using System;using System.Collections.Generic;using System.Data.Entity;using System.Data.Entity.Infrastructure;namespace My{    /// <summary> Entity Framework公共的增删改方法。返回的是受影响的行数 </summary>    public class PublicStore    {       //新增       public static int InsertObject(object obj)        {            Type t = obj.GetType();            int effect = -1;            using (MyContext con = new MyContext())            {                DbSet set = con.Set(t);                set.Add(obj);                effect = con.SaveChanges();                return effect;            }        }                //批量新增        public static int InsertObjects(IEnumerable<object> objs)        {            int effect = 0;            var et = objs.GetEnumerator();            if (et.MoveNext())            {                Type t = et.Current.GetType();                using (MyContext con = new MyContext())                {                    DbSet set = con.Set(t);                    foreach (var o in objs)                    {                        set.Add(o);                    }                    effect = con.SaveChanges();                }            }            return effect;        }                //修改        public static int ModifyObject(object obj)        {            int effect = -1;            using (MyContext con = new MyContext())            {                DbEntityEntry entry = con.Entry(obj);                entry.State = System.Data.EntityState.Modified;                effect = con.SaveChanges();                return effect;            }        }        //批量修改        public static int ModifyObjects(IEnumerable<object> objs)        {            int effect = 0;            var et = objs.GetEnumerator();            if (et.MoveNext())            {                Type t = et.Current.GetType();                using (MyContext con = new MyContext())                {                    foreach (var o in objs)                    {                        DbEntityEntry entry = con.Entry(o);                        entry.State = System.Data.EntityState.Modified;                    }                    effect = con.SaveChanges();                }            }            return effect;        }                //删除        public static int DeleteObject(object obj)        {            int effect = -1;            using (MyContext con = new MyContext())            {                DbEntityEntry entry = con.Entry(obj);                entry.State = System.Data.EntityState.Deleted;                effect = con.SaveChanges();                return effect;            }        }                //批量删除        public static int DeleteObjects(IEnumerable<object> objs)        {            int effect = 0;            var et = objs.GetEnumerator();            if (et.MoveNext())            {                Type t = et.Current.GetType();                using (MyContext con = new MyContext())                {                    foreach (var o in objs)                    {                        DbEntityEntry entry = con.Entry(o);                        entry.State = System.Data.EntityState.Deleted;                    }                    effect = con.SaveChanges();                }            }            return effect;        }    }}