）可以是一个或多个社团的一部分。 逐步使用 Visual Studio，我注意到我的值无法传递给我的第一个“创建”函数到第二个。我成功地获得了我想要的领域，但无法发布它们。 我的客户端控制器：
public ActionResult Create()
var cli = new ClientViewModel
Client = new Client()
;
var allSocietesList = db.Societes.ToList();
cli.AllSocietes = allSocietesList.Select(o => new SelectListItem
Text = o.Nom,
Value = o.ID.ToString()
);
ViewBag.StatutClientID = new SelectList(db.StatutClients, "ID", "Designation");
return View(cli);
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create(ClientViewModel client) //Here is where the value dosesn't pass, "client" value is null;
if (ModelState.IsValid)
var cliToAdd = new Client();
var updatedSocietes = new HashSet<int>(client.SelectedSociete);
foreach (Societe societe in db.Societes)
if (updatedSocietes.Contains(societe.ID))
cliToAdd.Societes.Add((societe));
db.Clients.Add(cliToAdd);
db.Entry(cliToAdd).State = System.Data.Entity.EntityState.Added;
db.SaveChanges();
return RedirectToAction("Index");
ViewBag.StatutClientID = new SelectList(db.StatutClients, "ID", "Designation", client.Client.StatutClientID);
return View(client);
现在是我的客户端模型：
namespace CRM.Models
public class Client : Personne // Héritage de la classe Personne
public Client()
this.Societes= new HashSet<Societe>();
[Column("StatutClientID")]
public int StatutClientID get; set;
public string Fonction get; set; // TODO:Type enum
[Display(Name = "Est Actif ?")]
public bool IsActif get; set;
[DataType(DataType.MultilineText)]
public string Commentaire get; set;
public string Fax get; set;
public virtual StatutClient StatutClient get; set;
public virtual ICollection<Societe> Societes get; set;
override public string ToString()
return this.Prenom+" "+this.Nom;
我在控制器中使用的类 ViewModel：
namespace CRM.ViewModels
public class ClientViewModel
public Client Client get; set;
public IEnumerable<SelectListItem> AllSocietes get; set;
private List<int> selectedSociete;
public List<int> SelectedSociete
get
if (selectedSociete == null)
selectedSociete = Client.Societes.Select(m => m.ID).ToList();
return selectedSociete;
set selectedSociete = value;
最后，我的观点：
@model CRM.ViewModels.ClientViewModel
@
ViewBag.Title = "Create";
<h2>Create</h2>
@using (html.BeginForm())
@Html.AntiForgeryToken()
<div class="form-horizontal">
<h4>Client</h4>
<hr />
@Html.ValidationSummary(true, "", new @class = "text-danger" )
<div class="form-group">
@Html.LabelFor(model => model.Client.Nom, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Nom, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Nom, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Prenom, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Prenom, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Prenom, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Fonction, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Fonction, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Fonction, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Commentaire, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Commentaire, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Commentaire, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Telephone, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Telephone, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Telephone, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Mobile, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Mobile, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Mobile, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Fax, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Fax, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Fax, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Mail, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Mail, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Mail, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.IsActif, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
<div class="checkbox">
@Html.EditorFor(model => model.Client.IsActif)
@Html.ValidationMessageFor(model => model.Client.IsActif, "", new @class = "text-danger" )
</div>
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.StatutClientID, "StatutClient", htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.DropDownList("StatutClientID", null, htmlAttributes: new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.StatutClientID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.AllSocietes, "JobTag", new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.ListBoxFor(model => model.SelectedSociete, Model.AllSocietes)
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Create" class="btn btn-default" />
</div>
</div>
</div>
<div>
@Html.ActionLink("Retour à la liste", "Index")
</div>
@section Scripts
@System.Web.Optimization.Scripts.Render("~/bundles/jqueryval")
（我的社团模型（名称“societe”），如果你想知道上面有什么，但问题不是来自这里，你可以跳过它）。
namespace CRM.Models
public class Societe
public Societe()
this.Clients = new HashSet<Client>();
public int ID get; set;
public string Nom get; set;
//[Required] //TODO: renseigner adresse dans les societes de l'initializer
[Display(Name = "Lieu")]
public int LieuID get; set;
public string Adresse get; set;
public int Km get; set;
public string Temps get; set;
public bool IsActif get; set;
public virtual Lieu Lieu get; set;
public virtual ICollection<Affaire> Affaires get; set;
public virtual ICollection<Client> Clients get; set;
为了成功编辑和显示，我遵循了该教程： https://www.codeproject.com/articles/702890/mvc-entity-framework-and-many-to-many-relation
如果我的问题因为我的英语或其他原因而难以理解，请询问:)
编辑：这是我的编辑功能，它是 100% 功能性的：
public ActionResult Edit(int? id)
if (id == null)
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
var clientViewModel = new ClientViewModel
Client = db.Clients.Include(i => i.Societes).First(i => i.ID == id)
;
if (clientViewModel.Client == null)
return HttpNotFound();
var allSocietesList = db.Societes.ToList();
clientViewModel.AllSocietes = allSocietesList.Select(o => new SelectListItem
Text = o.Nom,
Value = o.ID.ToString()
);
ViewBag.StatutClientID = new SelectList(db.StatutClients, "ID", "Designation", clientViewModel.Client.StatutClientID);
return View(clientViewModel);
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Edit(ClientViewModel clientView)
if (clientView == null) return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
if (ModelState.IsValid)
var clientToUpdate = db.Clients
.Include(i => i.Societes).First(i => i.ID == clientView.Client.ID);
if (TryUpdateModel(clientToUpdate, "Client", new string[] "Fonction", "Commentaire", "Nom", "Prenom", "Telephone", "Mobile", "Fax", "Mail", "IsActif", "StatutClientID" ))
// var newJobTags = db.Societes.Where(
// m => clientView.SelectedSociete.Contains(m.ID)).ToList();
var updatedSocietes = new HashSet<int>(clientView.SelectedSociete);
foreach (Societe societe in db.Societes)
if (!updatedSocietes.Contains(societe.ID))
clientToUpdate.Societes.Remove(societe);
else
clientToUpdate.Societes.Add((societe));
db.Entry(clientToUpdate).State = System.Data.Entity.EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
ViewBag.StatutClientID = new SelectList(db.StatutClients, "ID", "Designation", clientView.Client.StatutClientID);
return View(clientView);
与编辑视图相关联：
@model CRM.ViewModels.ClientViewModel
@
ViewBag.Title = "Edit";
<h2 class="well">Clients - Edit</h2>
@using (Html.BeginForm())
@Html.AntiForgeryToken()
<div class="form-horizontal">
@Html.ValidationSummary(true, "", new @class = "text-danger" )
@Html.HiddenFor(model => model.Client.ID)
<div class="form-group">
@Html.LabelFor(model => model.Client.Fonction, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Fonction, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Fonction, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Commentaire, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Commentaire, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Commentaire, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Nom, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Nom, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Nom, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Prenom, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Prenom, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Prenom, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Telephone, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Telephone, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Telephone, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Mobile, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Mobile, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Mobile, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Fax, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Fax, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Fax, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.Mail, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.EditorFor(model => model.Client.Mail, new htmlAttributes = new @class = "form-control" )
@Html.ValidationMessageFor(model => model.Client.Mail, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.IsActif, htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
<div class="checkbox">
@Html.EditorFor(model => model.Client.IsActif)
@Html.ValidationMessageFor(model => model.Client.IsActif, "", new @class = "text-danger" )
</div>
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.Client.StatutClientID, "Client.StatutClientID", htmlAttributes: new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.DropDownListFor(m => m.Client.StatutClientID,
(SelectList)ViewBag.StatutClientID,
Model.Client.StatutClient.ID);
@*Html.DropDownList("Client.StatutClientID", null, htmlAttributes: new @class = "form-control" )*@
@Html.ValidationMessageFor(model => model.Client.StatutClientID, "", new @class = "text-danger" )
</div>
</div>
<div class="form-group">
@Html.LabelFor(model => model.AllSocietes, "JobTag", new @class = "control-label col-md-2" )
<div class="col-md-10">
@Html.ListBoxFor(m => m.SelectedSociete, Model.AllSocietes)
</div>
</div>
<div class="form-group">
<div class="col-md-offset-2 col-md-10">
<input type="submit" value="Save" class="btn btn-default" />
</div>
</div>
</div>
<div>
@Html.ActionLink("Retour à la liste", "Index")
</div>
@section Scripts
@System.Web.Optimization.Scripts.Render("~/bundles/jqueryval")
【问题讨论】：
您是否将需求代码添加到您的数据库上下文中？如：protected override void OnModelCreating(DbModelBuilder modelBuilder) ... 见msdn.microsoft.com/en-us/library/jj591620(v=vs.113).aspx《配置多对多关系》 您好，感谢您的回答。不，我没有这样做，我的代码首先是“数据库”，并且编辑是功能性的，只有在我使用编辑时，我才能为一个客户添加我想要的尽可能多的社会...... 实体不应该自动创建联结表吗？？？ 是的，这是可能的，但我首先创建了联结表，然后更新了我的代码。 这……有点奇怪，我不知道这是不是个好主意。帮不上忙。 【参考方案1】：我能看到的唯一问题是你的观点，其余的对我来说都还可以。
首先，我经常指定表单的发布方式和位置
@using (Html.BeginForm("Action_name", "Controler_name", FormMethod.Post, new role = "form" ))
然后，您还应该将模型的 id 放在页面中。这是我现在总是做的事情。它更加连贯。如果您跳过该部分，您的 id 将不可用，该页面是防止其消失的唯一方法。
类似：
@Html.HiddenFor(t => t.client.id)
将这些用于您希望在不显示的情况下传递回表单的所有模型实例。我不知道它会完全解决您的问题，但这是一个好的开始。
【讨论】：
完成！感谢您的回答，但不幸的是，问题并不明显。我的第二种方法“创造”仍然没有发挥我社会的价值......以上是关于在 ASP.net 中使用多对多关系的主要内容，如果未能解决你的问题，请参考以下文章
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