BPA.SAAS.Manage/BPA.SAAS.Manage.Comm/Util/ReadExcel.cs

using Microsoft.VisualBasic;
using Npoi.Mapper;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace BPA.SAAS.Manage.Comm.Util
{
    public class ReadExcel<T> where T : class, new()
    {
        /// <summary>
        /// 导入xlsx
        /// </summary>
        /// <param name="stream"></param>
        /// <returns></returns>
        public List<T> RedXml(Stream stream)
        {
            DataTable dtTable = new DataTable();
            List<string> rowList = new List<string>();
            ISheet sheet;
            stream.Position = 0;
            XSSFWorkbook xssWorkbook = new XSSFWorkbook(stream);
            sheet = xssWorkbook.GetSheetAt(0);
            IRow headerRow = sheet.GetRow(0);
            int cellCount = headerRow.LastCellNum;
            for (int j = 0; j < cellCount; j++)
            {
                ICell cell = headerRow.GetCell(j);
                if (cell == null || string.IsNullOrWhiteSpace(cell.ToString())) continue;
                {
                    dtTable.Columns.Add(cell.ToString());
                }
            }
            for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
            {
                IRow row = sheet.GetRow(i);
                if (row == null) continue;
                if (row.Cells.All(d => d.CellType == CellType.Blank)) continue;
                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    if (row.GetCell(j) != null)
                    {
                        if (!string.IsNullOrEmpty(row.GetCell(j).ToString()) && !string.IsNullOrWhiteSpace(row.GetCell(j).ToString()))
                        {
                            rowList.Add(row.GetCell(j).ToString());
                        }
                    }
                }
                if (rowList.Count > 0)
                    dtTable.Rows.Add(rowList.ToArray());
                rowList.Clear();
            }
            var data = DataTableUitity.DatatTableToList<T>(dtTable);
            return data;
        }
        /// <summary>
        /// Excel转为List
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="fileStream"></param>
        /// <param name="sheetname"></param>
        /// <returns></returns>
        public List<T> ExcelToList(Stream fileStream, Mapper mapper, string sheetname = "")
        {
            List<T> ModelList = new List<T>();
            // var mapper = new Mapper(fileStream);
            List<RowInfo<T>> DataList = new List<RowInfo<T>>();
            if (!string.IsNullOrEmpty(sheetname))
            {
                DataList = mapper.Take<T>(sheetname).ToList();
            }
            else
            {
                DataList = mapper.Take<T>().ToList();
            }
            if (DataList != null && DataList.Count > 0)
            {
                foreach (var item in DataList)
                {
                    ModelList.Add(item.Value);
                }
            }

            return ModelList;
        }
        /// <summary>
        /// List转Excel
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="list">数据</param>
        /// <param name="sheetName">表名</param>
        /// <param name="overwrite">true,覆盖单元格，false追加内容(list和创建的excel或excel模板)</param>
        /// <param name="xlsx">true-xlsx，false-xls</param>
        /// <returns>返回文件</returns>
        public MemoryStream ListToExcel(List<T> list, string sheetName = "sheet1", bool overwrite = true, bool xlsx = true)
        {
            var mapper = new Mapper();
            MemoryStream ms = new MemoryStream();
            mapper.Save<T>(ms, list, sheetName, overwrite, xlsx);
            return ms;
        }
    }
}