Question

我已经使用WebAPI和KendoUI创建了一个.NET Core应用程序。我添加了一个通用存储库，当我尝试将数据源添加到Kendo Grid时，我收到以下.ToDataSourceResult()消息的错误：

>不包含以下定义 “ ToDataSourceResult”和最佳扩展方法重载 'QueryableExtensions.ToDataSourceResult（DataTable，DataSourceRequest）' 需要类型为“ DataTable”的接收器

我遵循有关Core和WebApi的Kendo文档来完成此方法，但无法使其正常工作。我已经附加了项目中与此错误和数据相关的代码。

Controllers / HomeController

using Kendo.Mvc.Extensions;
using Kendo.Mvc.UI;
using Microsoft.AspNetCore.Mvc;
using Senua.Interfaces;
using Senua.Models;
using System.Diagnostics;

namespace Senua.Controllers
{
    public class HomeController : Controller
    {
        private IVesselRepository service;

        public IActionResult Index()
        {
            return View();
        }
        [HttpGet]
        public DataSourceResult GetVessels([DataSourceRequest]DataSourceRequest request)
        {
            return service.GetAllVesselsAsync().ToDataSourceResult(request); <----Error appears here.
        }
        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }

    }
}

浏览次数/首页/索引

@(Html.Kendo().Grid<Senua.Models.Vessel>()
    .Name("vessel_grid")
    .Columns(columns =>
    {
        columns.Bound(p => p.Name);
    })
    .Pageable()
    .Filterable()
    .DataSource(dataSource =>
        dataSource
            .WebApi()
            .Events(events => events.Error("error_handler"))
            .Model(model =>
            {
                model.Id(p => p.Id);
            })
            .Read(read => read.Action("GetVessels", "Home"))
          ))

<script>
    function error_handler(e) {
        var errors = $.parseJSON(e.xhr.responseText);
        if (errors) {
            alert("Errors:\n" + errors.join("\n"));
        }
    }
</script>

DAL /船只存储库

using Senua.Interfaces;
using Senua.Models;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;

namespace Senua.DAL
{
    public class VesselRepository : Repository<Vessel>, IVesselRepository
    {
        public VesselRepository(LocalContext repositoryContext)
            : base(repositoryContext)
        {
        }
        public async Task<IEnumerable<Vessel>> GetAllVesselsAsync()
        {
            var vessel = await FindAllAsync();
            return vessel.OrderBy(x => x.Name);
        }
}

接口/ IVessel存储库

using Senua.Models;
using System.Collections.Generic;
using System.Threading.Tasks;

namespace Senua.Interfaces
{
    public interface IVesselRepository
    {
        Task<IEnumerable<Vessel>> GetAllVesselsAsync();
        Task<Vessel> GetVesselByIdAsync(int Id);
        Task CreateVesselAsync(Vessel vessel);
        Task UpdateVesselAsync(Vessel vessel);
        Task DeleteVesselAsync(Vessel vessel);
    }
}

DAL /存储库

using Senua.Interfaces;
using System;
using System.Collections.Generic;
using Microsoft.EntityFrameworkCore;
using System.Linq;
using System.Linq.Expressions;
using System.Threading.Tasks;

namespace Senua.DAL
{
    public abstract class Repository<T> : IRepository<T> where T : class
    {
        protected LocalContext DbContext { get; set; }
        public Repository(LocalContext _context)
        {
            this.DbContext = _context;
        }
        public async Task<IEnumerable<T>> FindAllAsync()
        {
            return await this.DbContext.Set<T>().ToListAsync();
        }        
    }
}

接口/ IRepository

using System;
using System.Collections.Generic;
using System.Linq.Expressions;
using System.Threading.Tasks;

namespace Senua.Interfaces
{
    public interface IRepository<T>
    {
        Task<IEnumerable<T>> FindAllAsync();
        Task<IEnumerable<T>> FindByConditionAsync(Expression<Func<T, bool>> expression);
        void Create(T entity);
        void Update(T entity);
        void Delete(T entity);
        Task SaveAsync();
    }
}

在这方面我需要一些指导，我之前从未设置过异步存储库，因此它是一个新的东西，但是，从我所看到的情况来看，还可以，我已经与邮递员进行了测试。我注意到也有一个'ToDataSourceAsync'，但是在尝试了之后也没有用。

TIA

Answer 1

对于ToDataSourceResult，这是IEnumerable的方法。

对于GetAllVesselsAsync()，它返回一个任务。

尝试下面的代码

[HttpGet]
public async Task<DataSourceResult> GetVessels([DataSourceRequest]DataSourceRequest request)
{
    var result = await service.GetAllVesselsAsync();
    return result.ToDataSourceResult(request); 
}

更新

public class HomeController : Controller
{
    private IVesselRepository service;
    public HomeController(IVesselRepository service)
    {
        this.service = service;
    }

Answer 2

这是我的Kendo MVC网格，需要异步功能。在复杂的情况下，您需要使用异步DataSourceResult来绑定来自api的网格数据：

public class HomeController : Controller
{
    private HttpClient _client = ApiHelper.Client;
    private Uri baseUri = ApiHelper._Client.BaseAddress;

    public ActionResult Index()
    {
        return View();
    }

    DataSourceResult result;
    JsonResult final;
    public async Task<ActionResult> GetList([DataSourceRequest] DataSourceRequest request)
    {
        int offset = 0;
        const int limit = 100;
        List<myModel> myModelList = new List<myModel>();
        using (var req = new HttpRequestMessage(HttpMethod.Get, baseUri + ConfigurationManager.AppSettings["V3BaseUri"] + "resource?offset=" + offset + "&limit=" + limit))
        using (var response = await ApiHelper.Client.SendAsync(req))
        {
             response.EnsureSuccessStatusCode();
                try
                {
                    var content = response.Content.ReadAsStringAsync().Result;
                    myModelList = JsonConvert.DeserializeObject<List<myModel>>(content);
                    result = await myModelList.ToDataSourceResultAsync(request);
                    final = Json(result);
                    return final;
                }
                catch (Exception exc)
                {
                    string message = exc.Message;
                    Console.WriteLine("Exception message: {0}", message);
                    throw;
                }
            }
        }

在我看来：

@(Html.Kendo().Grid<Project.Models.myModel>()
            .Name("grid")
            .AutoBind(true)
            .Columns(columns =>
            {
                columns.Bound(c => c.Id)
                  .Width(80).Title("Entity Id");
                columns.Bound(c => c.NameOfInstitution);
                columns.Bound(c => c.Addresses).ClientTemplate("#=generateAddress(Addresses)#").Title("Address");
                columns.Bound(c => c.InstitutionTelephones).ClientTemplate("#=generatePhone(InstitutionTelephones)#").Title("Phone");

            })
            .HtmlAttributes(new { style = "height: 750px;" })
            .Scrollable()
            .Groupable()
            .Sortable()
            .Pageable()
            .DataSource(dataSource => dataSource
                .Ajax()
                .PageSize(99)
                .Read(read => read.Action("GetList", "Home"))
            ).NoRecords(x => x.Template("<div class='empty-grid'>NO RECORDS</div>")))

是什么导致KendoUI Core应用程序中的ToDataSourceResult错误？

2 个答案: