API后台控制器示例（分页 添加）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using Model;
using DAL;

namespace .Shopping.Controllers
{
    public class ShoppingController : ApiController
    {
        ShoppingDAL dal = new ShoppingDAL();
        /// <summary>
        /// 分页查询优惠券领取的方法
        /// </summary>
        /// <param name="pageSize">每页记录数</param>
        /// <param name="currentPage">当前第几页</param>
        /// <param name="yhfs">优惠方式</param>
        /// <param name="hxzt">核销状态</param>
        /// <param name="mc">优惠券名称</param>
        /// <returns></returns>
        public pageModel Get(int pageSize = 3, int currentPage = 1, string yhfs = "", string hxzt = "", string mc = "")
        {
            //修正传入的页数<1的情况
            if(currentPage < 1)
            {
                currentPage = 1;
            }
            //查询出所有列表
            var list = dal.Show();

            if (!string.IsNullOrEmpty(yhfs)) //如果传入的优惠方式不为空，则将列表中对优惠方式进行过滤
            {
                list = list.Where(s => s.yhfs == yhfs).ToList();
            }
            if (!string.IsNullOrEmpty(hxzt)) //过滤核销状态
            {
                list = list.Where(s => s.hxzt == hxzt).ToList();
            }
            if (!string.IsNullOrEmpty(mc)) //过滤优惠券名称（模糊查询）
            {
                list = list.Where(s => s.mc.Contains(mc)).ToList();
            }
            var count = list.Count(); //查询出总记录数
            //查询出总页数
            int page;
            if(count % pageSize == 0)
            {
                page = count / pageSize;
            }
            else
            {
                page = count / pageSize + 1;
            }
            //纠正当前页 > 总页数的情况
            if(currentPage > page)
            {
                currentPage = page;
            }
            //使用linq分页查询列表
            list = list.Skip((currentPage - 1) * pageSize).Take(pageSize).ToList();

            var m = new pageModel();
            m.list = list; //列表就是分页查询出的列表
            m.totalCount = count;
            m.totalPage = page;
            m.currentPage = currentPage;
            return m;
        }

        // POST: api/Shopping
        /// <summary>
        /// 添加优惠券的控制器
        /// </summary>
        /// <param name="m"></param>
        /// <returns></returns>
        public int Post([FromBody]yhqModel m)
        {
            //如果使用时间限制选择第一个选项
            if(m.sysjCheck == 1)
            {
                m.ksrq = DateTime.Now;
                m.jsrq = DateTime.Now.AddDays(m.sysjAdd);
            }

            return dal.Add(m);
        }

    }
}