iot/projects/StudyCenter/Controllers/CourseController.cs

using System.Linq;
using Application.Domain.Entities;
using Application.Models;
using Infrastructure.Data;
using Infrastructure.Extensions;
using Infrastructure.Web;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;

namespace StudyCenter.Controllers
{
    public class CourseController : BaseController
    {
        private readonly IRepository<CourseCategory> _courseCategoryRepo;
        private readonly IRepository<Course> _courseRepo;

        public CourseController(IRepository<CourseCategory> courseCategoryRepo, IRepository<Course> courseRepo)
        {
            this._courseCategoryRepo = courseCategoryRepo;
            this._courseRepo = courseRepo;
        }

        public IActionResult Index(CourseModel model)
        {
            var categoyies = this._courseCategoryRepo.ReadOnlyTable().Include(o => o.Parent).ToList();
            model.Categories = categoyies;
            var query = this._courseRepo.ReadOnlyTable();
            if (model.CategoryId.HasValue)
            {
                var category = categoyies.FirstOrDefault(o => o.Id == model.CategoryId.Value);
                query = query.Where(o => o.Category.Path.StartsWith(category.Path));
            }
            query = query.OrderBy(o => o.Category.DisplayOrder)
                .ThenBy(o => o.Category.Number)
                .ThenBy(o => o.DisplayOrder)
                .ThenBy(o => o.Number);
            model.TotalCount = query.Count();
            model.List = query.Paged(model.PageIndex, model.PageSize);
            foreach (var item in model.List)
            {
                item.Category = categoyies.FirstOrDefault(o => o.Id == item.CategoryId);
            }
            return View(model);
        }
    }
}