c# npol读取excel

npol读取excel

添加引用
找到项目的Nuget包 添加npol的引用（开始以为npol的dll必须要从别的地方单独下载才可以，后来直接从vs里面的Nuget包引用也是可以的） 

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下面是读取excel方法：


            /// 

            /// 读取excel
            /// 
            /// 文件绝对路径
            /// 工作表名称
            /// 是否创建excel中的第一行
            /// 
            public static DataTable ReadExcel(string filePath, string sheetName, bool isFirstColumnName = true)
            {
                if (!File.Exists(filePath))
                    return null;
                DataTable data = new DataTable();
                try
                {
                    using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read))
                    {
                        IWorkbook workbook = null;  //新建IWorkbook对象
                        if (filePath.IndexOf(".xlsx") > 0)  
                        {
                            workbook = new XSSFWorkbook(fileStream);
                        }
                        else if (filePath.IndexOf(".xls") > 0) 
                        {
                            workbook = new HSSFWorkbook(fileStream);
                        }
                        else return null;
                        ISheet sheet = workbook.GetSheet(sheetName);  //获取工作表  
                        if (sheet.LastRowNum <= 0) return null;
                        IRow firstRowClounms = sheet.GetRow(0);
                        int startRow = 0;
                        if (isFirstColumnName)//是否构建excel的第一行 
                        {
                            startRow = 1;
                            for (int i = firstRowClounms.FirstCellNum; i < firstRowClounms.LastCellNum; ++i)
                            {
                                DataColumn column = new DataColumn(firstRowClounms.GetCell(i).StringCellValue);
                                data.Columns.Add(column);
                            }
                        }
                        else
                        {
                            for (int i = firstRowClounms.FirstCellNum; i < firstRowClounms.LastCellNum; ++i)
                            {
                                var column = new DataColumn("column" + (i + 1));
                                data.Columns.Add(column);
                            }
                        }
                        for (int i = startRow; i <= sheet.LastRowNum; i++)
                        {
                            IRow row = sheet.GetRow(i);  //row读入第i行数据  
                            if (row == null) continue;
    
                            DataRow dr = data.NewRow();
                            for (int j = 0; j < row.LastCellNum; j++)  //获取工作表每一列  
                            {
                                if (!string.IsNullOrEmpty(row.GetCell(j).ToString()))
                                    dr[j] = GetConvertValueType(row.GetCell(j));
                            }
                            data.Rows.Add(dr);
                        }
                    }
                    return data;
                }
                catch (Exception ex)
                {
                    throw ex;
                    return null;
                }
            }

        private static object GetConvertValueType(ICell cell)
        {
            if (cell == null)
                return null;
            switch (cell.CellType)
            {
                case CellType.Blank:
                    return null;
                case CellType.Boolean:   
                    return cell.BooleanCellValue;
                case CellType.Numeric: 
                    short format = cell.CellStyle.DataFormat;
                    if (format != 0) { return Convert.ToDateTime(cell.DateCellValue).ToString("yyyy-MM-dd HH:mm:ss"); } else { return cell.NumericCellValue; }
                case CellType.String:
                    return cell.StringCellValue;
                case CellType.Error: 
                    return cell.ErrorCellValue;
                case CellType.Formula:
                default:
                    return "=" + cell.CellFormula;
            }
        }

读取后的结果