问题
KendoUI grid does not fire SaveChanges event. I did not see any problem in Environment of Visual Studio 2013 and browsers(FF, IE, Chrome) when I run the project and clicked on SaveChanges button but SaveChanges event does not fire. For further investigation, I've used debugger of Chrome and I saw a problem. Please see the pictures of problem, error log and codes. (I've used JQuery v1.10) Please help me to solve it.
EDITED:
I understood that error has related with [Bind(Prefix = "models")].When I removed it, Editing_Update action be fired but articles object was null. How can I fix it?
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
A part of my Controller:
[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);
}
// ....
}
According to above code, when I click the SaveChanges button, Editing_Update must be fire but did not happen!!
My Grid:
@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>
My ViewModel:
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;
}
}
}
回答1:
First of all from the pictures you've provided it clearly shows that Save Changes does fire the Editing_Update method. only you're getting code 500 which means your server is throwing an exception while proceeding your data. My advice is put a breakpoint on your first line of code in the Editing_Update method and F10 it until you find what triggers it. Good luck
回答2:
I've created a custom model binder for it.
public class ArticleViewModelBinder : BaseModelBinder<ArticleViewModel>
{
}
BaseModelBinder class:
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;
}
}
}
Helper class: In helper class, I've used FastMember.
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;
}
}
来源：https://stackoverflow.com/questions/25859392/kendoui-grid-does-not-fire-savechanges-event-system-missingmethodexception-ca