表单未绑定到正确的对象

Question

我有类似的对象（我正在使用 Model 和 ViewModel，其中 ViewModel 与 Model 对象具有相同的属性）。

当我编辑一个项目时，我为 viewmodel 和处理 update/edit 的控制器放置了编辑器，他接收 ViewModel：

[HttpPost]
public ActionResult Edit(DocumentViewModel model) {
 Mapper.CreateMap < DocumentViewModel, BE.Document > ();
 BE.Document instanceOfDestination = Mapper.Map < BE.Document > (model);

 Container < BE.Document > container = BL.DocumentBL.UpdateDocument(instanceOfDestination);
 if (!container.HasErrors) {
  SetInfo("Saved!");
 } else {
  SetError(container.ErrorMessage);
 }
 return RedirectToAction("Index");
}

问题是此方法永远无法实现，因为模型联编程序构造 BE.Document 而不是 DocumentViewModel。

浏览器发送的值如下：

__RequestVerificationToken:xxx-dontcare
id:36
name:test flash files
documentType.id:5
unit.id:2
reference:FLASH0016
isActive:true
isActive:false
recyclingSpan:1
selectedTopics:1
selectedTopics:2
trainer.id:615952
selectedInstallations:1
selectedInstallations:2
selectedProfessions:3
selectedProfessions:4
selectedProfessions:6

这是 return 虚拟机制作编辑页面的控制器：

[HttpGet]
public ActionResult Edit(int id) {
 var container = BL.DocumentBL.GetAllDocument(new BE.Document() {
  id = id
 });
 if (!container.HasErrors) {
  Mapper.CreateMap < BE.Document, DocumentViewModel > ();
  DocumentViewModel instanceOfDestination = Mapper.Map < DocumentViewModel > (container.Value);
  // fill values for dropdowns and co
  instanceOfDestination.FillPredefinedValuesForUser(GetAdminOrVisibilityUnits());
  return View(instanceOfDestination);
 } else {
  SetError(container.ErrorMessage);
  return RedirectToAction("Index");
 }
}

文档有模型和视图模型：

文档视图模型：

public int id { get; set; }
[Required]
public string name { get; set; }
[Required]
public string reference { get; set; }
[Required]
[Range(0, 100)]
public int recyclingSpan { get; set; }
[Required]
public bool isActive { get; set; }

[DocumentTypeValidator("DocType is required")] // custom validator
public DocumentType documentType { get; set; }
public PersonnelAM trainer { get; set; }
public List<DocumentVersion> versions { get; set; }
public List<Installation> installations { get; set; }
public List<Profession> professions { get; set; }
public List<Topic> topics { get; set; }
public Unit unit { get; set; }

// not used for edit or create
public PersonnelAM createdBy { get; set; }
public DateTime createdOn { get; set; }
public PersonnelAM editedBy { get; set; }
public DateTime editedOn { get; set; }

// to fill dropdowns
public IEnumerable<SelectListItem> documentTypeSelect { get; set; }
public IEnumerable<SelectListItem> personnelSelect { get; set; }
public IEnumerable<SelectListItem> installationsSelect { get; set; }
public IEnumerable<SelectListItem> professionsSelect { get; set; }
public IEnumerable<SelectListItem> topicTypeSelect { get; set; }
public IEnumerable<SelectListItem> unitSelect { get; set; }


// for multi-selects - uses FillListsFromIds to fill Lists from Ids
public int[] selectedProfessions { get; set; }
public int[] selectedInstallations { get; set; }
public int[] selectedTopics { get; set; }

// For file upload
[MinLengthAttribute(1)]
public HttpPostedFileBase[] files { get; set; }
// for file get
public List<string> filesList { get; set; }

BE.Document

public int id { get; set; }
public string name { get; set; }
public string reference { get; set; }
public int recyclingSpan { get; set; }
public bool isActive { get; set; }

public DocumentType documentType { get; set; }
public PersonnelAM trainer { get; set; }
public List<string> filesList { get; set; }
public List<Installation> installations { get; set; }
public List<DocumentVersion> versions { get; set; }
public List<Profession> professions { get; set; }
public List<Topic> topics { get; set; }
public Unit unit { get; set; }

public PersonnelAM createdBy { get; set; }
public DateTime createdOn { get; set; }
public PersonnelAM editedBy { get; set; }
public DateTime editedOn { get; set; }

感谢帮助我:-)

编辑：

这是完整的 Get/id 控制器

[HttpGet]
        public ActionResult Edit(int id)
        {
            if (User.IsInRole("Admin") || User.IsInRole("Moderator") || SessionManager.matricule.IsDocumentCreator(id))
            {
                var container = BL.DocumentBL.GetAllDocument(new BE.Document() { id = id });
                if (!container.HasErrors)
                {
                    Mapper.CreateMap<BE.Document, DocumentViewModel>();
                    DocumentViewModel instanceOfDestination = Mapper.Map<DocumentViewModel>(container.Value);
                    // fill values for dropdowns and co
                    instanceOfDestination.FillPredefinedValuesForUser(GetAdminOrVisibilityUnits());
                    return View(instanceOfDestination);
                }
                else
                {
                    SetError(container.ErrorMessage);
                    return RedirectToAction("Index");
                }
            }
            else
            {
                SetError("Vous n'avez pas le droit d'accéder à l'édition de ce document.");
                return RedirectToAction("Index");
            }
        }

编辑 2：

[HttpPost]
        public ActionResult Edit(DocumentViewModel model)
        {
            if (User.IsInRole("Admin") || User.IsInRole("Moderator") || SessionManager.matricule.IsDocumentCreator(model.id))
            {
                Mapper.CreateMap<DocumentViewModel, BE.Document>();
                BE.Document instanceOfDestination = Mapper.Map<BE.Document>(model);

                Container<BE.Document> container = BL.DocumentBL.UpdateDocument(instanceOfDestination, new PersonnelAM() { id = SessionManager.matricule });
                if (!container.HasErrors)
                {
                    SetInfo("Modifications suavegardées");
                }
                else
                {
                    model.FillPredefinedValuesForUser(GetAdminOrVisibilityUnits());
                    SetError(container.ErrorMessage);
                    return View(instanceOfDestination);
                }
            }
            return RedirectToAction("Index");
        }

Answer 1

请确保将视图模型绑定到您的视图（您的 cshtml 文件），而不是您的模型，在您的视图文件之上（例如 edit.cshtml）：

@model your.namespace.DocumentViewModel

而不是

@model your.namespace.BE.Document

但是，如果视图模型与您的模型相同，为什么还要使用视图模型？为什么不直接使用你的模型呢

Answer 2

您的视图模型绑定正确，但在您的 POST 方法中，这行代码

return View(instanceOfDestination);

正在返回 Document 的实例（由 BE.Document instanceOfDestination = Mapper.Map<BE.Document>(model); 定义，而不是导致异常

的 DocumentViewModel 的实例

The model passed in the dictionary is of type BE.Document but this dictionary requires a model of type DocumentViewModel

改为

return View(model);

以便将正确的类型传递回视图。

表单未绑定到正确的对象

Form is not binding to correct object

c#

asp.net

asp.net-mvc

modelbinders