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C#中怎么使用Npoi导出Excel合并行列

发布时间:2022-02-22 18:36:07 来源:亿速云 阅读:544 作者:iii 栏目:开发技术

这篇文章主要讲解了“C#中怎么使用Npoi导出Excel合并行列”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“C#中怎么使用Npoi导出Excel合并行列”吧!

现在用Npoi导出Excel,导出表格是合并行列,如图:

C#中怎么使用Npoi导出Excel合并行列

导出的要求:合计列要进行合并,序号一致的要合并。最后一行要合并列。
因为相同序号数量不是固定的,要动态算合并的行数。

合并行列接口:XXX.AddMergedRegion(new CellRangeAddress(开始行, 最后一行, 开始列, 最后一列));

隐藏指定:sheet.SetColumnHidden(cellIndex, true);

引用组件:

NPOI.dll;
NPOI.OOXML.dll;
NPOI.OpenXml4Net.dll;
NPOI.OpenXmlFormats.dll;
ICSharpCode.SharpZipLib.dll;

代码如下:

/// <summary>
/// 
/// </summary>
/// <param name="dtSource">数据源</param>
/// <param name="strFileName">保存路径</param>
/// <param name="dvXH">序号</param>
public void Export(DataTable dtSource,string strFileName,DataView dvXH=null)
        {
            //创建工作簿 office2007以上
            XSSFWorkbook workbook = new XSSFWorkbook();
            //为工作簿创建工作表并命名
            ISheet sheet = workbook.CreateSheet("商品表");

            ICellStyle dateStyle = workbook.CreateCellStyle();

            IDataFormat format = workbook.CreateDataFormat();
            dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");

            #region 表头及样式
            int cellIndex = 0;
            IRow headerRow = sheet.CreateRow(0);
            for (int i = 0; i < dtSource.Columns.Count; i++)
            {
                #region MyRegion
                string ColumnsName = dtSource.Columns[i].ToString();
                if (dtSource.Columns[i].ColumnName.EndsWith("XH"))
                {
                    ColumnsName = "序号";
                    sheet.SetColumnWidth(cellIndex, 3000);
                   //sheet.SetColumnHidden(cellIndex, true);隐藏指定列
                }
                else if (dtSource.Columns[i].ColumnName.EndsWith("GoogName"))
                {
                    ColumnsName = "商品名称";
                    sheet.SetColumnWidth(cellIndex,10000);//设置列宽
                }
                else if (dtSource.Columns[i].ColumnName.EndsWith("Num"))
                {
                    ColumnsName = "数量";
                    sheet.SetColumnWidth(cellIndex, 5000);
                }

                else if (dtSource.Columns[i].ColumnName.EndsWith("Summation"))
                {
                    ColumnsName = "合计(元)";
                    sheet.SetColumnWidth(cellIndex, 5000);
                }
                #endregion

                //设置行高
                headerRow.HeightInPoints = 35; 
                headerRow.CreateCell(cellIndex).SetCellValue(ColumnsName);

                ICellStyle headStyle = workbook.CreateCellStyle();
                headStyle.WrapText = true;
                IFont font = workbook.CreateFont();
                //字体大小
                font.FontHeightInPoints = 12;
                font.Boldweight = 360;
                headStyle.SetFont(font);
                headerRow.GetCell(cellIndex).CellStyle = headStyle;
                cellIndex++;
            }
            #endregion

            int rowIndex = 1;//行数一定要从1行开始
            int count = 1;
            int startRow = 1;
            DataView dvSource = dtSource.DefaultView;
            if (dvXH!=null)
            {
                foreach (DataRowView drv in dvXH)
                {//1-10.11-12,13-14,15-16
                    int rowcout = 0;
                    dvSource.RowFilter = "XH='" + drv["XH"] + "'";
                    foreach (DataRowView row in dvSource)
                    {
                        #region 填充内容
                        IRow dataRow = sheet.CreateRow(rowIndex);

                        //序号
                        ICell newCel0 = dataRow.CreateCell(0);
                        ICellStyle style0 = workbook.CreateCellStyle();
                        style0.DataFormat = format.GetFormat("text");
                        newCel0.SetCellValue(row["XH"].ToString());

                        //标的名称
                        ICell newCel2 = dataRow.CreateCell(1);
                        ICellStyle style2 = workbook.CreateCellStyle();
                        style2.DataFormat = format.GetFormat("text");
                        newCel2.SetCellValue(row["GoogName"].ToString());

                        //标的数量
                        ICell newCel4 = dataRow.CreateCell(2);
                        ICellStyle style4 = workbook.CreateCellStyle();
                        style4.DataFormat = format.GetFormat("text");
                        newCel4.SetCellValue(row["Num"].ToString());

                        //合计(元)
                        ICell newCel8 = dataRow.CreateCell(3);
                        ICellStyle style8 = workbook.CreateCellStyle();
                        style8.DataFormat = format.GetFormat("text");
                        newCel8.SetCellValue(row["Summation"].ToString());
                        #endregion

                        rowIndex++;
                        rowcout++;
                    }

                    if (count == 1)
                    {
                        //合并行数
                        sheet.AddMergedRegion(new CellRangeAddress(startRow, rowcout, 3, 3));
                        startRow = startRow + rowcout;
                    }
                    else
                    {
                        sheet.AddMergedRegion(new CellRangeAddress(startRow, startRow + rowcout - 1, 3, 3));
                        startRow = startRow + rowcout;
                    }
                    count++;
                }
            }
            else
            {
                #region MyRegion
                foreach (DataRowView row in dvSource)
                {
                    #region 填充内容
                    IRow dataRow = sheet.CreateRow(rowIndex);

                    //序号
                    ICell newCel0 = dataRow.CreateCell(0);
                    ICellStyle style0 = workbook.CreateCellStyle();
                    style0.DataFormat = format.GetFormat("text");
                    newCel0.SetCellValue(row["XH"].ToString());
              
                    //商品名称
                    ICell newCel1 = dataRow.CreateCell(1);
                    ICellStyle style1 = workbook.CreateCellStyle();
                    style1.DataFormat = format.GetFormat("text");
                    newCel1.SetCellValue(row["GoogName"].ToString());

                    //数量
                    ICell newCel2 = dataRow.CreateCell(2);
                    ICellStyle style2 = workbook.CreateCellStyle();
                    style2.DataFormat = format.GetFormat("text");
                    newCel2.SetCellValue(row["Num"].ToString());
                   
                    //合计(元)
                    ICell newCel3 = dataRow.CreateCell(3);
                    ICellStyle style3 = workbook.CreateCellStyle();
                    style3.DataFormat = format.GetFormat("text");
                    newCel3.SetCellValue(row["Summation"].ToString());
                    #endregion
                    rowIndex++;
                }
                #endregion
            }
            #region 拼接最后一行
            IFont fontLast = workbook.CreateFont();
            fontLast.FontHeightInPoints = 30;
            fontLast.Boldweight = 480;
            IRow dataRowLast = sheet.CreateRow(rowIndex);
            dataRowLast.HeightInPoints = 40;
            ICell newCelLast = dataRowLast.CreateCell(0);
            ICellStyle styleLast = workbook.CreateCellStyle();
            styleLast.DataFormat = format.GetFormat("text");
            styleLast.SetFont(fontLast);
            newCelLast.SetCellValue("制作人:张三");
            sheet.AddMergedRegion(new CellRangeAddress(rowIndex, rowIndex, 0, 3));
            #endregion

            MemoryStream stream = new MemoryStream();
            workbook.Write(stream);
            var buf = stream.ToArray();
            using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
            {
                fs.Write(buf, 0, buf.Length);
                fs.Flush();
            }
}

实际运用中,涉及到数据,方法中有很多校验等操作,方法直观可读性不是太好,下面附上简单导出的方法:

实际上导出Excel,总结有几点:

1、引用相关组件
2、创建一个工作簿,创建工作表并命名;
3、设置表头及样式;
4、填充数据;
5、保存数据到指定位置;

/// <summary>
/// 简单导出数据
/// </summary>
/// <param name="dtSource">数据源</param>
/// <param name="strFileName">保存路径</param>
/// <param name="dvXH">序号</param>
        public void Export1(DataTable dtSource, string strFileName)
        {
            //创建工作簿
            XSSFWorkbook workbook = new XSSFWorkbook();
            //为工作簿创建工作表并命名
            ISheet sheet = workbook.CreateSheet("商品表");
            IDataFormat format = workbook.CreateDataFormat();

            #region 表头及样式
            int cellIndex = 0;
            IRow headerRow = sheet.CreateRow(0);
            for (int i = 0; i < dtSource.Columns.Count; i++)
            {
                //设置行高
                headerRow.HeightInPoints = 35;
                headerRow.CreateCell(cellIndex).SetCellValue(dtSource.Columns[i].ToString());
                ICellStyle headStyle = workbook.CreateCellStyle();
                headStyle.WrapText = true;
                IFont font = workbook.CreateFont();
                //字体大小
                font.FontHeightInPoints = 12;
                font.Boldweight = 360;
                headStyle.SetFont(font);
                headerRow.GetCell(cellIndex).CellStyle = headStyle;
                cellIndex++;
            }
            #endregion

            #region 数据填充
            int rowIndex = 1;//行数一定要从1行开始,因为上面已经创建了表头为0行;
            DataView dvSource = dtSource.DefaultView;

            foreach (DataRow row in dtSource.Rows)
            {
                int ColumnIndex = 0;
                IRow dataRow = sheet.CreateRow(rowIndex);
                foreach (DataColumn column in dtSource.Columns)
                {
                    //序号
                    ICell newCel0 = dataRow.CreateCell(ColumnIndex);
                    ICellStyle style0 = workbook.CreateCellStyle();
                    style0.DataFormat = format.GetFormat("text");//数据类型
                    newCel0.SetCellValue(row[column.ColumnName].ToString());
                    ColumnIndex++;
                }
                rowIndex++;
            }
            #endregion

            #region 保存到指定位置
            MemoryStream stream = new MemoryStream();
            workbook.Write(stream);
            var buf = stream.ToArray();
            using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
            {
                fs.Write(buf, 0, buf.Length);
                fs.Flush();
            }
            #endregion

}

感谢各位的阅读,以上就是“C#中怎么使用Npoi导出Excel合并行列”的内容了,经过本文的学习后,相信大家对C#中怎么使用Npoi导出Excel合并行列这一问题有了更深刻的体会,具体使用情况还需要大家实践验证。这里是亿速云,小编将为大家推送更多相关知识点的文章,欢迎关注!

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