C# 之 用NPOI類庫操作Excel

1、需引用以下命名空間：

using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.HPSF;
using NPOI.HSSF.Util;

2、接下來在內存中生成一個Excel文件，代碼如下：

 HSSFWorkbook book = new HSSFWorkbook();
 ISheet sheet = book.CreateSheet("Sheet1");

 

3、然后在新創建的sheet里面，創建我們的行和列，代碼如下：

IRow row = sheet.CreateRow(index); //index代表多少行
row.HeightInPoints = 35; //行高
ICell cell = row.CreateCell(0); //創建第一列
cell.SetCellValue("設置單元格的值"); //設置單元格的值

4、設置單元格的樣式已經字體大小，邊框，以及合並單元格

(1).創建單元格字體的樣式及大小

        /// <summary>
        /// 獲取字體樣式
        /// </summary>
        /// <param name="hssfworkbook">Excel操作類</param>
        /// <param name="fontname">字體名</param>
        /// <param name="fontcolor">字體顏色</param>
        /// <param name="fontsize">字體大小</param>
        /// <returns></returns>
        public static IFont GetFontStyle(HSSFWorkbook hssfworkbook, string fontfamily, HSSFColor fontcolor, int fontsize)
        {
            IFont font1 = hssfworkbook.CreateFont();
            if (string.IsNullOrEmpty(fontfamily))
            {
                font1.FontName = fontfamily;
            }
            if (fontcolor != null)
            {
                font1.Color = fontcolor.GetIndex();
            }
            font1.IsItalic = true;
            font1.FontHeightInPoints = (short)fontsize;
            return font1;
        }

 

(2).設置單元格內顯示數據的格式

 

ICell cell = row.CreateCell(1);
ICellStyle cellStyleNum = Excel.GetICellStyle(book);
IDataFormat formatNum = book.CreateDataFormat();
cellStyleNum.DataFormat = formatNum.GetFormat("0.00E+00");//設置單元格的格式為科學計數法cell.CellStyle = cellStyleNum;

 

(3).創建單元格的邊框，背景顏色，以及對齊方式

 

        /// <summary>
        /// 獲取單元格樣式
        /// </summary>
        /// <param name="hssfworkbook">Excel操作類</param>
        /// <param name="font">單元格字體</param>
        /// <param name="fillForegroundColor">圖案的顏色</param>
        /// <param name="fillPattern">圖案樣式</param>
        /// <param name="fillBackgroundColor">單元格背景</param>
        /// <param name="ha">垂直對齊方式</param>
        /// <param name="va">垂直對齊方式</param>
        /// <returns></returns>
        public static ICellStyle GetCellStyle(HSSFWorkbook hssfworkbook, IFont font, HSSFColor fillForegroundColor, FillPatternType fillPattern, 
　　　　　HSSFColor fillBackgroundColor, HorizontalAlignment ha, VerticalAlignment va)
        {
            ICellStyle cellstyle = hssfworkbook.CreateCellStyle();
            cellstyle.FillPattern = fillPattern;
            cellstyle.Alignment = ha;
            cellstyle.VerticalAlignment = va;
            if (fillForegroundColor != null)
            {
                cellstyle.FillForegroundColor = fillForegroundColor.GetIndex();
            }
            if (fillBackgroundColor != null)
            {
                cellstyle.FillBackgroundColor = fillBackgroundColor.GetIndex();
            }
            if (font != null)
            {
                cellstyle.SetFont(font);
            }
            //有邊框
            cellstyle.BorderBottom = CellBorderType.THIN;
            cellstyle.BorderLeft = CellBorderType.THIN;
            cellstyle.BorderRight = CellBorderType.THIN;
            cellstyle.BorderTop = CellBorderType.THIN;
            return cellstyle;
        }

 

(4).合並單元格　

        /// <summary>
        /// 合並單元格
        /// </summary>
        /// <param name="sheet">要合並單元格所在的sheet</param>
        /// <param name="rowstart">開始行的索引</param>
        /// <param name="rowend">結束行的索引</param>
        /// <param name="colstart">開始列的索引</param>
        /// <param name="colend">結束列的索引</param>
        public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend)
        {
            CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
            sheet.AddMergedRegion(cellRangeAddress);
        }

 

5、將Excel文件輸出

FileStream stream = File.OpenWrite(@"F:/test.xls"); ;
book.Write(stream);
stream.Close();

 

6、完整示例：

public MemoryStream RenderToExcelZBNew(DataTable table, string strHeaderText, string strDescText)
    {
        MemoryStream ms = new MemoryStream();

        using (table)
        {
            using (IWorkbook workbook = new HSSFWorkbook())
            {
                using (HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet())
                {
                    
        
                    //創建標題行
                    IRow titleRow = sheet.CreateRow(0);
                    //設置行高
                    titleRow.HeightInPoints = 45;
                    //設置Title
                    titleRow.CreateCell(0).SetCellValue(strHeaderText);
                    //設置樣式
                    titleRow.GetCell(0).CellStyle = CellStyle(workbook, CellStyleEnum.Title);
                    //合並單元格
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0, 0, 0, 13));
                    //設置邊框
                    sheet.SetEnclosedBorderOfRegion(new NPOI.SS.Util.CellRangeAddress(0, table.Rows.Count + 3, 0, 13), CellBorderType.THIN, NPOI.HSSF.Util.HSSFColor.BLACK.index);

                    //創建描述行
                    IRow descRow = sheet.CreateRow(1);
                    //設置行高
                    descRow.HeightInPoints = 50;
                    //設置Title
                    descRow.CreateCell(0).SetCellValue(strDescText);
                    //設置樣式
                    descRow.GetCell(0).CellStyle = CellStyle(workbook, CellStyleEnum.Desc);
                    //合並單元格
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(1, 1, 0, 13));
                    sheet.SetEnclosedBorderOfRegion(new NPOI.SS.Util.CellRangeAddress(1, 1, 0, 13), CellBorderType.THIN, NPOI.HSSF.Util.HSSFColor.BLACK.index);

                    IRow headerRow = sheet.CreateRow(2);
                    //設置行高
                    headerRow.HeightInPoints = 23;
                    headerRow.CreateCell(0).SetCellValue("序號");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 0, 0));
                    headerRow.GetCell(0).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(1).SetCellValue("日期");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 1, 1));
                    headerRow.GetCell(1).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(2).SetCellValue("時間");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 2, 2));
                    headerRow.GetCell(2).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(3).SetCellValue("事件");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 2, 3, 4));
                    headerRow.GetCell(3).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(5).SetCellValue("媒體");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 2, 5, 5));
                    headerRow.GetCell(5).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(6).SetCellValue("研判");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 2, 6, 6));
                    headerRow.GetCell(6).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    //headerRow.CreateCell(7).SetCellValue("風險等級");
                    //sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 7, 7));
                    //headerRow.GetCell(7).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(7).SetCellValue("責任單位");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 7, 7));
                    headerRow.GetCell(7).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(8).SetCellValue("落實部門");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 8, 8));
                    headerRow.GetCell(8).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(9).SetCellValue("處置");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 2, 9, 10));
                    headerRow.GetCell(9).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(11).SetCellValue("話題");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 2, 11, 12));
                    headerRow.GetCell(11).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    headerRow.CreateCell(13).SetCellValue("地址");
                    sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(2, 3, 13, 13));
                    headerRow.GetCell(13).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);


                    IRow headerRow2 = sheet.CreateRow(3);
                    headerRow2.HeightInPoints = 25;
                    headerRow2.CreateCell(0);
                    headerRow2.GetCell(0).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(1);
                    headerRow2.GetCell(1).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(2);
                    headerRow2.GetCell(2).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(7);
                    headerRow2.GetCell(7).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(8);
                    headerRow2.GetCell(8).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(9);
                    headerRow2.GetCell(9).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(3).SetCellValue("標題");
                    headerRow2.GetCell(3).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(4).SetCellValue("摘要");
                    headerRow2.GetCell(4).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(5).SetCellValue("名稱");
                    headerRow2.GetCell(5).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(6).SetCellValue("風險等級");
                    headerRow2.GetCell(6).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(9).SetCellValue("調查落實");
                    headerRow2.GetCell(9).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(10).SetCellValue("恢復引導");
                    headerRow2.GetCell(10).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(11).SetCellValue("類別");
                    headerRow2.GetCell(11).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(12).SetCellValue("關鍵詞一");
                    headerRow2.GetCell(12).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);
                    headerRow2.CreateCell(13);
                    headerRow2.GetCell(13).CellStyle = CellStyle(workbook, CellStyleEnum.Head2);

                    sheet.SetColumnWidth(0, 4 * 256);
                    sheet.SetColumnWidth(1, 6 * 256);
                    sheet.SetColumnWidth(2, 6 * 256);
                    sheet.SetColumnWidth(3, 25 * 256);
                    sheet.SetColumnWidth(4, 25 * 256);
                    sheet.SetColumnWidth(5, 5 * 256);
                    sheet.SetColumnWidth(6, 5 * 256);
                    sheet.SetColumnWidth(7, 5 * 256);
                    sheet.SetColumnWidth(8, 5 * 256);
                    sheet.SetColumnWidth(9, 18 * 256);
                    sheet.SetColumnWidth(10, 18 * 256);
                    sheet.SetColumnWidth(11, 6 * 256);
                    sheet.SetColumnWidth(12, 6 * 256);
                    sheet.SetColumnWidth(13, 18 * 256);

                    // 行號
                    int rowIndex = 4;

                    foreach (DataRow row in table.Rows)
                    {
                        IRow dataRow = sheet.CreateRow(rowIndex);
                        //dataRow.HeightInPoints = 70;//行高

                        int[] arrLenght = new int[3];
                        arrLenght[0] = row["SContent"].ToString().Length;
                        arrLenght[1] = row["STitle"].ToString().Length;
                        arrLenght[2] = row["SUrl"].ToString().Length;

                        if (arrLenght[0] > arrLenght[1])
                        {
                            if (arrLenght[0] > arrLenght[2])
                            {
                                //arrLenght[0] 最大
                                dataRow.HeightInPoints = arrLenght[0] + 15;
                            }
                            else
                            {
                                //arrLenght[2] 最大
                                dataRow.HeightInPoints = arrLenght[2] + 10;
                            }
                        }
                        else if (arrLenght[1] > arrLenght[2])
                        {
                            //arrLenght[1] 最大
                            dataRow.HeightInPoints = arrLenght[1] + 15;
                        }
                        else
                        {
                            //arrLenght[2] 最大
                            dataRow.HeightInPoints = arrLenght[2] + 10;
                        }

                        dataRow.CreateCell(0, CellType.STRING).SetCellValue(rowIndex - 3);
                        dataRow.CreateCell(1, CellType.STRING).SetCellValue(Convert.ToDateTime(row["SPostTime"]).ToString("MM.dd"));
                        dataRow.CreateCell(2, CellType.STRING).SetCellValue(Convert.ToDateTime(row["SPostTime"]).ToString("HH:mm"));
                        dataRow.CreateCell(3, CellType.STRING).SetCellValue(row["STitle"].ToString());
                        dataRow.CreateCell(4, CellType.STRING).SetCellValue(row["SContent"].ToString());
                        dataRow.CreateCell(5, CellType.STRING).SetCellValue(row["SMedia"].ToString());
                        if (row["SRank"].ToString() == "0")
                        {
                            dataRow.CreateCell(6, CellType.STRING).SetCellValue("");
                        }
                        else
                        {
                            dataRow.CreateCell(6, CellType.STRING).SetCellValue(_SGSentimentBLL.RankTitle(Convert.ToInt32(row["SRank"])));
                        }

                        if (!String.IsNullOrEmpty(row["SZone"].ToString()))
                        {
                            dataRow.CreateCell(7, CellType.STRING).SetCellValue(row["SZone"].ToString().Substring(0, 2) + "公司");
                        }
                        else
                        {
                            dataRow.CreateCell(7, CellType.STRING).SetCellValue(row["SZone"].ToString());
                        }
                        dataRow.CreateCell(8, CellType.STRING).SetCellValue(row["SAdvanceDeptName"].ToString());
                        dataRow.CreateCell(9, CellType.STRING).SetCellValue("");
                        dataRow.CreateCell(10, CellType.STRING).SetCellValue("");
                        dataRow.CreateCell(11, CellType.STRING).SetCellValue(row["TypeName"].ToString());
                        dataRow.CreateCell(12, CellType.STRING).SetCellValue(row["IssueName"].ToString());
                   
                        if (row["SUrl"].ToString().Contains("http://t.qq.com/") || row["SUrl"].ToString().Contains("http://weibo.com/"))
                        {
                            if (row["SUrl"].ToString().Length > 50)
                            {
                                dataRow.CreateCell(13, CellType.STRING).SetCellValue(row["SUrl"].ToString().Substring(50));
                            }
                            else
                            {
                                dataRow.CreateCell(13, CellType.STRING).SetCellValue(row["SUrl"].ToString());
                            }
                        }
                        else
                        {
                            dataRow.CreateCell(13, CellType.STRING).SetCellValue(row["SUrl"].ToString());
                        }

                        ICellStyle cellStyle = CellStyle(workbook, CellStyleEnum.Content2);
                        dataRow.GetCell(0).CellStyle = cellStyle;
                        dataRow.GetCell(1).CellStyle = cellStyle;
                        dataRow.GetCell(2).CellStyle = cellStyle;
                        dataRow.GetCell(3).CellStyle = cellStyle;
                        dataRow.GetCell(4).CellStyle = cellStyle;
                        dataRow.GetCell(5).CellStyle = cellStyle;
                        dataRow.GetCell(6).CellStyle = cellStyle;
                        dataRow.GetCell(7).CellStyle = cellStyle;
                        dataRow.GetCell(8).CellStyle = cellStyle;
                        dataRow.GetCell(9).CellStyle = cellStyle;
                        dataRow.GetCell(10).CellStyle = cellStyle;
                        dataRow.GetCell(11).CellStyle = cellStyle;
                        dataRow.GetCell(12).CellStyle = cellStyle;
                        dataRow.GetCell(13).CellStyle = cellStyle;

                        rowIndex++;
                    }
                    workbook.Write(ms);
                    ms.Flush();
                    ms.Position = 0;
                }
            }
        }
        return ms;
    }