public T AddEntity(T entity)

{

    //EF4.0的写法

    添加实体

    //db.CreateObjectSet<T>().AddObject(entity);

    //EF5.0的写法

    db.Entry<T>(entity).State = EntityState.Added;

    //下面的写法统一

    db.SaveChanges();

    return entity;

}

public bool UpdateEntity(T entity)

{

    //EF4.0的写法

    //db.CreateObjectSet<T>().Addach(entity);

    //db.ObjectStateManager.ChangeObjectState(entity, EntityState.Modified);

    //EF5.0的写法

   db.Set<T>().Attach(entity);

   db.Entry<T>(entity).State = EntityState.Modified;

   return db.SaveChanges() > ;

}

public bool DeleteEntity(T entity)

{

    //EF4.0的写法

   //db.CreateObjectSet<T>().Addach(entity);

   //db.ObjectStateManager.ChangeObjectState(entity, EntityState.Deleted);

   //EF5.0的写法

   db.Set<T>().Attach(entity);

   db.Entry<T>(entity).State = EntityState.Deleted;

   return db.SaveChanges() > ;

}

public IQueryable<T> LoadEntities(Func<T, bool> whereLambda)

{

    //EF4.0的写法

    //return db.CreateObjectSet<T>().Where<T>(whereLambda).AsQueryable();

    //EF5.0的写法

    return db.Set<T>().Where<T>(whereLambda).AsQueryable();

}

执行SQL语句

//EF4.0的写法

//int ExcuteSql(string strSql, ObjectParameter[] parameters);

return EFContextFactory.GetCurrentDbContext().ExecuteFunction(strSql, parameters);

//EF5.0的写法

 int ExcuteSql(string strSql, DbParameter[] parameters);

return DEFContextFactory.GetCurrentDbContext().ExecuteSqlCommand(strSql, parameters);