C#基础知识 NPOI动态库 将Excle数据导入DataTable中

此文为了实现将Excel数据导入DataTable中展示，不过有一些弊端，暂时不支持复杂格式的Excel导入。 这是个完整的类，添加相应的.dll可直接使用。

/***********************
Author: Tst
优快云 bolg: Ricardo.M.Tan
***********************/
using System;
using System.Data;
using System.IO;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.HSSF.UserModel;

namespace Chn.gzGISer.NPOIHelper
{
    /// <summary>
    /// 将Excel数据加载到DataTable中
    /// </summary>
    public class NPOILoadToDataTable
    {
        private static IWorkbook workBook = null;
        private static FileStream fs = null;

        /// <summary>
        /// 将excel中的数据导入到DataTable中
        /// </summary>
        /// <param name="fileName">excel工作薄文件路径</param>
        /// <param name="sheetName">excel工作薄sheet的名称</param>
        /// <param name="isFirstRowColumn">是否将第一行是设为DataTable的列名</param>
        /// <returns>返回的DataTable</returns>
        public static DataTable ExcelToDataTable(string fileName, string sheetName, bool isFirstRowColumn)
        {
            ISheet sheet = null;
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                fs = new FileStream(fileName, FileMode.Open, FileAccess.Read);
                if (fileName.IndexOf(".xlsx") > 0)
                {
                    workBook = new XSSFWorkbook(fs);
                }
                else if (fileName.IndexOf(".xls") > 0)
                {
                    workBook = new HSSFWorkbook(fs);
                }
                if (sheetName != null)
                {
                    sheet = workBook.GetSheet(sheetName);
                    if (sheet == null)
                    {
                        sheet = workBook.GetSheetAt(0);
                    }
                }
                else
                {
                    sheet = workBook.GetSheetAt(0);
                }
                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    int cellCount = firstRow.LastCellNum;
                    if (isFirstRowColumn)
                    {
                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                        {
                            ICell cell = firstRow.GetCell(i);
                            if (cell != null)
                            {
                                string cellValue = cell.StringCellValue;
                                if (cellValue != null)
                                {
                                    DataColumn column = new DataColumn(cellValue);
                                    data.Columns.Add(column);
                                }
                            }
                        }
                        startRow = sheet.FirstRowNum;
                    }
                    else
                    {
                        startRow = sheet.FirstRowNum + 1;
                    }

                    int rowCount = sheet.LastRowNum;
                    for (int i = startRow; i <= rowCount; ++i)
                    {
                        IRow row = sheet.GetRow(i);
                        if (row == null)
                        {
                            continue;
                        }
                        DataRow dataRow = data.NewRow();
                        for (int j = row.FirstCellNum; j < cellCount; ++j)
                        {
                            if (row.GetCell(j) != null)
                            {
                                dataRow[j] = row.GetCell(j).ToString();
                            }
                        }
                        data.Rows.Add(dataRow);
                    }
                }
            }
            catch (Exception)
            {
                throw;
            }
            finally
            {
                fs.Dispose();
            }
            return data;
        }
    }
}