没有为此对象定义无参数构造函数.在ASP.NET MVC控制器中 [英] No parameterless constructor defined for this object. in ASP.NET MVC Controller

问题描述

我确信这很简单，但是我有点卡在这里.为我的应用程序定义的路由只是默认路由.我定义了以下控制器.

I am sure this is quite straightforward but I am a bit stuck here. The routing defined for my app is just the default. I have the following controller defined.

namespace Baynes.Wedding.Web.Controllers
{
    public class AdminController : Controller
    {
        private readonly IAuthProvider _authProvider;
        private readonly IDocumentRepository _documentRepository;

        public AdminController(IAuthProvider authProvider, IDocumentRepository documentRepository)
        {
            _authProvider = authProvider;
            _documentRepository = documentRepository;
        }

        public ViewResult EditDocument(int id)
        {
            var document = _documentRepository.Select(id);

            return View(new DocumentEditViewModel(document));
        }

        [HttpPost]
        public ActionResult EditDocument(DocumentEditViewModel model)
        {
            if (ModelState.IsValid)
            {
                _documentRepository.Update(model.ToDocument());
                return RedirectToAction("ListDocuments");
            }

            return View();
        }
    }
}

当我导航到/Admin/EditDocument/1/时，第一个动作将完全按预期执行，呈现以下视图:-

When I navigate to /Admin/EditDocument/1/ then the first action executes exactly as expected, rendering the following view:-

<h2>@ViewBag.Title</h2>
@using (Html.BeginForm("EditDocument", "Admin", FormMethod.Post)) {
    @Html.ValidationSummary(true)
    @Html.HiddenFor(m => Model.Id)
    <div>
        @Html.LabelFor(m => Model.Title)
    </div>
    <div>
        @Html.TextBoxFor(m => Model.Title)
    </div>
    <div>
        @Html.LabelFor(m => Model.Body)
    </div>
    <div>
        @Html.TextAreaFor(m => Model.Body)
    </div>
    <div>
        @Html.LabelFor(m => Model.Url)
    </div>
    <div>
        @Html.TextBoxFor(m => Model.Url)
    </div>

    <input type="submit" value="Edit" />
}

提交此文件时出现错误:-

On submitting this I get an error:-

No parameterless constructor defined for this object.其他看似相关的问题 MVC:无无参数构造函数为此对象定义的定义表示与IoC容器的设置不正确有关，但是可以肯定的是，第一个操作执行没有问题，这意味着这里不是问题吗?

No parameterless constructor defined for this object. Other questions seemingly related questions MVC: No parameterless constructor defined for this object suggest that it is a to do with the IoC container not being set up properly, but surely the fact that the first action executes without a problem means that isn't the problem here?

任何帮助将不胜感激.

致谢.

西蒙(Simon)

推荐答案

添加到类DocumentEditViewModel的默认构造函数

add to class DocumentEditViewModel default constructor

public DocumentEditViewModel (){}

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