分页

  PagePostParam postModel = new PagePostParam() { PageIndex = pagerUser.PageIndex, PageSize = pagerUser.PageSize, OrderBy = "id", OrderType = 0, ht = ht };

public class PagePostParam
    {
       /// <summary>
        /// 当前页码
       /// </summary>
       public int PageIndex { get; set; }
       /// <summary>
       /// 页大小
       /// </summary>
       public int PageSize { get; set; }
       /// <summary>
       /// 排序字段
       /// </summary>
       public string OrderBy { get; set; }
       /// <summary>
       /// 排序类型 0 降序  1 升序
       /// </summary>
       public int OrderType { get; set; }
       /// <summary>
       /// 查询条件
       /// </summary>
       public Hashtable ht { get; set; }
    }

[HttpPost]
        [AuthorizeFilter]
        public HttpResponseMessage getListByParam([FromBody] object value)
        {
            ApiResult<PageResultTable> res = new ApiResult<PageResultTable>();
            try
            {
                JavaScriptSerializer Serializer = new JavaScriptSerializer();
                PagePostParam postModel = Serializer.Deserialize<PagePostParam>(value.ToString());

                Pager page_Model = new Pager();
                page_Model.currentIndex = postModel.PageIndex;
                page_Model.pageSize = postModel.PageSize;
                page_Model.orderBy = postModel.OrderBy;
                page_Model.orderType = postModel.OrderType == 0 ? OrderType.Desc : OrderType.Asc;
                page_Model.tableName = "V_StudentAppointment";
                page_Model.strWhere = "  1=1";
                //hash查询参数
                Hashtable New_ht = new Hashtable();
                if (postModel.ht != null)
                {
                    if (postModel.ht["StuNo"] != null && !string.IsNullOrEmpty(postModel.ht["StuNo"].ToString()))
                    {
                        page_Model.strWhere += " and StuNo like'%'+@StuNo+'%'";
                        New_ht["StuNo"] = postModel.ht["StuNo"];
                    }
                    if (postModel.ht["StuCarType"] != null && !string.IsNullOrEmpty(postModel.ht["StuCarType"].ToString()))
                    {
                        page_Model.strWhere += " and StuCarType =@StuCarType";
                        New_ht["StuCarType"] = postModel.ht["StuCarType"];
                    }
                    if (postModel.ht["CarType"] != null && !string.IsNullOrEmpty(postModel.ht["CarType"].ToString()))
                    {
                        page_Model.strWhere += " and CarType =@CarType";
                        New_ht["CarType"] = postModel.ht["CarType"];
                    }
                    if (postModel.ht["Class"] != null && !string.IsNullOrEmpty(postModel.ht["Class"].ToString()))
                    {
                        page_Model.strWhere += " and StudentClass =@Class";
                        New_ht["Class"] = postModel.ht["Class"];
                    }
                    if (postModel.ht["Coach"] != null && !string.IsNullOrEmpty(postModel.ht["Coach"].ToString()))
                    {
                        page_Model.strWhere += " and (CoachNo like '%'+@Coach+'%' or CoachName like '%'+@Coach+'%')";
                        New_ht["Coach"] = postModel.ht["Coach"];
                    }
                    if (postModel.ht["AppointmentStatus"] != null && !string.IsNullOrEmpty(postModel.ht["AppointmentStatus"].ToString()))
                    {
                        page_Model.strWhere += " and [Status] =@AppointmentStatus";
                        New_ht["AppointmentStatus"] = postModel.ht["AppointmentStatus"];
                    }
                    if (postModel.ht["TimeQuantum"] != null && !string.IsNullOrEmpty(postModel.ht["TimeQuantum"].ToString()))
                    {
                        page_Model.strWhere += " and CaseNo in (select CaseNo from StudentAppointmentTime where AppointmentTime =@TimeQuantum)";
                        New_ht["TimeQuantum"] = postModel.ht["TimeQuantum"];
                    }
                    if (postModel.ht["RegSite"] != null && !string.IsNullOrEmpty(postModel.ht["RegSite"].ToString()))
                    {
                        page_Model.strWhere += " and RegSiteId =@RegSite";
                        New_ht["RegSite"] = postModel.ht["RegSite"];
                    }
                    if (postModel.ht["TrainingGround"] != null && !string.IsNullOrEmpty(postModel.ht["TrainingGround"].ToString()))
                    {
                        page_Model.strWhere += " and EduSiteNo =@TrainingGround";
                        New_ht["TrainingGround"] = postModel.ht["TrainingGround"];
                    }
                    if (postModel.ht["StartDate"] != null && postModel.ht["EndDate"] != null)
                    {
                        page_Model.strWhere += " and CaseNo in (select CaseNo from StudentAppointmentTime where AppointmentDate between @StartDate and  @EndDate)";
                        New_ht["StartDate"] = postModel.ht["StartDate"];
                        New_ht["EndDate"] = postModel.ht["EndDate"];
                    }
                    if (postModel.ht["Schoolid"] != null && !string.IsNullOrEmpty(postModel.ht["Schoolid"].ToString()))
                    {
                        page_Model.strWhere += " and SchoolId=@Schoolid";
                        New_ht["Schoolid"] = postModel.ht["Schoolid"];
                    }
                }
                page_Model.HtParam = New_ht;

                if (page_Model != null)
                {
                    B_Page.GetModel(page_Model);

                    res.ResultFlag = 1;
                    res.ResultMsg = "操作成功";
                    res.ResultObj = new PageResultTable() { RowsCout = page_Model.recordCount, dt = page_Model.dataSource };
                }
                else
                {
                    res.ResultFlag = 0;
                    res.ResultMsg = "参数错误";
                    res.ResultObj = null;
                }
            }
            catch (Exception ex)
            {
                res.ResultFlag = 0;
                res.ResultMsg = ex.Message;
                res.ResultObj = null;
                //写错误日志
                WebLogTool.WriteLog(ex, "StudentAppointment-getListByParam");
            }
            return HttpHelper.ResponseMessagetoJson(res);
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using Wisdom.DAL.Framework.Data;
using System.Collections;
using System.Runtime.InteropServices;
using Wisdom.JPClient.Common.Utils;

namespace Wisdom.JPClient.Bll.Utils
{
    public static class B_Page
    {
        private static D_Page dal = new D_Page();


        /// <summary>
        /// 获取分页实体
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public static Pager GetModel(Pager model)
        {
            if (!string.IsNullOrEmpty(model.tableName))
            {
                if (!string.IsNullOrEmpty(model.tableName))
                {
                    model.recordCount = dal.Count(model);
                    DataSet ds = dal.GetList(model);
                    model.dataSource = ds.Tables[0];
                    if (model.recordCount > 0 && model.dataSource.Rows.Count == 0 && model.pageSize != 0)
                    {
                        model.currentIndex = model.recordCount / model.pageSize;
                        if (model.recordCount % model.pageSize != 0)
                        {
                            model.currentIndex += 1;
                        }
                        ds = dal.GetList(model);
                        model.dataSource = ds.Tables[0];
                    }
                }
            }
            return model;
        }

        /// <summary>
        /// 总记录数
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public static int GetCount(Pager model)
        {
            return dal.Count(model);
        }


        /// <summary>
        /// 查询所有数据列表
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public static Pager GetAllList(Pager model)
        {
            if (!string.IsNullOrEmpty(model.tableName))
            {
                DataSet ds = dal.GetAllList(model);
                model.dataSource = ds.Tables[0];
                model.recordCount = model.dataSource.Rows.Count;
            }
            return model;
        }


    }
    /// <summary>
    /// 分页查询数据访问层
    /// </summary>
    public class D_Page
    {
        /// <summary>
        /// 分页查询
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public DataSet GetList(Pager model)
        {
            BaseDal dal = new BaseDal();
            StringBuilder strSql = new StringBuilder();
            strSql.Append("SELECT  ");
            strSql.Append(model.Fileds);
            strSql.Append(" FROM ( ");
            strSql.Append(" SELECT ROW_NUMBER() OVER (");
            if (!string.IsNullOrEmpty(model.orderBy))
            {
                strSql.Append("order by T.");
                strSql.Append(Utils2.ValidChar(model.orderBy));
                if (model.orderType == OrderType.Asc)
                {
                    strSql.Append(" asc ");
                }
                else
                {
                    strSql.Append(" desc ");
                }
            }
            else
            {
                strSql.Append(" order by T.id desc");
            }
            strSql.Append(") AS Row, T.*  from ");
            strSql.Append(model.tableName);
            strSql.Append(" T with(nolock) ");
            if (!string.IsNullOrEmpty(model.strWhere))
            {
                strSql.Append(" WHERE " + model.strWhere);
            }
            strSql.Append(" ) TT");
            strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", (model.currentIndex - 1) * model.pageSize + 1, model.currentIndex * model.pageSize);

            DataSet ds = null;
            ds = dal.GetDataSetBySql(strSql.ToString(), model.HtParam);
            return ds;
        }

        /// <summary>
        /// 分页统计
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public int Count(Pager model)
        {
            BaseDal dal = new BaseDal();
            StringBuilder strSql = new StringBuilder();
            strSql.Append("SELECT count(*) FROM  ");
            strSql.Append(model.tableName);
            strSql.Append(" as T");
            strSql.Append(" with(nolock) ");
            if (!string.IsNullOrEmpty(model.strWhere))
            {
                strSql.Append(" where ");
                strSql.Append(model.strWhere);
            }
            DataSet ds = null;

            ds = dal.GetDataSetBySql(strSql.ToString(), model.HtParam);

            int count = int.Parse(ds.Tables[0].Rows[0][0].ToString(), System.Globalization.CultureInfo.InvariantCulture);
            return count;
        }


        /// <summary>
        /// 查询所有数据
        /// </summary>
        /// <param name="model"></param>
        /// <returns></returns>
        public DataSet GetAllList(Pager model)
        {
            BaseDal dal = new BaseDal();
            StringBuilder strSql = new StringBuilder();
            strSql.Append("SELECT  ");
            strSql.Append(model.Fileds);
            strSql.Append(" FROM ( ");
            strSql.Append(" SELECT ROW_NUMBER() OVER (");
            if (!string.IsNullOrEmpty(model.orderBy))
            {
                strSql.Append("order by T.");
                strSql.Append(Utils2.ValidChar(model.orderBy));
                if (model.orderType == OrderType.Asc)
                {
                    strSql.Append(" asc ");
                }
                else
                {
                    strSql.Append(" desc ");
                }
            }
            else
            {
                strSql.Append(" order by T.id desc");
            }
            strSql.Append(") AS Row, T.*  from ");
            strSql.Append(model.tableName);
            strSql.Append(" T with(nolock) ");
            if (!string.IsNullOrEmpty(model.strWhere))
            {
                strSql.Append(" WHERE " + model.strWhere);
            }
            strSql.Append(" ) TT");
            //strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", (model.currentIndex - 1) * model.pageSize + 1, model.currentIndex * model.pageSize);

            DataSet ds = null;
            ds = dal.GetDataSetBySql(strSql.ToString(), model.HtParam);
            return ds;
        }


    }
   
    public class Pager
    {
        private string _tableName;
        private int _currentIndex = 1;
        private int _pageSize = 15;
        private int _pageCount;
        private string _strWhere;
        private string _orderBy;
        private OrderType _orderType;
        private int _recordCount = 0;
        private DataTable _dataSource = null;
        private string _fileds = "*";
        private Hashtable _htParam = new Hashtable();



        /// <summary>
        /// 参数 hashtable
        /// </summary>
        public Hashtable HtParam
        {
            get { return _htParam; }
            set { _htParam = value; }
        }

        /// <summary>
        /// 表名
        /// </summary>
        public string tableName
        {
            get { return _tableName; }
            set { _tableName = value; }
        }

        /// <summary>
        /// 当前页
        /// </summary>
        public int currentIndex
        {
            get { return _currentIndex; }
            set { _currentIndex = value; }
        }

        /// <summary>
        /// 页大小
        /// </summary>
        public int pageSize
        {
            get { return _pageSize; }
            set { _pageSize = value; }
        }

        /// <summary>
        /// 总页数
        /// </summary>
        public int pageCount
        {
            get { return _pageCount; }
        }

        /// <summary>
        /// 查询条件
        /// </summary>
        public string strWhere
        {
            get { return _strWhere; }
            set { _strWhere = value; }
        }

        /// <summary>
        /// 排序字段
        /// </summary>
        public string orderBy
        {
            get { return _orderBy; }
            set { _orderBy = value; }
        }

        /// <summary>
        /// 排序类型
        /// </summary>
        public OrderType orderType
        {
            get { return _orderType; }
            set { _orderType = value; }
        }

        /// <summary>
        /// 总行数
        /// </summary>
        public int recordCount
        {
            get { return _recordCount; }
            set
            {
                _recordCount = value;
                if (_recordCount == 0)
                {
                    _pageCount = 1;
                }
                else
                {
                    if (_pageSize <= 0)
                    {
                        _pageSize = 15;//分母不能为0
                    }
                    _pageCount = _recordCount / _pageSize;
                    if (_recordCount % _pageSize != 0)
                    {
                        _pageCount++;
                    }
                }
            }
        }

        /// <summary>
        /// 数据源
        /// </summary>
        public DataTable dataSource
        {
            get { return _dataSource; }
            set { _dataSource = value; }
        }

        /// <summary>
        /// 查询字段  默认为所有字段
        /// </summary>
        public string Fileds
        {
            get { return _fileds; }
            set { _fileds = value; }
        }
    }

    public class Pager1
    {
        private string _tableName;
        private int _currentIndex = 1;
        private int _pageSize = 15;
        private int _pageCount;
        private string _strWhere;
        private string _orderBy;
        private OrderType _orderType;
        private int _recordCount = 0;
        private DataTable _dataSource = null;
        private string _fileds = "*";


        /// <summary>
        /// 表名
        /// </summary>
        public string tableName
        {
            get { return _tableName; }
            set { _tableName = value; }
        }

        /// <summary>
        /// 当前页
        /// </summary>
        public int currentIndex
        {
            get { return _currentIndex; }
            set { _currentIndex = value; }
        }

        /// <summary>
        /// 页大小
        /// </summary>
        public int pageSize
        {
            get { return _pageSize; }
            set { _pageSize = value; }
        }

        /// <summary>
        /// 总页数
        /// </summary>
        public int pageCount
        {
            get { return _pageCount; }
        }

        /// <summary>
        /// 查询条件
        /// </summary>
        public string strWhere
        {
            get { return _strWhere; }
            set { _strWhere = value; }
        }

        /// <summary>
        /// 排序字段
        /// </summary>
        public string orderBy
        {
            get { return _orderBy; }
            set { _orderBy = value; }
        }

        /// <summary>
        /// 排序类型
        /// </summary>
        public OrderType orderType
        {
            get { return _orderType; }
            set { _orderType = value; }
        }

        /// <summary>
        /// 总行数
        /// </summary>
        public int recordCount
        {
            get { return _recordCount; }
            set
            {
                _recordCount = value;
                if (_recordCount == 0)
                {
                    _pageCount = 1;
                }
                else
                {
                    _pageCount = _recordCount / _pageSize;
                    if (_recordCount % _pageSize != 0)
                    {
                        _pageCount++;
                    }
                }
            }
        }

        /// <summary>
        /// 数据源
        /// </summary>
        public DataTable dataSource
        {
            get { return _dataSource; }
            set { _dataSource = value; }
        }

        /// <summary>
        /// 查询字段  默认为所有字段
        /// </summary>
        public string Fileds
        {
            get { return _fileds; }
            set { _fileds = value; }
        }
    }

    /// <summary>
    /// 排序类型
    /// </summary>
    public enum OrderType
    {
        /// <summary>
        /// 升序
        /// </summary>
        Asc,
        /// <summary>
        /// 降序
        /// </summary>
        Desc
    }
}