using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Linq.Expressions;namespace Respository{      /// <summary>    /// 这里T是泛型，（T:class  T是泛型参数。where T : class  是对T的限制，这里的意思是T必须是引用类型，包括任何类、接口、委托或数组类型）    /// </summary>    /// <typeparam name="T"></typeparam>   public interface IRespository<T>where T:class    {       /// <summary>       /// IRespository保存接口       /// </summary>       /// <param name="entity"></param>       /// <returns></returns>        bool SaveEntity(T entity);       /// <summary>       /// IRespository修改接口       /// </summary>       /// <param name="entity"></param>       /// <returns></returns>        bool UpdateEntity(T entity);       /// <summary>        /// IRespository删除       /// </summary>       /// <param name="entity"></param>       /// <returns></returns>        bool DeleteEntity(T entity);         /// <summary>        /// 根据id查询         /// </summary>         /// <param name="Id"></param>         /// <returns></returns>        T GetEntityById(object Id);       /// <summary>       /// 带条件查询       /// </summary>       /// <param name="where"></param>       /// <returns></returns>        T Get(Expression<Func<T, bool>> where);       /// <summary>       /// 查询所有       /// </summary>       /// <returns></returns>        IEnumerable<T> GetALLEntity();       /// <summary>        /// 这里也可以用IEnumerable类型，带条件查询所有       /// </summary>       /// <param name="where"></param>       /// <returns></returns>        IQueryable<T> GetAllEntityWhere(Expression<Func<T, bool>> where);                     /// <summary>       /// 分页       /// </summary>       /// <param name="pageIndex"></param>       /// <param name="PageSize"></param>       /// <returns></returns>        IList<T> GetPageEntities(int pageIndex, int PageSize);       /// <summary>       /// 分页带查询条件       /// </summary>       /// <param name="pageIndex"></param>       /// <param name="PageSize"></param>       /// <param name="where"></param>       /// <returns></returns>        IList<T> GetPageEntities(int pageIndex, int PageSize, Expression<Func<T, bool>> where);    }}然后是Respoistory 对应接口的实现using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Data;using System.Data.Entity;using System.Linq.Expressions;namespace Respository{  public   class Respository<T>:IRespository<T>where T:class    {        //这里首先把DbContext （数据库的上下文给带出来）      public DbContext context;      public Respository(DbContext context)        {            this.context = context;        }      /// <summary>      /// Res保存的方法      /// </summary>      /// <param name="entity"></param>      /// <returns></returns>        public bool SaveEntity(T entity)        {            bool RetStatus = false;            context.Set<T>().Add(entity);            if (Save() > 0)             {                RetStatus = true;            }            return RetStatus;        }      /// <summary>        /// Res修改的方法      /// </summary>      /// <param name="entity"></param>      /// <returns></returns>        public bool UpdateEntity(T entity)        {           // throw new NotImplementedException();            bool RetStatus = false;            if (context.Entry(entity).State == System.Data.Entity.EntityState.Modified)            {                if (Save()> 0)                {                    RetStatus = true;                }            }            return RetStatus;        }      /// <summary>      /// Res删除的方法      /// </summary>      /// <param name="entity"></param>      /// <returns></returns>        public bool DeleteEntity(T entity)        {            //throw new NotImplementedException();            bool RetStatus=false;            if (context.Entry(entity).State == System.Data.Entity.EntityState.Deleted)            {                context.Set<T>().Remove(entity);                if (Save() > 0)                {                    RetStatus = true;                }            }            return RetStatus;        }      /// <summary>        /// 对Set<T>根据id 的查询的操作      /// </summary>      /// <param name="Id"></param>      /// <returns></returns>        public T GetEntityById(object Id)        {            return context.Set<T>().Find(Id);        }      /// <summary>      /// 这里对Set<T>是带条件的操作      /// </summary>      /// <param name="where"></param>      /// <returns></returns>        public T Get(Expression<Func<T, bool>> where)        {            return context.Set<T>().Where(where).FirstOrDefault<T>();        }      /// <summary>      /// 查询所有的      /// </summary>      /// <returns></returns>        public IEnumerable<T> GetALLEntity()        {          //  throw new NotImplementedException();            IEnumerable<T> query = context.Set<T>();            return query;        }      /// <summary>      /// 查询所有带条件      /// </summary>      /// <param name="where"></param>      /// <returns></returns>        public IQueryable<T> GetAllEntityWhere(Expression<Func<T, bool>> where)        {            IQueryable<T> query = context.Set<T>().Where(where);            return query;        }      /// <summary>      /// 分页方法      /// </summary>      /// <param name="pageIndex"></param>      /// <param name="PageSize"></param>      /// <returns></returns>        public IList<T> GetPageEntities(int pageIndex, int PageSize)        {            IList<T> List = context.Set<T>().Skip(pageIndex * PageSize).Take(PageSize).ToList();            return List ;                    }      /// <summary>      /// 分页带查询条件      /// </summary>      /// <param name="pageIndex"></param>      /// <param name="PageSize"></param>      /// <param name="where"></param>      /// <returns></returns>        public IList<T> GetPageEntities(int pageIndex, int PageSize, Expression<Func<T, bool>> where)        {           // throw new NotImplementedException();            IList<T> List = context.Set<T>().Where(where).Skip(pageIndex * PageSize).Take(PageSize).ToList();            return List;        }      /// <summary>      /// Save 保存确认方法      /// </summary>        public int Save()         {            return context.SaveChanges();        }    }}这里我也把实际的调用写出来吧，希望对看到的同学有所帮助我这里是用edmx 生成的一个简单的用户表的model 实列和Dbcontext//------------------------------------------------------------------------------// <auto-generated>//    此代码是根据模板生成的。////    手动更改此文件可能会导致应用程序中发生异常行为。//    如果重新生成代码，则将覆盖对此文件的手动更改。// </auto-generated>//------------------------------------------------------------------------------namespace SSOModel.Models{    using System;    using System.Data.Entity;    using System.Data.Entity.Infrastructure;        public partial class yiliuyangEntities : DbContext    {        public yiliuyangEntities()            : base("name=Entities")        {        }            protected override void OnModelCreating(DbModelBuilder modelBuilder)        {            throw new UnintentionalCodeFirstException();        }            public DbSet<yi_userinfo> yi_userinfo { get; set; }    }}//------------------------------------------------------------------------------// <auto-generated>//    此代码是根据模板生成的。////    手动更改此文件可能会导致应用程序中发生异常行为。//    如果重新生成代码，则将覆盖对此文件的手动更改。// </auto-generated>//------------------------------------------------------------------------------namespace SSOModel.Models{    using System;    using System.Collections.Generic;        public partial class userinfo    {        public int userid { get; set; }        public string username { get; set; }        public string userpwd { get; set; }        public string yusercode { get; set; }        public Nullable<int> usersex { get; set; }        public string userqq { get; set; }        public string usertel { get; set; }    }}然后是EF_Userinfo 方法调用层using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Linq.Expressions;using Respository;using SSOModel.Models;namespace SSOMain.Models{    public class EF_Userinfo    {        Respository<yi_userinfo> EF_Res = new Respository<userinfo>(new Entities());//这里我只写了一个简单的读取方法，是get userinfo 的所有信息        public IList<yi_userinfo> GetUserInfo()         {            return EF_Res.GetALLEntity().ToList();        }    }}最后是HomeControllerusing System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.Mvc;using SSOModel;using Respository;using SSOMain.Models;namespace SSOMain.Controllers{    public class HomeController : Controller    {        //        // GET: /Home/        EF_Userinfo Ef = new EF_Userinfo();        public ActionResult Index()        {            var list = Ef.GetUserInfo();            return View(list.ToList());        }    }}页面我也贴出来的index.cshtml@model  IEnumerable<SSOModel.Models.userinfo>@{    ViewBag.Title = "Index";}<h2>Index</h2><table>    <tr>        <th>            名字        </th>        <th>            密码        </th>    </tr>    @foreach (var item in Model)     {       <tr>           <td>               @item.username           </td>           <td>               @item.userpwd           </td>       </tr>             }</table>