NPOI实现两级分组合并功能(示例讲解)

/// <summary>
/// 根据模版导出Excel -- 特别处理,每个分组带合计
/// </summary>
/// <param name="source">源DataTable</param>
/// <param name="cellKeys">需要导出的对应的列字段 例：string[] cellKeys = { "Date","Remarks" };</param>
/// <param name="strFileName">要保存的文件名称（包含后缀） 例："要保存的文件名.xls"</param>
/// <param name="templateFile">模版文件名（包含路径后缀） 例："模板文件名.xls"</param>
/// <param name="rowIndex">从第几行开始创建数据行,第一行为0</param>
/// <param name="mergeColumns">值相同时，可合并的前几列 最多支持2列 1=只合并第一列，2=判断前2列</param>
/// <param name="isConver">是否覆盖数据，=false，将把原数据下移。=true，将覆盖插入行后面的数据</param>
/// <param name="isTotal">是否带小计/合计项</param>
/// <param name="addAllTotal">是否添加总计项</param>
/// <returns>是否导出成功</returns>
public static bool Export2Template2(DataTable source, string[] cellKeys, string strFileName, string templateFile, int rowIndex, int mergeColumns, bool isConver, bool isTotal, bool addAllTotal)
{
 bool bn = false;
 int cellCount = cellKeys.Length; //总列数，第一列为0
 // IWorkbook workbook = null;
 HSSFWorkbook workbook = null;
 string temp0 = "", temp1 = "";
 int start0 = 0, start1 = 0; // 记录1，2列值相同的开始序号
 int end0 = 0, end1 = 0;// 记录1，2列值相同的结束序号
 
 try
 {
  using (FileStream file = new FileStream(templateFile, FileMode.Open, FileAccess.Read))
  {
   workbook = new HSSFWorkbook(file);
  }
 
  #region 定义四类数据的单元格样式
  // 内容数据格式 -- 数值
  ICellStyle styleNum = workbook.CreateCellStyle();
  styleNum.BorderBottom = BorderStyle.Thin;
  styleNum.BorderLeft = BorderStyle.Thin;
  styleNum.BorderRight = BorderStyle.Thin;
  styleNum.BorderTop = BorderStyle.Thin;
  // styleNum.VerticalAlignment = VerticalAlignment.Center;
  // styleNum.Alignment = HorizontalAlignment.Center;
 
  // 内容数据格式 -- 字符串（做居中处理）
  ICellStyle styleStr = workbook.CreateCellStyle();
  styleStr.BorderBottom = BorderStyle.Thin;
  styleStr.BorderLeft = BorderStyle.Thin;
  styleStr.BorderRight = BorderStyle.Thin;
  styleStr.BorderTop = BorderStyle.Thin;
  styleStr.VerticalAlignment = VerticalAlignment.Center;
  styleStr.Alignment = HorizontalAlignment.Center;
 
  // 汇总数据格式 -- 数值
  ICellStyle styleTotalNum = workbook.CreateCellStyle();
  styleTotalNum.BorderBottom = BorderStyle.Thin;
  styleTotalNum.BorderLeft = BorderStyle.Thin;
  styleTotalNum.BorderRight = BorderStyle.Thin;
  styleTotalNum.BorderTop = BorderStyle.Thin;
  styleTotalNum.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Grey25Percent.Index;
  styleTotalNum.FillPattern = FillPattern.SolidForeground;
  styleTotalNum.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.Red.Index;
  // 设置字体颜色
  HSSFFont ffont0 = (HSSFFont)workbook.CreateFont();
  // ffont0.FontHeight = 14 * 14;
  // ffont0.FontName = "宋体";
  ffont0.IsBold = true;
  //ffont0.Color = HSSFColor.Red.Index;
  styleTotalNum.SetFont(ffont0);
 
  // 汇总数据格式 -- 字符串（做居中处理）
  ICellStyle styleTotalStr = workbook.CreateCellStyle();
  styleTotalStr.BorderBottom = BorderStyle.Thin;
  styleTotalStr.BorderLeft = BorderStyle.Thin;
  styleTotalStr.BorderRight = BorderStyle.Thin;
  styleTotalStr.BorderTop = BorderStyle.Thin;
  styleTotalStr.VerticalAlignment = VerticalAlignment.Center;
  styleTotalStr.Alignment = HorizontalAlignment.Center;
  styleTotalStr.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.Grey25Percent.Index;
  styleTotalStr.FillPattern = FillPattern.SolidForeground;
  // 设置字体颜色
  HSSFFont ffont1 = (HSSFFont)workbook.CreateFont();
  // ffont1.FontHeight = 14 * 14;
  // ffont1.FontName = "宋体";
  ffont1.IsBold = true;
  //ffont.Color = HSSFColor.Red.Index;
  styleTotalStr.SetFont(ffont1);
  #endregion
 
  ISheet sheet = workbook.GetSheetAt(0); // 打开第一个sheet页
  if (sheet != null && source != null && source.Rows.Count > 0) // 模板内容为空，不做处理
  {
   IRow row;
   for (int i = 0, len = source.Rows.Count; i < len; i++)
   {
    if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
    #region 第一行，写入数据后，对变量赋初值
    if (i == 0) // 第一行，赋初值
    {
     row = sheet.CreateRow(rowIndex);
     #region 创建列并插入数据
     //创建列并插入数据
     for (int index = 0; index < cellCount; index++)
     {
      ICell cell = row.CreateCell(index);
 
      string strValue = !(source.Rows[i][cellKeys[index]] is DBNull) ? source.Rows[i][cellKeys[index]].ToString() : string.Empty;
      // 其它列数据，数值进行汇总
      switch (source.Columns[cellKeys[index]].DataType.ToString())
      {
       case "System.Int16": //整型
       case "System.Int32":
       case "System.Int64":
       case "System.Byte":
        int intV = 0;
        int.TryParse(strValue, out intV);
        cell.CellStyle = styleNum; // 设置格式
        cell.SetCellValue(intV);
        break;
       case "System.Decimal": //浮点型
       case "System.Double":
       case "System.Single":
        double doubV = 0;
        double.TryParse(strValue, out doubV);
        cell.CellStyle = styleNum; // 设置格式
        cell.SetCellValue(doubV);
        break;
       default:
        cell.CellStyle = styleStr; // 设置格式
        cell.SetCellValue(strValue);
        break;
      }
     }
     #endregion
 
     if (mergeColumns > 0)
     {
      temp0 = source.Rows[i][cellKeys[0]].ToString(); // 保存第1列值
      start0 = rowIndex;
      end0 = rowIndex;
     }
     if (mergeColumns > 1)
     {
      temp1 = source.Rows[i][cellKeys[1]].ToString(); // 保存第2列值     
      start1 = rowIndex;
      end1 = rowIndex;
     }
 
     rowIndex++;
     continue;
    }
    #endregion
 
    // 不是第一行数据的处理
    // 判断1列值变化没
    string cellText0 = source.Rows[i][cellKeys[0]].ToString();
    if (temp0 != cellText0) // 第1列值有变化
    {
     #region 第2列要合并
     if (mergeColumns > 1) // 第2列要合并
     {
      if (start1 != end1) // 开始行和结束行不相同，才进行合并
      {
       CellRangeAddress region1 = new CellRangeAddress(start1, end1, 1, 1); // 合并第二列
       sheet.AddMergedRegion(region1);
      }
 
      #region 第2列加小计
      if (isTotal) // 加小计
      {
       if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
       IRow rowTotal1 = sheet.CreateRow(rowIndex);
       //创建列并插入数据
       #region 插入小计数据
       for (int index = 0; index < cellCount; index++)
       {
        object obj1;
        ICell newcell = rowTotal1.CreateCell(index);
        if (index == 0) //第1列
        {
         newcell.CellStyle = styleTotalStr;
         newcell.SetCellValue(temp0);
         continue;
        }
        if (index == 1) // 第2列
        {
         newcell.CellStyle = styleTotalStr;
         newcell.SetCellValue("小计");
         continue;
        }
 
        // 其它列数据，数值进行汇总
        switch (source.Columns[cellKeys[index]].DataType.ToString())
        {
         case "System.Int16": //整型
         case "System.Int32":
         case "System.Int64":
         case "System.Byte":
          obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' and {2} = '{3}' ", cellKeys[0], temp0, cellKeys[1], temp1));
          int intV = 0;
          int.TryParse(obj1.ToString(), out intV);
          newcell.CellStyle = styleTotalNum;
          newcell.SetCellValue(intV);
          break;
         case "System.Decimal": //浮点型
         case "System.Double":
         case "System.Single":
          obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' and {2} = '{3}' ", cellKeys[0], temp0, cellKeys[1], temp1));
          double doubV = 0;
          double.TryParse(obj1.ToString(), out doubV);
          newcell.CellStyle = styleTotalNum;
          newcell.SetCellValue(doubV);
          break;
         default:
          newcell.CellStyle = styleTotalStr;
          newcell.SetCellValue("");
          break;
        }
       }
       #endregion
 
       // 合并小计
       CellRangeAddress region0 = new CellRangeAddress(rowIndex, rowIndex, 1, 2); // 合并小计
       sheet.AddMergedRegion(region0);
 
      }
      #endregion
      temp1 = source.Rows[i][cellKeys[1]].ToString();
      end0++;
      rowIndex++;
     }
     #endregion
 
     #region 第1列要合并
     if (mergeColumns > 0) // 第1列要合并
     {
      if (start0 != end0) // 开始行和结束行不相同，才进行合并
      {
       CellRangeAddress region0 = new CellRangeAddress(start0, end0, 0, 0); // 合并第二列
       sheet.AddMergedRegion(region0);
      }
 
      #region 第1列加合计
      if (isTotal) // 加合计
      {
       if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
       IRow rowTotal0 = sheet.CreateRow(rowIndex);
       //创建列并插入数据
       #region 加合计列
       for (int index = 0; index < cellCount; index++)
       {
        object obj1;
        ICell newcell = rowTotal0.CreateCell(index);
        if (index == 0)
        {
         newcell.CellStyle = styleTotalStr;
         newcell.SetCellValue("合计"); //第1列
         continue;
        }
        if (index == 1)
        {
         newcell.CellStyle = styleTotalStr;
         newcell.SetCellValue(""); // 第2列
         continue;
        }
 
        switch (source.Columns[cellKeys[index]].DataType.ToString())
        {
         case "System.Int16": //整型
         case "System.Int32":
         case "System.Int64":
         case "System.Byte":
          obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' ", cellKeys[0], temp0));
          int intV = 0;
          int.TryParse(obj1.ToString(), out intV);
          newcell.CellStyle = styleTotalNum;
          newcell.SetCellValue(intV);
          break;
         case "System.Decimal": //浮点型
         case "System.Double":
         case "System.Single":
          obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' ", cellKeys[0], temp0));
          double doubV = 0;
          double.TryParse(obj1.ToString(), out doubV);
          newcell.CellStyle = styleTotalNum;
          newcell.SetCellValue(doubV);
          break;
         default:
          newcell.CellStyle = styleTotalStr;
          newcell.SetCellValue("");
          break;
        }
       }
       #endregion
 
       // 合并合计
       CellRangeAddress region0 = new CellRangeAddress(rowIndex, rowIndex, 0, 2); // 合并合计
       sheet.AddMergedRegion(region0);
 
       end0++;
       rowIndex++;
      }
      #endregion
      temp0 = cellText0;
     }
     #endregion
 
     // 重新赋值
     start0 = rowIndex;
     end0 = rowIndex;
     start1 = rowIndex;
     end1 = rowIndex;
    }
    else // 第1列值没有变化
    {
     end0++;
     // 判断第2列是否有变化
     string cellText1 = source.Rows[i][cellKeys[1]].ToString();
     if (cellText1 != temp1) // 第1列没变，第2列变化
     {
      #region 第2列要合并
      if (mergeColumns > 1) // 第2列要合并
      {
       if (start1 != end1) // 开始行和结束行不相同，才进行合并
       {
        CellRangeAddress region1 = new CellRangeAddress(start1, end1, 1, 1); // 合并第二列
        sheet.AddMergedRegion(region1);
       }
 
       #region 第2列加小计
       if (isTotal) // 加小计
       {
        if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
        IRow rowTotal1 = sheet.CreateRow(rowIndex);
        //创建列并插入数据
        #region 插入小计数据
        for (int index = 0; index < cellCount; index++)
        {
         object obj1;
         ICell newcell = rowTotal1.CreateCell(index);
         if (index == 0) //第1列
         {
          newcell.CellStyle = styleTotalStr;
          newcell.SetCellValue(temp0);
          continue;
         }
         if (index == 1) // 第2列
         {
          newcell.CellStyle = styleTotalStr;
          newcell.SetCellValue("小计");
          continue;
         }
 
         // 其它列数据，数值进行汇总
         switch (source.Columns[cellKeys[index]].DataType.ToString())
         {
          case "System.Int16": //整型
          case "System.Int32":
          case "System.Int64":
          case "System.Byte":
           obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' and {2} = '{3}' ", cellKeys[0], temp0, cellKeys[1], temp1));
           int intV = 0;
           int.TryParse(obj1.ToString(), out intV);
           newcell.CellStyle = styleTotalNum;
           newcell.SetCellValue(intV);
           break;
          case "System.Decimal": //浮点型
          case "System.Double":
          case "System.Single":
           obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' and {2} = '{3}' ", cellKeys[0], temp0, cellKeys[1], temp1));
           double doubV = 0;
           double.TryParse(obj1.ToString(), out doubV);
           newcell.CellStyle = styleTotalNum;
           newcell.SetCellValue(doubV);
           break;
          default:
           newcell.CellStyle = styleTotalStr;
           newcell.SetCellValue("");
           break;
         }
        }
        #endregion
        // 合并小计
        CellRangeAddress region0 = new CellRangeAddress(rowIndex, rowIndex, 1, 2); // 合并小计
        sheet.AddMergedRegion(region0);
 
        end0++;
        rowIndex++;
       }
       temp1 = cellText1; // 要合并，才进行重新赋值
       start1 = rowIndex;
       end1 = rowIndex;
       #endregion
      }
      #endregion
     }
     else // 第1列值没变，第2列也没变
      end1++;
    }
 
    // 插入当前数据
    row = sheet.CreateRow(rowIndex);
    #region 创建行并插入当前记录的数据
    //创建行并插入当前记录的数据
    for (int index = 0; index < cellCount; index++)
    {
     ICell cell = row.CreateCell(index);<br>
     string strValue = !(source.Rows[i][cellKeys[index]] is DBNull) ? source.Rows[i][cellKeys[index]].ToString() : string.Empty; // 取值
     switch (source.Columns[cellKeys[index]].DataType.ToString())
     {
      case "System.Int16": //整型
      case "System.Int32":
      case "System.Int64":
      case "System.Byte":
       int intV = 0;
       int.TryParse(strValue, out intV);
       cell.CellStyle = styleNum;
       cell.SetCellValue(intV);
       break;
      case "System.Decimal": //浮点型
      case "System.Double":
      case "System.Single":
       double doubV = 0;
       double.TryParse(strValue, out doubV);
       cell.CellStyle = styleNum;
       cell.SetCellValue(doubV);
       break;
      default:
       cell.CellStyle = styleStr;
       cell.SetCellValue(strValue);
       break;
     }
    }
    #endregion
    // 下移一行
    rowIndex++;
   }
 
   // 最后一条记录的合计
   #region 对第2列进行合并
   if (mergeColumns > 1) // 对第2列合并
   {
    if (start1 != end1) // 开始行和结束行不等，进行合并
    {
     CellRangeAddress region1 = new CellRangeAddress(start1, end1, 1, 1); // 合并第二列
     sheet.AddMergedRegion(region1);
    }
 
    #region 第2列加小计
    if (isTotal) // 加小计
    {
     if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
     IRow rowTotal1 = sheet.CreateRow(rowIndex);
     //创建列并插入数据
     #region 插入小计数据
     for (int index = 0; index < cellCount; index++)
     {
      object obj1;
      ICell newcell = rowTotal1.CreateCell(index);
      #region 列值处理
      if (index == 0) //第1列
      {
       newcell.CellStyle = styleTotalStr;
       newcell.SetCellValue(temp0);
       continue;
      }
      if (index == 1) // 第2列
      {
       newcell.CellStyle = styleTotalStr;
       newcell.SetCellValue("小计");
       continue;
      }
 
      // 其它列数据，数值进行汇总
      switch (source.Columns[cellKeys[index]].DataType.ToString())
      {
       case "System.Int16": //整型
       case "System.Int32":
       case "System.Int64":
       case "System.Byte":
        obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' and {2} = '{3}' ", cellKeys[0], temp0, cellKeys[1], temp1));
        int intV = 0;
        int.TryParse(obj1.ToString(), out intV);
        newcell.CellStyle = styleTotalNum;
        newcell.SetCellValue(intV);
        break;
       case "System.Decimal": //浮点型
       case "System.Double":
       case "System.Single":
        obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' and {2} = '{3}' ", cellKeys[0], temp0, cellKeys[1], temp1));
        double doubV = 0;
        double.TryParse(obj1.ToString(), out doubV);
        newcell.CellStyle = styleTotalNum;
        newcell.SetCellValue(doubV);
        break;
       default:
        newcell.CellStyle = styleTotalStr;
        newcell.SetCellValue("");
        break;
      }
      #endregion
     }
     #endregion
     // 合并小计
     CellRangeAddress region0 = new CellRangeAddress(rowIndex, rowIndex, 1, 2); // 合并小计
     sheet.AddMergedRegion(region0);
 
     rowIndex++;
     end0++;
    }
    #endregion
   }
   #endregion
 
   #region 对第1列合并
   if (mergeColumns > 0) // 对第1列合并
   {
    if (start0 != end0) // 开始行和结束行不等，进行合并
    {
     CellRangeAddress region1 = new CellRangeAddress(start0, end0, 0, 0); // 合并第二列
     sheet.AddMergedRegion(region1);
    }
 
    #region 第1列加合计
    if (isTotal) // 加合计
    {
     if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
     IRow rowTotal0 = sheet.CreateRow(rowIndex);
     //创建列并插入数据
     #region 插入合计数据
     for (int index = 0; index < cellCount; index++)
     {
      object obj1;
      ICell newcell = rowTotal0.CreateCell(index);
      #region 列值处理
      if (index == 0) //第1列
      {
       newcell.CellStyle = styleTotalStr;
       newcell.SetCellValue("合计");
       continue;
      }
      if (index == 1) // 第2列
      {
       newcell.CellStyle = styleTotalStr;
       newcell.SetCellValue("");
       continue;
      }
 
      // 其它列数据，数值进行汇总
      switch (source.Columns[cellKeys[index]].DataType.ToString())
      {
       case "System.Int16": //整型
       case "System.Int32":
       case "System.Int64":
       case "System.Byte":
        obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' ", cellKeys[0], temp0));
        int intV = 0;
        newcell.CellStyle = styleTotalNum;
        int.TryParse(obj1.ToString(), out intV);
        newcell.SetCellValue(intV);
        break;
       case "System.Decimal": //浮点型
       case "System.Double":
       case "System.Single":
        obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), string.Format("{0} = '{1}' ", cellKeys[0], temp0));
        double doubV = 0;
        double.TryParse(obj1.ToString(), out doubV);
        newcell.CellStyle = styleTotalNum;
        newcell.SetCellValue(doubV);
        break;
       default:
        newcell.CellStyle = styleTotalStr;
        newcell.SetCellValue("");
        break;
      }
      #endregion
     }
     #endregion
 
     // 合并合计
     CellRangeAddress region0 = new CellRangeAddress(rowIndex, rowIndex, 0, 2); // 合并合计
     sheet.AddMergedRegion(region0);
 
    }
    rowIndex++;
    #endregion
   }
   #endregion
 
 
 
   #region 进行汇总 - 加总计     
   if (addAllTotal) // 加总计
   {
    if (!isConver) sheet.ShiftRows(rowIndex, sheet.LastRowNum, 1, true, false); // 不覆盖，数据向下移
 
    IRow rowTotal0 = sheet.CreateRow(rowIndex);
    //创建列并插入数据
    #region 插入总计数据
    for (int index = 0; index < cellCount; index++)
    {
     object obj1;
     ICell newcell = rowTotal0.CreateCell(index);
     #region 列值处理
     if (index == 0) //第1列
     {
      newcell.CellStyle = styleTotalStr;
      newcell.SetCellValue("总计");
      continue;
     }
     if (index == 1) // 第2列
     {
      newcell.CellStyle = styleTotalStr;
      newcell.SetCellValue("");
      continue;
     }
 
     // 其它列数据，数值进行汇总
     switch (source.Columns[cellKeys[index]].DataType.ToString())
     {
      case "System.Int16": //整型
      case "System.Int32":
      case "System.Int64":
      case "System.Byte":
       obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), "");
       int intV = 0;
       int.TryParse(obj1.ToString(), out intV);
       newcell.CellStyle = styleTotalNum;
       newcell.SetCellValue(intV);
       break;
      case "System.Decimal": //浮点型
      case "System.Double":
      case "System.Single":
       obj1 = source.Compute(string.Format("sum({0})", cellKeys[index]), "");
       double doubV = 0;
       double.TryParse(obj1.ToString(), out doubV);
       newcell.CellStyle = styleTotalNum;
       newcell.SetCellValue(doubV);
       break;
      default:
       newcell.CellStyle = styleTotalStr;
       newcell.SetCellValue("");
       break;
     }
     #endregion
    }
    #endregion
 
    // 合并总计
    CellRangeAddress region0 = new CellRangeAddress(rowIndex, rowIndex, 0, 2); // 合并总计
    sheet.AddMergedRegion(region0);
 
   }
   #endregion
 
  }
  return Save2Xls(strFileName, workbook); // 保存为xls文件
 }
 catch (Exception ex)
 {
  // FileHelper.WriteLine(logfile, "处理数据异常：" + ex.Message);
  // msg = ex.Message;
 }
 return bn;
}

public static bool Save2Xls(string fileName, IWorkbook workbook)
{
 bool bn = false;
 try
 {
  FileStream fs = new FileStream(fileName, FileMode.OpenOrCreate);
 
  MemoryStream ms = new MemoryStream();
  workbook.Write(ms);
  BinaryWriter w = new BinaryWriter(fs);
  w.Write(ms.ToArray());
  fs.Close();
  ms.Close();
 
  bn = true;
 }
 catch(Exception ex)
 {
  //FileHelper.WriteLine(logfile, "保存文件异常：" + ex.Message);
 }
 return bn;
}