Hey everybody,

I'm experimenting with the Kendo Forms and I recognized that building/rendering the form with razor all labels showing the property name itself instead the display name I set in the model.

@(Html.Kendo().Form<Provider>()
            .Name("form")
            .Validatable(v =>
            {
                v.ValidateOnBlur(true);
                v.ValidationSummary(vs => vs.Enable(false));
            })
            .Items(items =>
            {
                items.Add().Field(x => x.Description).Editor(x => x.Editor());
                items.Add().Field(x => x.Url);
            })
        )

My model has set a display name for the properties.

    public class Provider
    {
        [Display(Name = "Kurzbeschreibung")]
        public string Description { get; set; }

        [Display(Name = "Link zur Website")]
        public string Url { get; set; }
    }

I am using a nested grid. The nested grid is inside of script tags and looks like this. For some reason when rendering it throws "Unexpected Token '<'. Im unsure why. It renders fine if I pull it out and remove .ToClientTemplate()

<script id="template">
           @(Html.Kendo().Grid<Student>()
               .Name("Student#=Student_ID#")
                 .Width(1500)
                 .HtmlAttributes(new { style="margin-right:20px;height: fit-content;font-size:small" })
                 .Columns(columns =>
                 {
                   columns.Bound(o => o.StudentName).Width(300)
                   columns.Bound(o => o.TimeStamp).Width(300).Title("Date").Format("{0:G}");
                     columns.Bound(o => o.Details).Width(900);

                 })
                 .DataSource(dataSource => dataSource
                    .Ajax()
                    .ServerOperation(false)
                    .PageSize(10)
                    .Read(read => read.Action("GetDetails", "Grid", new{ studentName= "#=StudentName#" }))
                    )
                .Pageable(x => x.Refresh(true))
                .Sortable()
                .ToClientTemplate()
           )

</script>

Is there a way to create an Combobox in the PanelBar header? We want to reload content of the PanelBar after changing the Combobox value.

I haven't found a function or Property like HeaderTemplate() or something similar.

I have a web application that I am adding additional functions to.  The File Manager has just about everything I need (except to hide create folders).  But users have to have the ability to download files. (I kind of don't get how you can have a file manager without the ability to download files.)

Users will upload some CSV files, start a process & at end of process download log files created by the process. 

I see an example of how to extend File Manger but it just doesn't seem to fit the razor page model.  Can anyone point me towards some good examples of how to add that in?

Is Server side paging supported on Treelist control?

It seems like Pager automatically dissaper when ServerOperation flag is true.

Thanks in advance.

In my project asp .Net 5.0 Core, I have the next problem when my page load.

unable to resolve service for type 'kendo.mvc.rendering.kendo html generator'

• Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, bool isDefaultParameterRequired)

• lambda_method29(Closure , IServiceProvider , object[] )

• Microsoft.AspNetCore.Mvc.Infrastructure.TypeActivatorCache.CreateInstance<TInstance>(IServiceProvider serviceProvider, Type implementationType)

• Microsoft.AspNetCore.Mvc.Razor.Infrastructure.DefaultTagHelperActivator.Create<TTagHelper>(ViewContext context)

• Microsoft.AspNetCore.Mvc.Razor.DefaultTagHelperFactory.CreateTagHelper<TTagHelper>(ViewContext context)

• Microsoft.AspNetCore.Mvc.Razor.RazorPageBase.CreateTagHelper<TTagHelper>()

• AspNetCore.Views_AlmacenProductosServicios_Index.ExecuteAsync() in Index.cshtml

  +
  7. ViewData["Title"] = "Listado de productos y servicios";

• Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)

• Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, bool invokeViewStarts)

• Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)

• Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)

• Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, string contentType, Nullable<int> statusCode)

• Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ActionContext actionContext, IView view, ViewDataDictionary viewData, ITempDataDictionary tempData, string contentType, Nullable<int> statusCode)

• Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor.ExecuteAsync(ActionContext context, ViewResult result)

• Microsoft.AspNetCore.Mvc.ViewResult.ExecuteResultAsync(ActionContext context)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResultFilterAsync>g__Awaited|29_0<TFilter, TFilterAsync>(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext<TFilter, TFilterAsync>(ref State next, ref Scope scope, ref object state, ref bool isCompleted)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, object state, bool isCompleted)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(ref State next, ref Scope scope, ref object state, ref bool isCompleted)

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()

• Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)

• Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)

• Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)

• Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

I used the telerik package telerik.ui.for.aspnet.core.2021.2.616

In _ViewImports

@using WASys

@using WASys.Models

@using Kendo.Mvc.UI

@addTagHelper *, Microsoft.AspNetCore.Mvc.TagHelpers

@addTagHelper *, Kendo.Mvc

<kendo-grid name="grid" height="550">

  <columns>

    <column field="ID" title="Order ID">

      <filterable enabled="false"></filterable>

    </column>

    <column field="CodigoInterno" title="Codigo" />

    <column field="NombreLargo" title="Nombre Producto/Servicio" />

    <column field="PrecioCosto" title="Precio Costo" />

  </columns>

  <scrollable enabled="true" />

  <sortable enabled="true" />

  <pageable enabled="true" />

  <filterable enabled="true" />

  <datasource type="DataSourceTagHelperType.Ajax" page-size="20">

    <transport>

      <read url="@Url.Action("Orders_Read", "AlmacenProductosServicios")" />

    </transport>

  </datasource>

</kendo-grid>

I am using the FileManager in ASP.net CORE 5 using the Tag Helpers.  I created a partial view for the FileManager and created a controller to handle the Read, Upload, Destroy, Create.... Currently the read and upload functions work as expected, but when I try to delete a file I Am getting 415 Error using this Tag:

<destroy url="/FileManagerData/Destroy" type="POST"  />

Here is the response:

{"type":"https://tools.ietf.org/html/rfc7231#section-6.5.13","title":"Unsupported Media Type","status":415,"traceId":"00-cd48a67e3165574bb55f025789ec2570-d50282d662ca804c-00"}

After some research the it appears the 415 and Unsupported Media Type is caused by not passing in the Content Type, so I changed the Tag to this:

<destroy url="/FileManagerData/Destroy" type="POST" content-type="multipart/form-data" />

This produced a 400 error with a response of:

{"errors":{"":["Failed to read the request form. Missing content-type boundary."]},"type":"https://tools.ietf.org/html/rfc7231#section-6.5.1","title":"One or more validation errors occurred.","status":400,"traceId":"00-c95edcb44f53ca4aa80654e8ac3f4d6b-80784c169952f14a-00"}

According to you docs the content-type is application/x-www-form-urlencoded which gives me the 415 error.

Here is the Destroy Method from the Controller:

[HttpPost("Destroy")]
        public virtual ActionResult Destroy(FileManagerEntry entry)
        {
            var path = NormalizePath(entry.Path);


            if (!string.IsNullOrEmpty(path))
            {
                if (entry.IsDirectory)
                {
                    DeleteDirectory(path);
                }
                else
                {
                    DeleteFile(path);
                }

                return new JsonResult(new object[0]);
            }
            throw new Exception("File Not Found");
        }

What am I missing here to get this to work?

[UPDATE]

I Change the Destroy Method in the controller to this:

 public virtual ActionResult Destroy([FromForm] FileManagerEntry entry)

Added [FromForm] Which now produces the following validation errors:

{"errors":{"Created":["The value 'Mon Aug 16 2021 10:06:38 GMT-0500 (Colombia Standard Time)' is not valid for Created."],"Modified":["The value 'Mon Aug 16 2021 10:06:38 GMT-0500 (Colombia Standard Time)' is not valid for Modified."],"CreatedUtc":["The value 'Mon Aug 16 2021 10:06:38 GMT-0500 (Colombia Standard Time)' is not valid for CreatedUtc."],"ModifiedUtc":["The value 'Mon Aug 16 2021 10:06:38 GMT-0500 (Colombia Standard Time)' is not valid for ModifiedUtc."]},"type":"https://tools.ietf.org/html/rfc7231#section-6.5.1","title":"One or more validation errors occurred.","status":400,"traceId":"00-5bc6f05eed3360458a9c5f37a37c8f11-27e6c765b081e642-00"}

[UPDATE 1]

I Created my own Model to replace the FileManagerEntry but set all the DateTime Fields to Strings:

public class FileDataJTE
    {

        public string Name { get; set; }
        public string Path { get; set; }
        public string Extension { get; set; }
        public bool IsDirectory { get; set; }
        public bool HasDirectories { get; set; }
        public string Created { get; set; }
        public string CreatedUtc { get; set; }
        public string Modified { get; set; }
        public string ModifiedUtc { get; set; }


    }

Then I Had to pass that in to the Method and convert and string ie Create, back to DateTime:

Why does this not work with the FileManagerEntry on a Controller?

Any ideas on this or am I even on the right track to get this working?

Thanks

--R

Hey guys,

I'm actually new to WebApi and I have a Kendo Grid with the WebApi() option activated:

@(Html.Kendo().Grid<OfferType>()
              .Name("grid")
              .Columns(columns =>
              {
                  columns.Bound(p => p.Name);
                  columns.Command(command => { command.Edit(); });
              })
              .DataSource(dataSource =>
                  dataSource
                    .WebApi()
                    .Model(model =>
                    {
                        model.Id(p => p.ID);
                    })
                    .Events(events => events.Error("error_handler"))
                    .Read(read => read.Url("https://localhost:44362/api/OfferType"))
                    .Update(update => update.Url("https://localhost:44362/api/OfferType/{0}"))
              )
              .Pageable()
              .Sortable()
	)

In your demo für .NET Core you're using the view inside a webapi-project. This is not my case. I'm using the grid in a project which has to be connected to a webapi outside the project/solution. Therefore I have to use "read => read.Url("xyz")" (I think) to get connection to my outside hosted webapi. Because via "read.Action(x,y)" I can't refer to other projects/solutions and urls.

The controller of my webapi is looking like that:

    [Route("api/[controller]")]
    [ApiController]
    public class OfferTypeController : ControllerBase
    {
        private readonly FrueheHilfenContext _context;

        public OfferTypeController(FrueheHilfenContext context)
        {
            _context = context;
        }



        [HttpGet]
        [EnableCors("AllowLocal")]
        public DataSourceResult Get([DataSourceRequest] DataSourceRequest request)
        {
            List<OfferType> returnList = new List<OfferType>();
            using (_context)
            {
                returnList = _context.OfferTypes.ToList();
            }
            
            return returnList.ToDataSourceResult(request);
        }

        // PUT api/<OfferTypeController>/5
        [HttpPut("{id}")]
        [EnableCors("AllowLocal")]
        public IActionResult Put(int id, OfferType offerType)
        {
            if (ModelState.IsValid && id == offerType.ID)
            {
                try
                {
                    using (_context)
                    {
                        _context.Entry(offerType).State = EntityState.Modified;
                        _context.SaveChanges();
                    }
                }
                catch (DbUpdateConcurrencyException)
                {
                    return new NotFoundResult();
                }

                return new StatusCodeResult(200);
            }
            else
            {
                return BadRequest(ModelState.Values.SelectMany(v => v.Errors).Select(error => error.ErrorMessage));
            }
        }
    }

Getting data is working like expected. But I have problems to update my data via put. The console is giving me the errorcode 415 "unsupported media type". When debugging my webapi project the put actions is never been called. So I think there is something wrong with my setup of the grid.

Edit: I know why I'm getting the 415 error (see my answer in the comments). I found out that when I expect a datasourcerequest as an argument in the put-action (so a "[DataSourceRequest] DataSourceRequest offerType" instead of a "OfferType offerType") the action is successfully called without errors. But with the datasourcerequest there aren't any infos about my updated object in the grid. So my grid isn't sending the updated object but the metadata of the grid.

Is anybody seeing my mistake?