SODHelper/OrderBy.cs

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using System;
using System.Collections.Generic;
using System.Text;
using PWMIS.DataMap.Entity;
using PWMIS.Common;

namespace SODHelper
{
    public class OrderByExpression<T> where T : EntityBase, new() 
    {
        private IList<string> orderbyList = new List<string>();

        /// <summary>
        /// 升序排列字段
        /// </summary>
        /// <param name="fieldNames">排序字段名</param>
        /// <returns></returns>
        public OrderByExpression<T> Asc(params string[] fieldNames)
        {
            T t = new T();
            foreach (var fieldName in fieldNames)
            {
                orderbyList.Add(string.Format("{0} asc", fieldName));
            }
            return this;
        }

        /// <summary>
        /// 降序排列字段
        /// </summary>
        /// <param name="fieldNames">排序字段名</param>
        /// <returns></returns>
        public OrderByExpression<T> Desc(params string[] fieldNames)
        {
            T t = new T();

            foreach (var fieldName in fieldNames)
            {
                orderbyList.Add(string.Format("{0} desc", fieldName));
            }
            return this;
        }

        /// <summary>
        /// 获得排序元素集
        /// </summary>
        /// <returns></returns>
        public IList<string> GetOrderByParameter() 
        {
            return orderbyList;
        }
    }

}