C#实体框架EF增删查改

本文素材

ClassInfo表

声明：TestDB6Entities db = new TestDB6Entities();

EF新增

Add

//创建一个班级信息
var classinfo = new ClassInfo()
            {
   
                Name = "2018173807",
                Remark = "七班",
                Term = 2,
                TeacherID = 1
            };
//添加班级信息
db.ClassInfos.Add(classinfo);
//保存
db.SaveChanges();

EntityState.Added

//创建一个班级信息
var classinfo = new ClassInfo()
            {
   
                Name = "2018173807",
                Remark = "七班",
                Term = 2,
                TeacherID = 1
            };
//添加班级信息
db.Entry(classinfo).State = System.Data.Entity.EntityState.Added;
//保存
db.SaveChanges();

AddRange(批量新增)

//创建一个班级集合
List<ClassInfo> classInfos = new List<ClassInfo>() {