C# EF操作类

using System;
using System.Collections.Generic;
using System.Linq;
using System.Data;
using System.Data.Entity;
using Models;
using System.Linq.Expressions;
using System.Reflection;
using System.Web;
using System.Data.OracleClient;

namespace DAL
{
    public class SortExpression<TEntity, TType>
    {
        Expression<Func<TEntity, TType>> SortProperty;
    }

    public class GenericRepository<TEntity> where TEntity : class
    {
        private Pub p_function = new Pub();

        internal LrBid context;
        internal DbSet<TEntity> dbSet;

        public GenericRepository(LrBid context)
        {
            this.context = context;
            this.dbSet = context.Set<TEntity>();
        }

        public virtual IEnumerable<TEntity> Get(
            Expression<Func<TEntity, bool>> filter = null,
            Func<IQueryable<TEntity>, IOrderedQueryable<TEntity>> orderBy = null,
            string includeProperties = "")
        {
            IQueryable<TEntity> query = dbSet;

            if (filter != null)
            {
                query = query.Where(filter);
            }

            foreach (var includeProperty in includeProperties.Split
                (new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries))
            {
                query = query.Include(includeProperty);
            }

            if (orderBy != null)
            {
                return orderBy(query).ToList();
            }
            else
            {
                return query.ToList();
            }
        }

        public virtual TEntity GetByID(object id)
        {
            return dbSet.Find(id);
        }

        public virtual void Insert(TEntity entity)
        {
                        dbSet.Add(entity);
        }

        public virtual void Delete(object id)
        {
            TEntity entityToDelete = dbSet.Find(id);
            Delete(entityToDelete);
        }

        public virtual void Delete(TEntity entityToDelete)
        {
            if (context.Entry(entityToDelete).State == EntityState.Detached)
            {
                dbSet.Attach(entityToDelete);
            }
            dbSet.Remove(entityToDelete);
        }

        public virtual void Update(TEntity entityToUpdate)
        {
             dbSet.Attach(entityToUpdate);
            context.Entry(entityToUpdate).State = EntityState.Modified;
        }

        
        /// <summary>
        /// 有跟踪状态
        /// </summary>
        /// <param name="query">SQL查询语句，注意ORCALE参数以:为标记，MS SQL以@为标记</param>
        /// <param name="parameters">参数</param>
        /// <returns></returns>
        public virtual IEnumerable<TEntity> GetWithRawSql(string query, params object[] parameters)
        {
            return dbSet.SqlQuery(query, parameters).ToList();
        }

        //
        /// <summary>
        /// 没有跟踪状态
        /// </summary>
        /// <param name="query"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public virtual IEnumerable<TEntity> GetwhithdbSql(string query, params object[] parameters) 
        { 
            return context.Database.SqlQuery<TEntity>(query, parameters); 
        }

        /// <summary>
        /// 获取单行数据，多用于统计
        /// </summary>
        /// <param name="query"></param>
        /// <param name="parameters"></param>
        /// <returns></returns>
        public virtual TEntity GetwhithdbSqlSingle(string query, params object[] parameters)
        {
            return context.Database.SqlQuery<TEntity>(query, parameters).FirstOrDefault();
        }

   }
}

using System;
using Models;

namespace DAL
{
    public class UnitOfWork : IDisposable
    {
      
               //T_ATTACHMENT 
        private GenericRepository<T_ATTACHMENT> t_attachment_Repository;

        public GenericRepository<T_ATTACHMENT> T_ATTACHMENT_Repository
        {
            get
            {

                if (this.t_attachment_Repository == null)
                {
                    this.t_attachment_Repository = new GenericRepository<T_ATTACHMENT>(context);
                }
                return t_attachment_Repository;
            }
        }

 public void Save()
        {
            context.SaveChanges();
        }

        private bool disposed = false;

        protected virtual void Dispose(bool disposing)
        {
            if (!this.disposed)
            {
                if (disposing)
                {
                    context.Dispose();
                }
            }
            this.disposed = true;
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

     }
}