Hi Pavlina

Any idea when me might see some preview builds for this?  We've got a project we're in the middle of switching over to Core 3 that relies heavily on the Telerik controls, this is proving a bit of a blocker for us.

Thanks

Tom

This is great news, thank you Milena. One further question. My project also uses the Reporting library is that also available for 3.0 testing as well?

Thank you,

Scott

Milena,

I upgraded my app and while the Telerik.Reporting library does not cause any issues what does cause my program to not compile is the Telerik.Reporting.Services.AspNetCore library. With this added via Nuget the compilation will fail with the following message:

ErrorCS0579Duplicate 'Microsoft.AspNetCore.Mvc.ApplicationParts.ProvideApplicationPartFactoryAttribute' attributeASPNetCore3Preview3c:\temp\ASPNetCore3Preview3\ASPNetCore3Preview3\obj\Debug\netcoreapp3.0\ASPNetCore3Preview3.RazorTargetAssemblyInfo.cs16Active

I think there must be something in that referencing some part of 2.2 still. This library is required as it contains the ReportControllerBase that needs to be inherited from for reporting to work in ASP.Net Core.

Any thoughts?

Thanks,

Scott

Hello Ivan,

Thanks for the response. A little disappointing after spending time on the conversion but I understand completely how this might happen. Best of luck on the REST library, looking forward to using it.

Also, thanks for the great products you folks put out!

Regards,

Scott

So....I can compile successfully compile my application now, but am unable to get reporting to work with it under 3.0. So, to try and work things out, I took the netcore sample that came with the 2019.2 download but was unable to convert it to 3.0 and have it work properly either. Any chance of getting a sample for 3.0 Preview 5 that shows what exactly needs to change? Or at least some thoughts on what I should look into.

Thank you,

Scott

Outstanding, thank you so much, Peter!

Regards,

Scott

Hi Telerik Team,

I installed Visual studio 2019 with .net core 3.0 preview version. I need to migrate MVC project having kendo controls to ASP.NET Core 3.0. I went to telerik site, and install the installer for TelerikUIForAspNetCoreSetup.exe and telerik.ui.for.aspnet.core.2019.2.619.commercial.msi to install this in visual studio, and i am able to do it successfully too.

However, when i choose a new project with template "TelerikUIForAspNetCore". it gives me option for core 2.2 only and not 3.0 and henece i cannot move further. I attach the screenshot too. Please can anyone help me urgently.

Thanks Denitsa for the update.

Please tell us the timeline if scheduled, when it will release? The official .NET Core 3.0 stable version is scheduled for september though.

Hi,

I couldn't find any preview of the release.

Since for every "DataSourceRequest" model binding attempt, this error is risen

System.TypeLoadException: Could not load type 'Microsoft.AspNetCore.Mvc.ModelBinding.Internal.ModelBindingHelper' from assembly 'Microsoft.AspNetCore.Mvc.Core, Version=3.0.0.0, Culture=neutral, PublicKeyToken=adb9793829ddae60'. at Kendo.Mvc.Extensions.ValueProviderResultExtensions.ConvertValueTo(ValueProviderResult result, Type type) at Kendo.Mvc.UI.DataSourceRequestModelBinder.TryGetValue[T](ModelMetadata modelMetadata, IValueProvider valueProvider, String modelName, String key, Action`1 action) at Kendo.Mvc.UI.DataSourceRequestModelBinder.CreateDataSourceRequest(ModelMetadata modelMetadata, IValueProvider valueProvider, String modelName) at Kendo.Mvc.UI.DataSourceRequestModelBinder.BindModelAsync(ModelBindingContext bindingContext) at Microsoft.AspNetCore.Mvc.ModelBinding.Binders.BinderTypeModelBinder.BindModelAsync(ModelBindingContext bindingContext) at Microsoft.AspNetCore.Mvc.ModelBinding.ParameterBinder.BindModelAsync(ActionContext actionContext, IModelBinder modelBinder, IValueProvider valueProvider, ParameterDescriptor parameter, ModelMetadata metadata, Object value) at Microsoft.AspNetCore.Mvc.Controllers.ControllerBinderDelegateProvider.<>c__DisplayClass0_0.<<CreateBinderDelegate>g__Bind|0>d.MoveNext() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.<InvokeInnerFilterAsync>g__Awaited|13_0(ControllerActionInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Logged|17_1(ResourceInvoker invoker) at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext) at EFS.Web.Extensions.ExceptionMiddleware.InvokeAsync(HttpContext httpContext) in C:\temp\repos\3FS\EFS.Web\Infrastructure\Extensions\ExceptionMiddleware.cs:line 24 at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Session.SessionMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

I think older version can't be used in any 3.0 project 

Hi Marco,

You could Create New Telerik Project with Grid for .NET Core 3.0. It is available in the latest version of Telerik ASP.NET Core VSExtension.

The created sample project contains DataSourceRequest.

I hope this will help you.  

Regards,
Denitsa
Progress Telerik

Hello,

Out of the box, using the 'Telerik UI for ASP.NET Core' -> Create New Telerik Project (Grid and Menu) in Visual Studio 2019 + .NET Core 3.0 does not appear to work correctly. The project will get created and will build and run correctly, however when I try to add a new View or Controller I will get the attached error. I kept adding libraries that the error was complaining about until it worked, however I'm not sure this was the correct way to go about fixing this (see attached). 

Is there a reason the out of the box extension to create a project is not working?

I've submitted a bug regarding this as well. 

Thanks,

Dave

Hello Dave,

We tried to reproduce the problem by creating new Telerik Project and then following basic Microsoft tutorial. No errors appeared. 

We have released 2019.3.1023 (R3 2019 SP1), which fixes a conflict issue between Telerik.UI.for.AspNet.Core and ASP.NET Core 3.0. You could try it out.

If the probplem remains could you confirm it is not reproducible with ASP.NET Core 2.2, but only with ASP.NET Core 3.0? 

Regards,
Denitsa
Progress Telerik

Hi,

After upgrade to .Net core 3.0, Kendo Html grid displays the data as undefined.

I was required to change my controller action (as part of .Net core 3.0 upgrade)From: return Json(datatable..ToDataSourceResult(request)); To: return Json(datatable.AsEnumerable().ToDataSourceResult(request));

As a result of it my controller response changed as mentioned below

Before Upgrade:
Response:{"Data":[{"Id":"bef5a32f-c5f3-4b8c-99be-66a55c54358e","Filename":"Obligations Register monthly update in depth training .ics","FileType":".ics","Folder":"TEST 24-09-19","FileSize":"0.0065

After Upgrade:
{"Data":[{"RowError":"","RowState":4,"Table":[{"Id":"05467393-5338-4497-b570-ac48d35488b0","Filename":"Kndo-GridQuery (1) (1).docx","FileType":".docx","Folder":"Test0811","FileSize":"0.21

Hi John,

Thank you for sharing your feedback. 

Indeed migrating from ASP.NET Core 2.2 to 3.0 might be a complicated process. Here are the main articles by Microsoft that should be considered when Migrate from ASP.NET Core 2.2 to 3.0  and Breaking changes introduced.

Regards,
Denitsa
Progress Telerik

Hi John,

We have modified the method ToDataSourceResult() so it could be used with DataTable in ASP.NET Core 3.0 as in  ASP.NET Core 2.2.

It is available in the latest Internal Build (2019.3.1219) and in the next Official Release that is expected in the middle of January 2020.

Regards,
Denitsa
Progress Telerik