MVC+LINQToSQL的Repository模式之(三）Repository模式实现统一CURD操作，实现EF中的Find主键查找

{
    /// <summary>
    /// 数据通用操作实现
    /// </summary>
    /// <typeparam name="TEntity"></typeparam>
    public class Repository<TEntity> : TESTRepositoryBase, IRepository<TEntity> where TEntity : class,IEntity
    {
        #region IRepository<TEntity> 成员

        public void Update(TEntity entity)
        {
            TEntity originalEntity = this.Find(entity.PrimaryKey);
            EmitMapper.ObjectMapperManager.DefaultInstance.GetMapper<TEntity, TEntity>().Map(entity, originalEntity);
            base.SubmitChanges();
        }

        public void Update(IList<TEntity> list)
        {
            TEntity originalEntity = null;
            list.ToList().ForEach(entity =>
            {
                originalEntity = this.Find(entity.PrimaryKey);
                EmitMapper.ObjectMapperManager.DefaultInstance.GetMapper<TEntity, TEntity>().Map(entity, originalEntity);
            });
            base.SubmitChanges();
        }

        public void Insert(TEntity entity)
        {
            this._db.GetTable<TEntity>().InsertOnSubmit(entity);
            base.SubmitChanges();
        }

        public void Insert(IList<TEntity> list)
        {
            list.ToList().ForEach(entity =>
            {
                this._db.GetTable<TEntity>().InsertOnSubmit(entity);
            });
            base.SubmitChanges();
        }

        public TEntity InsertGetIDENTITY(TEntity entity)
        {
            this._db.GetTable<TEntity>().InsertOnSubmit(entity);
            base.SubmitChanges();
            return this.Find(entity.PrimaryKey);
        }

        public void Delete(TEntity entity)
        {
            this._db.GetTable<TEntity>().DeleteOnSubmit(entity);
            base.SubmitChanges();
        }

        public IQueryable<TEntity> GetModel()
        {
            this._db.Refresh(System.Data.Linq.RefreshMode.OverwriteCurrentValues, this.DbSet);//解决频繁刷新数据问题
            return this.DbSet;
        }

        public TEntity Find(params object[] keyValues)
        {
            var mapping = _db.Mapping.GetTable(typeof(TEntity));
            var keys = mapping.RowType.IdentityMembers.Select((m, i) => m.Name + " = @" + i).ToArray();
            return this.DbSet.Where(String.Join(" && ", keys), keyValues).FirstOrDefault();
        }

        /// <summary>
        /// 泛型数据表属性
        /// </summary>
        private IQueryable<TEntity> DbSet
        {

            get
            {
                return this._db.GetTable<TEntity>();
            }

        }
        #endregion
    }
}