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文件名称：使用MVC5的Entity Framework 教程源码
文件大小：47.25MB
文件格式：RAR
更新时间：2022-04-06 05:23:22
WEB MVC EF Entity
创建了一个使用实体框架和SQL Server Express LocalDB来存储和显示数据的简单Web应用程序.
实现了基本的CRUD和排序、筛选、分页及分组功能.
using System;
using System.Collections.Generic;
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 PagedList;
namespace ContosoUniversity.Controllers
{
public class StudentsController : Controller
{
private SchoolContext db = new SchoolContext();
// GET: Students
//public ActionResult Index()
//{
// return View(db.Students.ToList());
//}
/* step1
public ActionResult Index(string sortOrder) {
ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
var students = from s in db.Students
select s;
switch (sortOrder) {
case "name_desc":
students = students.OrderByDescending(s => s.LastName);
break;
case "Date":
students = students.OrderBy(s => s.EnrollmentDate);
break;
case "date_desc":
students = students.OrderByDescending(s => s.EnrollmentDate);
break;
default:
students = students.OrderBy(s => s.LastName);
break;
}
return View(students.ToList());
}
*/
/*step2
public ViewResult Index(string sortOrder, string searchString) {
ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
var students = from s in db.Students
select s;
if (!String.IsNullOrEmpty(searchString)) {
students = students.Where(s => s.LastName.Contains(searchString)
|| s.FirstMidName.Contains(searchString));
}
switch (sortOrder) {
case "name_desc":
students = students.OrderByDescending(s => s.LastName);
break;
case "Date":
students = students.OrderBy(s => s.EnrollmentDate);
break;
case "date_desc":
students = students.OrderByDescending(s => s.EnrollmentDate);
break;
default:
students = students.OrderBy(s => s.LastName);
break;
}
return View(students.ToList());
}
*/
public ViewResult Index(string sortOrder, string currentFilter, string searchString, int? page) {
ViewBag.CurrentSort = sortOrder;
ViewBag.NameSortParm = String.IsNullOrEmpty(sortOrder) ? "name_desc" : "";
ViewBag.DateSortParm = sortOrder == "Date" ? "date_desc" : "Date";
if (searchString != null) {
page = 1;
} else {
searchString = currentFilter;
}
ViewBag.CurrentFilter = searchString;
var students = from s in db.Students
select s;
if (!String.IsNullOrEmpty(searchString)) {
students = students.Where(s => s.LastName.Contains(searchString)
|| s.FirstMidName.Contains(searchString));
}
switch (sortOrder) {
case "name_desc":
students = students.OrderByDescending(s => s.LastName);
break;
case "Date":
students = students.OrderBy(s => s.EnrollmentDate);
break;
case "date_desc":
students = students.OrderByDescending(s => s.EnrollmentDate);
break;
default: // Name ascending
students = students.OrderBy(s => s.LastName);
break;
}
int pageSize = 6;
int pageNumber = (page ?? 1);
return View(students.ToPagedList(pageNumber, pageSize));
}
// GET: Students/Details/5
public ActionResult Details(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Student student = db.Students.Find(id);
if (student == null)
{
return HttpNotFound();
}
return View(student);
}
// GET: Students/Create
public ActionResult Create()
{
return View();
}
// POST: Students/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 = "LastName,FirstMidName,EnrollmentDate")] Student student) {
try {
if (ModelState.IsValid) {
db.Students.Add(student);
db.SaveChanges();
return RedirectToAction("Index");
}
}
catch(DataException /* dex */) {
//Log the error (uncomment dex variable name and add a line here to write a log.
ModelState.AddModelError("", "Unable to save changes. Try again, and if the problem persists see your system administrator.");
}
return View(student);
}
// GET: Students/Edit/5
public ActionResult Edit(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
Student student = db.Students.Find(id);
if (student == null)
{
return HttpNotFound();
}
return View(student);
}
// POST: Students/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 = "ID,LastName,FirstMidName,EnrollmentDate")] Student student)
{
if (ModelState.IsValid)
{
db.Entry(student).State = EntityState.Modified;
db.SaveChanges();
return RedirectToAction("Index");
}
return View(student);
}
// GET: Students/Delete/5
public ActionResult Delete(int? id)
{
if (id == null)
{
return new HttpStatusCodeResult(HttpStatusCode.BadRequest);
}
//if (saveChangesError.GetValueOrDefault()) {
// ViewBag.ErrorMessage = "Delete failed. Try again, and if the problem persists see your system administrator.";
//}
Student student = db.Students.Find(id);
if (student == null)
{
return HttpNotFound();
}
return View(student);
}
// POST: Students/Delete/5
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)
{
Student student = db.Students.Find(id);
db.Students.Remove(student);
db.SaveChanges();
return RedirectToAction("Index");
}
protected override void Dispose(bool disposing)
{
if (disposing)
{
db.Dispose();
}
base.Dispose(disposing);
}
}
}