这次来看看将excel中的内容用npoi导入到一个datatable中的方法

代码如下：

using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Collections;
using System.Data;
using System.IO;
using System.Security.Cryptography;
using System.Text;

public class Office_NPOI
{
    #region 设置单元格样式 示例
    //IWorkbook wk = myexcel.workbook(filename);

    //ICellStyle style = wk.CreateCellStyle();//创建样式
    //style.VerticalAlignment = VerticalAlignment.Justify;//垂直居中 方法1 
    //    style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CenterSelection;//设置居中 方法2
    //    //style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//设置居中 方法3 

    //    ISheet sheet = myexcel.sheet(wk, 0);
    //IRow row = myexcel.row(sheet, 2);
    //ICell cell = myexcel.cell(row, 2);
    //cell.CellStyle = style;
    //myexcel.save(filename, wk);
    #endregion

    public class EXCEL
    {
        /// <summary>
        /// 将Excel中的数据导入DataTable中，空行会自动去掉
        /// <para>--------------说明------------------</para>
        /// <para>DataTable dt = NPOI_Excel2DT_ByFileName("D:\\1.xlsx", "PP", true);</para>
        /// <para>------------------------------------</para>
        /// </summary>
        /// <param name="_ExcelFileName">Excel文件路径</param>
        /// <param name="_sheetinfo">Sheet信息,可以是索引或者列名,找不到时得到第一个sheet</param>
        /// <param name="_FirstRowisColumnName">Excel的第一行数据是不是列名</param>
        /// <returns></returns>
        public DataTable NPOI_Excel2DT_ByFileName(string _ExcelFileName, object _sheetinfo, bool _FirstRowisColumnName)
        {
            IWorkbook workbook = null;
            ISheet sheet = null;
            DataTable data = new DataTable();
            int startRow = 0;
            try
            {
                workbook = NOPI_workbook(_ExcelFileName);
                sheet = NPOI_sheet(workbook, _sheetinfo);

                if (sheet != null)
                {
                    IRow firstRow = sheet.GetRow(0);
                    int cellbeginnum = firstRow.FirstCellNum;
                    int cellCount = firstRow.LastCellNum; //一行最后一个cell的编号 即总的列数

                    if (_FirstRowisColumnName)
                    {
                        for (int i = cellbeginnum; 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 + 1;
                    }
                    else
                    {
                        DataColumn column = new DataColumn();
                        data.Columns.Add(column);
                        startRow = sheet.FirstRowNum;
                    }

                    //最后一列的标号
                    int dtcolumncount = data.Columns.Count;
                    int rowCount = sheet.LastRowNum;
                    for (int i = startRow; i <= rowCount; ++i)
                    {
                        IRow row = sheet.GetRow(i);
                        if (row == null) continue; //没有数据的行默认是null　　　　　　　

                        ArrayList al = new ArrayList();
                        for (int j = cellbeginnum; j < cellCount; ++j)
                        {
                            if (row.GetCell(j) != null) //同理，没有数据的单元格都默认是null
                                al.Add(row.GetCell(j).ToString());
                            else
                                al.Add(null);
                        }

                        DataRow dataRow = data.NewRow();
                        for (int j = 0; j < dtcolumncount; j++)
                        {
                            dataRow[j] = al[j];
                        }
                        data.Rows.Add(dataRow);
                    }
                }

                return data;
            }
            catch (Exception ex)
            {
                //处理民间常
                return null;
            }
        }

        public IWorkbook NOPI_workbook(string _filename)
        {
            IWorkbook wk = null;
            using (var file = File.Open(_filename, FileMode.OpenOrCreate, FileAccess.Read))
            {
                wk = new XSSFWorkbook(file);
                file.Close();
            }
            return wk;
        }
        public ISheet NPOI_sheet(IWorkbook wk, object _sheetinfo)
        {
            ISheet sheet = null;
            if (_sheetinfo is int)
            {
                sheet = wk.GetSheetAt((int)_sheetinfo);
            }
            else
            {
                sheet = wk.GetSheet((string)_sheetinfo);
            }

            if (sheet == null)
            {
                sheet = wk.GetSheetAt(0);
            }
            return sheet;
        }
    }
}

参数说明

DataTable dt = NPOI_Excel2DT_ByFileName("D:\\1.xlsx", "PP", true);

1、Excel文件路径

2、哪个sheet,可以是sheet名称，也可以是索引，如果找不到该名称或者索引的sheet，默认导入第一个sheet中的内容

3、excel文件的目标sheet的第一行是不是标题行

Tags：npoi

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