public class CustomDataContext<TEntity> : System.Data.Linq.DataContext

         where TEntity : class,new()

     {

         public CustomDataContext() :

             base(ConfigurationManager.AppSettings["TestDbConnectionString"])

         {

         }

         #region 创建一个新对象

         public bool Create(TEntity entity)

         {

             EntityList.InsertOnSubmit(entity);

             SubmitChanges();

             return true;

         }

         public bool Create(IEnumerable<TEntity> entities)

         {

             EntityList.InsertAllOnSubmit(entities);

             SubmitChanges();

             return true;

         }

         #endregion

         #region 删除一个对象

         public bool Delete(TEntity entity)

         {

             EntityList.DeleteOnSubmit(entity);

             SubmitChanges();

             return true;

         }

         public bool Delete(IEnumerable<TEntity> entities)

         {

             EntityList.DeleteAllOnSubmit(entities);

             SubmitChanges();

             return true;

         }

         #endregion

         #region 修改对象

         public bool Modify(TEntity entity)

         {

             EntityList.Attach(entity, true);

             SubmitChanges();

             return true;

         }

         public bool Modify(IEnumerable<TEntity> entities)

         {

             EntityList.AttachAll(entities, true);

             SubmitChanges();

             return true;

         }

         #endregion

         #region 查询对象

         public TEntity GetEntity(Expression<Func<TEntity, bool>> predicate)

         {

             return EntityList.FirstOrDefault(predicate);

         }

         public IList<TEntity> GetList()

         {

             return EntityList.ToList();

         }

         public IQueryable<TEntity> GetList(Expression<Func<TEntity, bool>> predicate)

         {

             return EntityList.Where(predicate);

         }

         #endregion

         public System.Data.Linq.Table<TEntity> EntityList

         {

             get

             {

                 return this.GetTable<TEntity>();

             }

         }

     }

     [Table(Name = "dbo.DemoClass")]

     public class DemoClass

     {

         public DemoClass()

         {

         }

         [Column(Name = "ID", IsPrimaryKey = true, IsDbGenerated = true)]

         public int ID

         {

             get;

             set;

         }

         [Column(Name = "UserName")]

         public string UserName

         {

             get;

             set;

         }

         [Column(Name = "Phone")]

         public string Phone

         {

             get;

             set;

         }

         [Column(Name = "Email")]

         public string Email

         {

             get;

             set;

         }

         [Column(Name = "Password")]

         public string Password

         {

             get;

             set;

         }

     }

             DemoClass model = new DemoClass();

             model.UserName = "zhagnsan";

             model.Phone = "";

             model.Email = "zhangsan@163.com";

             model.Password = "";

             using (var context = new CustomDataContext<DemoClass>())

             {

                 if (model != null)

                 {

                     context.Create(model);

                 }

             }