using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.IO;
using System.Reflection;
using System.Web;
namespace WX.CRM.WebHelper
{
    /// <summary>
    /// 不推荐导出2007，因为只能先导出到服务器然后才能作为下载,而且效率更慢
    /// </summary>
    public class Excel2007Helper
    {
        #region List反射导出Excel
        /// <summary>
        /// List反射导出Excel
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="listModel">实体列表</param>
        /// <param name="sheetName">工作表名称</param>
        /// <param name="sheetSize">一个工作簿的数据量（不能超过65536）</param>
        /// <returns>返回一个流</returns>
        public static void ExportListModelToExcel<T>(List<T> listModel, string sheetName, int sheetSize, string fileName)
        {
            XSSFWorkbook workbook = new XSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            string columnName = string.Empty;
            int x = 0;
            DisplayNameAttribute attribute = null;
            if (sheetSize > 65536)
                sheetSize = 65536;
            int sheetCout = (listModel.Count / sheetSize) + 1;//获取一个工作簿中多少页
            for (int i = 0; i < sheetCout; i++)
            {
                ISheet sheet = workbook.CreateSheet(sheetName + (i + 1));
                IRow headerRow = sheet.CreateRow(0);
                // 设置表头.

                x = 0;
                foreach (PropertyInfo info in typeof(T).GetProperties())
                {
                    attribute = (DisplayNameAttribute)Attribute.GetCustomAttribute(info, typeof(DisplayNameAttribute));
                    headerRow.CreateCell(x).SetCellValue(attribute == null ? info.Name : attribute.DisplayName);//获取类中的DisplayName属性
                    x++;
                }
                // 绑定值
                int rowIndex = 1;
                int mcount = (i + 1) * sheetSize > listModel.Count ? listModel.Count : (i + 1) * sheetSize;
                for (int m = (i * sheetSize); m < mcount; m++)
                {
                    x = 0;
                    IRow dataRow = sheet.CreateRow(rowIndex);
                    foreach (PropertyInfo column in listModel[m].GetType().GetProperties())
                    {
                        dataRow.CreateCell(x).SetCellValue(column.GetValue(listModel[m], null).ToString());
                        x++;
                    }
                    rowIndex++;
                }

            }
            using (var f = File.Create(HttpContext.Current.Server.MapPath(fileName)))//只能先导出excle到服务器在做下载功能
            {
                workbook.Write(f);
            }
        }

        #endregion

        #region List反射导出Excel（根据已经选择的字段）
        /// <summary>
        /// List反射导出Excel（根据以选择的字段）
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="listModel">实体列表</param>
        /// <param name="sheetName">工作表名称</param>
        /// <param name="sheetSize">一个工作簿的数据量（不能超过65536）</param>
        ///  <param name="checkedFilds">已经选择的字段</param>
        /// <returns>返回一个流</returns>
        public static void ExportListModelToExcel<T>(List<T> listModel, string sheetName, int sheetSize, string checkedFilds, string fileName)
        {
            checkedFilds = checkedFilds.ToUpper();
            XSSFWorkbook workbook = new XSSFWorkbook();
            MemoryStream ms = new MemoryStream();
            string columnName = string.Empty;
            int x = 0;
            DisplayNameAttribute attribute = null;
            if (sheetSize > 65536)
                sheetSize = 65536;
            int sheetCout = (listModel.Count / sheetSize) + 1;//获取一个工作簿中多少页
            for (int i = 0; i < sheetCout; i++)
            {
                ISheet sheet = workbook.CreateSheet(sheetName + (i + 1));
                IRow headerRow = sheet.CreateRow(0);
                // 设置表头.

                x = 0;
                foreach (PropertyInfo info in typeof(T).GetProperties())
                {
                    if (checkedFilds.IndexOf("[" + info.Name.ToUpper() + "]") == -1)//如果没有选中该字段跳出这个继续
                        continue;
                    attribute = (DisplayNameAttribute)Attribute.GetCustomAttribute(info, typeof(DisplayNameAttribute));
                    headerRow.CreateCell(x).SetCellValue(attribute == null ? info.Name : attribute.DisplayName);//获取类中的DisplayName属性
                    x++;
                }
                // 绑定值
                int rowIndex = 1;
                int mcount = (i + 1) * sheetSize > listModel.Count ? listModel.Count : (i + 1) * sheetSize;
                for (int m = (i * sheetSize); m < mcount; m++)
                {
                    x = 0;
                    IRow dataRow = sheet.CreateRow(rowIndex);
                    foreach (PropertyInfo column in listModel[m].GetType().GetProperties())
                    {
                        if (checkedFilds.IndexOf("[" + column.Name.ToUpper() + "]") == -1)//如果没有选中该字段跳出这个继续
                            continue;
                        dataRow.CreateCell(x).SetCellValue(column.GetValue(listModel[m], null).ToString());
                        x++;
                    }
                    rowIndex++;
                }

            }
            using (var f = File.Create(HttpContext.Current.Server.MapPath(fileName)))//只能先导出excle到服务器在做下载功能
            {
                workbook.Write(f);
            }
        }

        #endregion
    }
}