asp.net-mvc - KendoUI グリッドが saveChanges イベントを発生させない ( System.MissingMethodException: Cannot create an instance of an interface.)

Question

KendoUI グリッドは SaveChanges イベントを発生しません。プロジェクトを実行して SaveChanges ボタンをクリックしても、Visual Studio 2013 の環境とブラウザー (FF、IE、Chrome) に問題はありませんでしたが、SaveChanges イベントは発生しません。さらに調査するために、Chrome のデバッガーを使用しましたが、問題が発生しました。問題、エラー ログ、およびコードの写真を参照してください。（私はJQuery v1.10を使用しました）解決するのを手伝ってください。

編集:

エラーが関連していることを理解しました。[Bind(Prefix = "models")]削除すると、 Editing_Updateアクションが発生しましたが、articlesオブジェクトはnullでした。どうすれば修正できますか？

Server Error in '/' Application.

Cannot create an instance of an interface.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.MissingMethodException: Cannot create an instance of an interface.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[MissingMethodException: Cannot create an instance of an interface.]   System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& bNeedSecurityCheck) +0   System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +113   System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache, StackCrawlMark& stackMark) +232   System.Activator.CreateInstance(Type type, Boolean nonPublic) +83   System.Activator.CreateInstance(Type type) +66   System.Web.Mvc.DefaultModelBinder.CreateModel(ControllerContext controllerContext, ModelBindingContext bindingContext, Type modelType) +460   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +1137   System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +633   System.Web.Mvc.DefaultModelBinder.UpdateCollection(ControllerContext controllerContext, ModelBindingContext bindingContext, Type elementType) +555   System.Web.Mvc.DefaultModelBinder.BindComplexModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +2486   System.Web.Mvc.DefaultModelBinder.BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext) +633   System.Web.Mvc.ControllerActionInvoker.GetParameterValue(ControllerContext controllerContext, ParameterDescriptor parameterDescriptor) +495   System.Web.Mvc.ControllerActionInvoker.GetParameterValues(ControllerContext controllerContext, ActionDescriptor actionDescriptor) +199   System.Web.Mvc.Async.<>c__DisplayClass1e.<BeginInvokeAction>b__16(AsyncCallback asyncCallback, Object asyncState) +1680   System.Web.Mvc.Async.WrappedAsyncResult`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +59   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +151   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object state, BeginInvokeDelegate beginDelegate, EndInvokeDelegate`1 endDelegate, Object tag, Int32 timeout) +94   System.Web.Mvc.Async.AsyncControllerActionInvoker.BeginInvokeAction(ControllerContext controllerContext, String actionName, AsyncCallback callback, Object state) +525   System.Web.Mvc.Controller.<BeginExecuteCore>b__1c(AsyncCallback asyncCallback, Object asyncState, ExecuteCoreState innerState) +82   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +73   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +151   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext) +105   System.Web.Mvc.Controller.BeginExecuteCore(AsyncCallback callback, Object state) +595   System.Web.Mvc.Controller.<BeginExecute>b__14(AsyncCallback asyncCallback, Object callbackState, Controller controller) +47   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +65   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +151   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext) +139   System.Web.Mvc.Controller.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +484   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.BeginExecute(RequestContext requestContext, AsyncCallback callback, Object state) +50   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__3(AsyncCallback asyncCallback, Object asyncState, ProcessRequestState innerState) +98   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallBeginDelegate(AsyncCallback callback, Object callbackState) +73   System.Web.Mvc.Async.WrappedAsyncResultBase`1.Begin(AsyncCallback callback, Object state, Int32 timeout) +151   System.Web.Mvc.Async.AsyncResultWrapper.Begin(AsyncCallback callback, Object callbackState, BeginInvokeDelegate`1 beginDelegate, EndInvokeVoidDelegate`1 endDelegate, TState invokeState, Object tag, Int32 timeout, SynchronizationContext callbackSyncContext) +106   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +446   System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +88   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +50   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +301   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

私のコントローラーの一部：

[Authorize(Roles = "Administrator")]
    public class ArticleAdminController : MVCController
    {
    private JahanBlogDbContext db = DataContextFactory.GetDataContext();
    private readonly IArticleRepository _articleAdminRepository;
    public ArticleAdminController(IArticleRepository articleRepository)
    {
        _articleAdminRepository = articleRepository;
    }

    public ArticleAdminController()
        : this(new ArticleRepository())
    {
    }

    // GET: ArticleAdmin
    public ActionResult Index([DataSourceRequest] DataSourceRequest request)
    {
        IEnumerable<ArticleViewModel> instance = new ArticleViewModel().FindByCriteria();
        return View(instance);
    }

    public ActionResult Editing_Read([DataSourceRequest] DataSourceRequest request)
    {
        List<ArticleViewModel> instance = new ArticleViewModel().FindByCriteria().ToList();
        DataSourceResult dsRequest = instance.ToDataSourceResult(request);
        return Json(dsRequest, JsonRequestBehavior.AllowGet);
    }

    [AcceptVerbs(HttpVerbs.Post)]
    public ActionResult Editing_Update([DataSourceRequest] DataSourceRequest request, [Bind(Prefix = "models")]IEnumerable<ArticleViewModel> articles)
    {
        if (articles != null && ModelState.IsValid)
        {
            using (new EFUnitOfWorkFactory().Create())
            {
                foreach (ArticleViewModel articleViewModel in articles)
                {
                    var art = new Article
                    {
                        Id = articleViewModel.Id,
                        IsActive = articleViewModel.IsActive,
                        IsActiveNewComment = articleViewModel.IsActiveNewComment,
                        Title = articleViewModel.Title,
                    };
                    _articleAdminRepository.Update(art);
                }
            }
        }
        DataSourceResult result = articles.ToDataSourceResult(request, ModelState);
        return Json(result);

    }
   // ....
  }

上記のコードによると、SaveChanges ボタンをクリックすると、Editing_Update が発生するはずですが、発生しませんでした!!

私のグリッド:

@using Jahan.Blog.ViewModel
@using Kendo.Mvc.UI
@using Jahan.Blog.Web.Mvc.HtmlHelpers
@using Kendo.Mvc.UI.Fluent
@model IEnumerable<ArticleViewModel>
@{
    ViewBag.Title = "Index";
}

<h2>Index</h2>

<p>
    @Html.ActionLink("Create New", "Create")
</p>
<div style="width: 100%;">
    @(Html.Kendo().Grid<Jahan.Blog.ViewModel.ArticleViewModel>()
          .Name("ArticleAdmin").Navigatable()
          .Resizable(c => c.Columns(true))
          .HtmlAttributes(new { @class = "cursorLink", @style = "width: 1600px;height:auto;overflow: scroll;" })
          .Columns(columns =>
          {
              columns.Template(x => { }).ClientTemplate("<a href='" + Url.Action("Details", "ArticleAdmin") + "/#=Id#'>Details</a>").Width(60);
              columns.Bound(p => p.Id).Title("Article Id").Width(75);
              columns.Bound(p => p.Owner).Title("Writer").Width(70);
              columns.Bound(p => p.Title).Width(200);
              columns.Bound(p => p.IsActive).Encoded(false).ClientTemplate("<img src='/Content/#= IsActive ? 'tick.png' : 'cross.png' #''>").Width(80);
              columns.Bound(p => p.IsActiveNewComment).Encoded(false).ClientTemplate("#= showActivationStatusIcon(IsActiveNewComment) #").Width(170);
              columns.Bound(p => p.Tags).ClientTemplate("#= ShowTagsInGridView(Tags) #").Width(200);
              columns.Bound(p => p.NumberOfComments).Title("No. Comments").Width(115);
              columns.Bound(p => p.LikeCounter).Title("No. Like").Width(70);
              columns.Bound(p => p.RateCounter).Title("Rate").Width(60);
              columns.Bound(p => p.CreatedDate).Format("{0:G}").Width(160);
              columns.Bound(p => p.ModifiedDate).Format("{0:G}").Width(160);
              columns.Command(command => command.Destroy()).Width(170);
          })
          .ToolBar(toolbar =>
          {
              toolbar.Create();
              toolbar.Save();
          })
          .Editable(editable => editable.Mode(GridEditMode.InCell))
          .Pageable()
          .Navigatable()
          .Sortable()
          .Scrollable()
          .DataSource(dataSource => dataSource
              .Ajax()
              .Batch(true)
              .PageSize(10)
              .ServerOperation(false)
              .Events(events => events.Error("error_handler"))
              .Model(model =>
              {
                  model.Id(p => p.Id);
                  model.Field(p => p.Id).Editable(false);
                  model.Field(p => p.Tags).Editable(false);
                  model.Field(p => p.Owner).Editable(false);
                  model.Field(p => p.LikeCounter).Editable(false);
                  model.Field(p => p.RateCounter).Editable(false);
                  model.Field(p => p.CreatedDate).Editable(false);
                  model.Field(p => p.ModifiedDate).Editable(false);
              })
              .Create("Editing_Create", "ArticleAdmin")
              .Read(read => read.Action("Editing_Read", "ArticleAdmin"))
              .Update(update => update.Action("Editing_Update", "ArticleAdmin"))
              .Destroy(delete => delete.Action("Editing_Destroy", "ArticleAdmin"))
          ))
</div>

<script type="text/javascript">

    function error_handler(e) {
        if (e.errors) {
            var message = "Errors:\n";
            $.each(e.errors, function (key, value) {
                if ('errors' in value) {
                    $.each(value.errors, function () {
                        message += this + "\n";
                    });
                }
            });
            alert(message);
        }
    }

</script>

私のビューモデル:

namespace Jahan.Blog.ViewModel
{
    public class ArticleViewModel : IArticleViewModel
    {
    public ArticleViewModel()
    {

    }
    public virtual int Id { get; set; }
    public virtual int? UserId { get; set; }

    public virtual string Title { get; set; }

    public virtual string Summary { get; set; }

    public virtual string Description { get; set; }

    public virtual decimal? RateCounter { get; set; }

    public virtual int? LikeCounter { get; set; }

    public virtual bool IsActive { get; set; }

    public virtual bool IsActiveNewComment { get; set; }

    public virtual IList<Comment> Comments { get; set; }

    public virtual ISet<Rating> Ratings { get; set; }

    public virtual IList<AttachmentFile> AttachmentFiles { get; set; }

    public virtual IList<ArticleTag> ArticleTags { get; set; }

    public virtual ISet<ArticleLike> ArticleLikes { get; set; }

    public virtual DateTime? CreatedDate { get; set; }

    public virtual DateTime? ModifiedDate { get; set; }

    //[UIHint("_TagsOfArticle")]
    public List<TagGridViewModel> Tags { get; set; }
    public virtual int NumberOfComments { get; set; }

    public virtual string Owner { get; set; }

    private IQueryable<ArticleViewModel> QueryBuilder()
    {
        ArticleRepository repository = new ArticleRepository();
        IQueryable<ArticleViewModel> query = repository.FindAll().Select(article => new ArticleViewModel
        {
            Id = article.Id,
            //AttachmentFiles = article.AttachmentFiles.Where(a => a.ArticleId == article.Id).Distinct().ToList(),
            //Comments = article.Comments.Where(c => c.ArticleId == article.Id).ToList(),
            CreatedDate = article.CreatedDate,
            Description = article.Description,
            IsActive = article.IsActive,
            IsActiveNewComment = article.IsActiveNewComment,
            LikeCounter = article.LikeCounter,
            ModifiedDate = article.ModifiedDate,
            NumberOfComments = article.Comments.Count(c => c.ArticleId == article.Id),
            RateCounter = article.RateCounter,
            Summary = article.Summary,
            Title = article.Title,
            UserId = article.UserId,
        });
        return query;
    }

    public virtual IQueryable<ArticleViewModel> QueryBuilderByCriteria(Expression<Func<ArticleViewModel, bool>> predicate = null, params Expression<Func<ArticleViewModel, object>>[] includeProperties)
    {
        IQueryable<ArticleViewModel> items = QueryBuilder();
        if (includeProperties != null)
        {
            foreach (Expression<Func<ArticleViewModel, object>> includeProperty in includeProperties)
            {
                items = items.Include(includeProperty);
            }
        }
        if (predicate != null)
            return items.Where(predicate);
        return items;
    }

    public virtual IEnumerable<ArticleViewModel> FindByCriteria(Expression<Func<ArticleViewModel, bool>> predicate = null, params Expression<Func<ArticleViewModel, object>>[] includeProperties)
    {
        List<ArticleViewModel> result = new List<ArticleViewModel>();
        var query = QueryBuilderByCriteria(predicate, includeProperties);
        foreach (var articleViewModel in query)
        {
            articleViewModel.Tags = TagGridViewModel.GetByArticleId(articleViewModel.Id); 
            articleViewModel.Owner = AppUserStore.Instance.FindByIdAsync(int.Parse(articleViewModel.UserId.ToString())).Result.UserName;
            result.Add(articleViewModel);
        }
        return result;
    }

    public virtual ArticleViewModel FindByArticleId(int articleId)
    {
        ArticleViewModel result = QueryBuilder().FirstOrDefault(a => a.Id == articleId);
        return result;
    }
}
}

Answer 1

まず第一に、あなたが提供した写真から、Save Changes が Editing_Update メソッドを起動することが明確に示されています。データの処理中にサーバーが例外をスローしていることを意味するコード 500 を取得しているのはあなただけです。私のアドバイスは、Editing_Update メソッドのコードの最初の行にブレークポイントを置き、それをトリガーするものが見つかるまで F10 キーを押すことです。幸運を

Answer 2

そのためのカスタム モデル バインダーを作成しました。

public class ArticleViewModelBinder : BaseModelBinder<ArticleViewModel>
{
}

BaseModelBinder クラス:

public class BaseModelBinder<TModel> : IModelBinder where TModel : class, new()
    {
        public virtual object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
        {
            TModel model = (TModel)bindingContext.Model ?? new TModel();
            ICollection<string> propertyNames = bindingContext.PropertyMetadata.Keys;
            foreach (var propertyName in propertyNames)
            {
                var value = GetValue(bindingContext, propertyName);
                model.SetPropertyValue(propertyName, value);
            }
            return model;
        }

        private string GetValue(ModelBindingContext context, string name)
        {
            name = (context.ModelName == "" ? "" : context.ModelName + ".") + name;

            ValueProviderResult result = context.ValueProvider.GetValue(name);
            if (result == null || result.AttemptedValue == "")
            {
                return "<Not Specified>";
            }
            else
            {
                return (string)result.AttemptedValue;
            }
        }
    }

ヘルパー クラス:ヘルパー クラスでは、 FastMember を使用しました。

public static class Miscellaneous
    {
        public static void SetPropertyValue(this object obj, string property, object value, bool usingByFastMember = true)
        {
            switch (usingByFastMember)
            {
                case true:
                    var wrapped = ObjectAccessor.Create(obj);
                    var properyType = obj.GetType().GetProperty(property).PropertyType;
                    var val = ChangeType(value, properyType);//Convert.ChangeType(value, properyType);
                    wrapped[property] = val;
                    break;
                case false:
                    PropertyInfo prop = obj.GetType().GetProperty(property, BindingFlags.Public | BindingFlags.Instance);
                    if (prop != null && prop.CanWrite)
                    {
                        prop.SetValue(obj, value, null);
                    }
                    break;
            }
        }

        public static object ChangeType(object value, Type conversion)
        {
            object result = null;
            var t = conversion;

            if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>)))
            {
                if (value == null)
                {
                    return null;
                }
                t = Nullable.GetUnderlyingType(t); ;
            }
            try
            {
                result = Convert.ChangeType(value, t);
            }
            catch (Exception)
            {
                return null;
            }
            return result;
        }
    }