Telerik Kendo Grid for ASP.Net Core MVC dataSource.read操作错误

Question

我尝试在Razor页面中加载一个简单的网格，但是在页面加载时出现错误。我找不到可以帮助解决此错误的资源。

我确实注意到错误的第二行（请参见下面的完整错误）Kendo.Mvc.UI.Fluent.CrudOperationBuilderBase<TCrudOperationBuilder>.Action(string actionName, string controllerName, object routeValues)表示Action方法期望在controllerName之后传递一个Object，但是所有文档都表明只有Action和控制器名称是必需的。任何见识或帮助将不胜感激。

这是我的错误

System.NullReferenceException: Object reference not set to an instance of an object.

   at Kendo.Mvc.UI.Fluent.CrudOperationBuilderBase<TCrudOperationBuilder>.Action(string actionName, string controllerName, object routeValues)
   at AspNetCore.Views_ExcludeCCNs_Index.<>c.<ExecuteAsync>b__9_3(CrudOperationBuilder read) in C:\Dev\2018.12.07\Prototypes\DBManagementUI\DBManagementUI\Views\ExcludeCCNs\Index.cshtml:line 19
   at Kendo.Mvc.UI.Fluent.AjaxDataSourceBuilderBase<TModel, TDataSourceBuilder>.Read(Action<CrudOperationBuilder> configurator)
   at AspNetCore.Views_ExcludeCCNs_Index.<>c.<ExecuteAsync>b__9_1(DataSourceBuilder<ExcludeCCN> dataSource) in C:\Dev\2018.12.07\Prototypes\DBManagementUI\DBManagementUI\Views\ExcludeCCNs\Index.cshtml:line 17
   at Kendo.Mvc.UI.Fluent.GridBuilder<T>.DataSource(Action<DataSourceBuilder<T>> configurator)
   at AspNetCore.Views_ExcludeCCNs_Index.ExecuteAsync() in C:\Dev\2018.12.07\Prototypes\DBManagementUI\DBManagementUI\Views\ExcludeCCNs\Index.cshtml:line 14
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageCoreAsync(IRazorPage page, ViewContext context)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderPageAsync(IRazorPage page, ViewContext context, Boolean invokeViewStarts)
   at Microsoft.AspNetCore.Mvc.Razor.RazorView.RenderAsync(ViewContext context)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ViewContext viewContext, String contentType, Nullable`1 statusCode)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewExecutor.ExecuteAsync(ActionContext actionContext, IView view, ViewDataDictionary viewData, ITempDataDictionary tempData, String contentType, Nullable`1 statusCode)
   at Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor.ExecuteAsync(ActionContext context, ViewResult result)
   at Microsoft.AspNetCore.Mvc.ViewResult.ExecuteResultAsync(ActionContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultAsync(IActionResult result)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResultFilterAsync[TFilter,TFilterAsync]()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResultExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeResultFilters()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
   at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

这是我的 Kendo网格

@(Html.Kendo().Grid<DBManagementUI.Models.ExcludeCCN>()
    .Name("grid")
    .DataSource(dataSource => dataSource
        .Ajax()
        .Read(read => read.Action("ExcludeCCNs", "ExcludeCCNs"))
    )
    .Columns(columns =>
    {
        columns.Bound(product => product.CCN);
    })
)

这是我的控制器

using Kendo.Mvc.Extensions;
using Kendo.Mvc.UI.Fluent;
using Kendo.Mvc.UI;

namespace Project.Controllers
{
    public class ExcludeCCNsController : Controller
    {
        private readonly CWPAdminContext _context;
        public ExcludeCCNsController(CWPAdminContext context)
        {
            _context = context;
        }

        private IEnumerable<ExcludeCCN> GetExcludeCCNs()
        {
            return _context.ExcludeCCN.Take(100).ToList();
        }

        public IActionResult ExcludeCCNs([DataSourceRequest] 
        DataSourceRequest request)
        {
            return Json(GetExcludeCCNs().ToDataSourceResult(request));
        }

这是我的 Startup.cs文件

public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<CookiePolicyOptions>(options =>
        {
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });

        services.AddEntityFrameworkSqlServer().AddDbContext<ARCHContext>();
        services.AddEntityFrameworkSqlServer().AddDbContext<CWPAdminContext>();
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1)
                         .AddJsonOptions(options => options.SerializerSettings.ContractResolver = new DefaultContractResolver());
}


    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();
        app.UseKendo(env);