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   源码介绍

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using System.Data;
using System.Data.Entity;
using System.Linq;
using System.Net;
using System.Web;
using System.Web.Mvc;
using ContosoUniversity.DAL;
using ContosoUniversity.Models;
using System.Data.Entity.Infrastructure;

namespace ContosoUniversity.Controllers
{
    public class CourseController : BaseController
    {
        // GET: Courses
        public ActionResult Index()
        {
            var courses = db.Courses.Include(c => c.Department);
            return View(courses.ToList());
        }

        // GET: Courses/Details/5
        public ActionResult Details(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Course course = db.Courses.Find(id);
            if (course == null)
            {
                return HttpNotFound();
            }
            return View(course);
        }

        private void PopulateDepartmentsDropDownList(object selectedDepartment = null)
        {
            var departmentsQuery = from d in db.Departments
                                   orderby d.Name
                                   select d;
            ViewBag.DepartmentID = new SelectList(departmentsQuery, "DepartmentID", "Name",
                selectedDepartment);
        }

        // GET: Courses/Create
        public ActionResult Create()
        {
            PopulateDepartmentsDropDownList();
            return View();
        }

        // POST: Courses/Create
        // 为了防止“过多发布”攻击，请启用要绑定到的特定属性，有关
        // 详细信息，请参阅 http://go.microsoft.com/fwlink/?LinkId=317598。
        [HttpPost]
        [ValidateAntiForgeryToken]
        public ActionResult Create([Bind(Include = "CourseID,Title,Credits,DepartmentID")] Course course)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    db.Courses.Add(course);
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
            }
            catch (RetryLimitExceededException)
            {
                ModelState.AddModelError("", "无法保存数据，请重试或联系管理员。");
            }

            PopulateDepartmentsDropDownList(course.DepartmentID);
            return View(course);
        }

        // GET: Courses/Edit/5
        public ActionResult Edit(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Course course = db.Courses.Find(id);
            if (course == null)
            {
                return HttpNotFound();
            }
            PopulateDepartmentsDropDownList(course.DepartmentID);
            return View(course);
        }

        // POST: Courses/Edit/5
        // 为了防止“过多发布”攻击，请启用要绑定到的特定属性，有关
        // 详细信息，请参阅 http://go.microsoft.com/fwlink/?LinkId=317598。
        [HttpPost, ValidateAntiForgeryToken]
        public ActionResult Edit([Bind(Include = "CourseID,Title,Credits,DepartmentID")] Course course)
        {
            try
            {
                if (ModelState.IsValid)
                {
                    db.Entry(course).State = EntityState.Modified;
                    db.SaveChanges();
                    return RedirectToAction("Index");
                }
            }
            catch (RetryLimitExceededException)
            {
                ModelState.AddModelError("", "无法保存更改，请重试或联系管理员。");
            }
            PopulateDepartmentsDropDownList(course.DepartmentID);
            return View(course);
        }

        // GET 批量修改成绩
        public ActionResult UpdateCourseCredits()
        {
            return View();
        }

        // POST 批量修改成绩
        [HttpPost]
        public ActionResult UpdateCourseCredits(int? multiplier)
        {
            if (multiplier != null)
            {
                ViewBag.RowsAffected = db.Database.ExecuteSqlCommand(
                    "update course set Credits = Credits * {0}", multiplier);
            }
            return View();
        }

        // GET: Courses/Delete/5
        public ActionResult Delete(int? id)
        {
            if (id == null)
            {
                return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
            }
            Course course = db.Courses.Find(id);
            if (course == null)
            {
                return HttpNotFound();
            }
            return View(course);
        }

        // POST: Courses/Delete/5
        [HttpPost, ActionName("Delete")]
        [ValidateAntiForgeryToken]
        public ActionResult DeleteConfirmed(int id)
        {
            Course course = db.Courses.Find(id);
            db.Courses.Remove(course);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        protected override void Dispose(bool disposing)
        {
            if (disposing)
            {
                db.Dispose();
            }
            base.Dispose(disposing);
        }
    }
}