static void EditAdvance()
{
     using (StudentSystemEntities dbContext = new StudentSystemEntities())
      {
           // 將EF執(zhí)行的SQL語句輸出到控制臺(tái)
           dbContext.Database.Log += p => Console.WriteLine(p);
           // 創(chuàng)建要修改的對(duì)象
           Student stu = new Student()
           {
                 StudentID = 14,
                 Age = 690
            };
            // 通過上下文獲取對(duì)象相關(guān)信息
            DbEntityEntry<Student> entry = dbContext.Entry<Student>(stu);
            // 對(duì)象的狀態(tài)是沒有修改
            entry.State = System.Data.Entity.EntityState.Unchanged;
            // 對(duì)象的屬性值A(chǔ)ge修改了
            entry.Property("Age").IsModified = true;
            // 保存修改 會(huì)智能判斷哪個(gè)對(duì)象的哪個(gè)屬性值修改了
            dbContext.SaveChanges();
            Console.WriteLine("修改成功");
     }
}

static void DeleteAdvance()
{
     using (StudentSystemEntities dbContext = new StudentSystemEntities())
     {
         // 將EF執(zhí)行的SQL語句輸出到控制臺(tái)
         dbContext.Database.Log += p => Console.WriteLine(p);
         // 先查詢?nèi)缓笤趧h除
         Student stu = new Student()
         {
               StudentID = 14
          };
          DbEntityEntry<Student> entry = dbContext.Entry<Student>(stu);
          entry.State = System.Data.Entity.EntityState.Deleted;
          // 保存,智能判斷對(duì)象的狀態(tài)
          dbContext.SaveChanges();
          Console.WriteLine("刪除成功");
      }
}

static void AddAdvance()
{
     using (StudentSystemEntities dbContext = new StudentSystemEntities())
      {
          // 定義Student對(duì)象
          Student stu = new Student()
          {
               StudentName = "花千骨",
               Sex = "女",
               Age = 3422,
               Major = "舞蹈專業(yè)",
               Email = "2345678911@qq.com"
           };
           // 將EF執(zhí)行的SQL語句輸出到控制臺(tái)
           dbContext.Database.Log += p => Console.WriteLine(p);
           DbEntityEntry<Student> entry = dbContext.Entry<Student>(stu);
           entry.State = System.Data.Entity.EntityState.Added;
            // 保存的數(shù)據(jù)庫
            dbContext.SaveChanges();
            Console.WriteLine("保存成功");
      }
}

static void Save()
{
      using (StudentSystemEntities dbContext = new StudentSystemEntities())
      {
           // 將EF執(zhí)行的SQL語句輸出到控制臺(tái)
           dbContext.Database.Log += p => Console.WriteLine(p);
           // 新增數(shù)據(jù)1
           Student stu1 = new Student()
           {
               StudentName = "紅孩兒",
               Age = 456,
               Major = "冶金專業(yè)"
            };
            dbContext.Students.Add(stu1);

            // 新增數(shù)據(jù)2
            Student stu2 = new Student()
            {
                StudentName = "青牛精",
                Age = 345,
                Major = "煉丹"
             };
             // 使用狀態(tài)
             DbEntityEntry<Student> entry = dbContext.Entry<Student>(stu2);
              entry.State = System.Data.Entity.EntityState.Added;

              // 修改數(shù)據(jù)
              Student stuEdit = new Student()
              {
                    StudentID=5,
                    Age=678
              };
              //狀態(tài)
              DbEntityEntry<Student> entryEdit = dbContext.Entry<Student>(stuEdit);
              entryEdit.State = System.Data.Entity.EntityState.Unchanged;
              entryEdit.Property("Age").IsModified = true;

              // 刪除數(shù)據(jù)
              Student stuDel = new Student()
              {
                   StudentID=22
              };
              DbEntityEntry<Student> entryDel = dbContext.Entry<Student>(stuDel);
              entryDel.State = System.Data.Entity.EntityState.Deleted;

              // 保存
              dbContext.SaveChanges();
              Console.WriteLine("保存成功");
      }
}