首先，通过NuGet添加NPOI.

NPOI依赖SharpZipLib，通过NuGet添加SharpZipLib.

然后添加NPOI.

添加后项目的引用列表如下：

把DataTable转换成Excel文件。

代码如下：

  1.         public static MemoryStream RenderDataTableToExcel(DataTable table)
  2.         {
  3.             MemoryStream ms = new MemoryStream();
  4.  
  5.             IWorkbook workbook = new HSSFWorkbook();
  6.             ISheet sheet = workbook.CreateSheet(table.TableName);
  7.  
  8.             for (int rowIndex = ; rowIndex < table.Rows.Count; rowIndex++)
  9.             {
  10.                 IRow dataRow = sheet.CreateRow(rowIndex);
  11.                 foreach (DataColumn column in table.Columns)
  12.                 {
  13.                     dataRow.CreateCell(column.Ordinal).SetCellValue(table.Rows[rowIndex][column].ToString());
  14.                 }
  15.             }
  16.  
  17.             workbook.Write(ms);
  18.             ms.Close();
  19.  
  20.             return ms;
  21.         }

转换Excel文件内容如下:

Excel文件添加表头

代码：

  1.         public static MemoryStream RenderDataTableToExcelWithHeader(DataTable table)
  2.         {
  3.             MemoryStream ms = new MemoryStream();
  4.  
  5.             IWorkbook workbook = new HSSFWorkbook();
  6.             ISheet sheet = workbook.CreateSheet(table.TableName);
  7.             IRow headerRow = sheet.CreateRow();
  8.             foreach (DataColumn column in table.Columns)
  9.             {
  10.                 headerRow.CreateCell(column.Ordinal).SetCellValue(string.Format("    {0}    ", column.Caption));
  11.             }
  12.  
  13.             for (int rowIndex = ; rowIndex < table.Rows.Count; rowIndex++)
  14.             {
  15.                 IRow dataRow = sheet.CreateRow(rowIndex+);
  16.                 foreach (DataColumn column in table.Columns)
  17.                 {
  18.                     dataRow.CreateCell(column.Ordinal).SetCellValue(table.Rows[rowIndex][column].ToString());
  19.                 }
  20.             }
  21.  
  22.             workbook.Write(ms);
  23.             ms.Close();
  24.  
  25.             return ms;
  26.         }

转换Excel文件内容如下:

添加Excel文件添加表头样式

代码：

  1. public static MemoryStream RenderDataTableToExcelWithHeaderRowStyle(DataTable table)
  2.         {
  3.             MemoryStream ms = new MemoryStream();
  4.  
  5.             IWorkbook workbook = new HSSFWorkbook();
  6.             ISheet sheet = workbook.CreateSheet(table.TableName);
  7.             IRow headerRow = sheet.CreateRow();
  8.  
  9.             ICellStyle headStyle = workbook.CreateCellStyle();
  10.             headStyle.Alignment = HorizontalAlignment.Center;
  11.             headStyle.FillForegroundColor = HSSFColor.Grey25Percent.Index;
  12.             headStyle.FillPattern = FillPattern.SolidForeground;
  13.             IFont font = workbook.CreateFont();
  14.             font.FontName = "Microsoft Yahei";
  15.             font.FontHeightInPoints = ;
  16.             font.IsBold = true;
  17.             font.Color = HSSFColor.White.Index;
  18.             headStyle.SetFont(font);
  19.             headStyle.BorderBottom = BorderStyle.Thin;
  20.             headStyle.BorderRight = BorderStyle.Thin;
  21.             headStyle.BorderLeft = BorderStyle.Thin;
  22.  
  23.             foreach (DataColumn column in table.Columns)
  24.             {
  25.                 ICell cell = headerRow.CreateCell(column.Ordinal);
  26.                 cell.SetCellValue(string.Format("    {0}    ", column.Caption));
  27.                 cell.CellStyle = headStyle;
  28.             }
  29.  
  30.             for (int rowIndex = ; rowIndex < table.Rows.Count; rowIndex++)
  31.             {
  32.                 IRow dataRow = sheet.CreateRow(rowIndex + );
  33.                 foreach (DataColumn column in table.Columns)
  34.                 {
  35.                     dataRow.CreateCell(column.Ordinal).SetCellValue(table.Rows[rowIndex][column].ToString());
  36.                 }
  37.             }
  38.  
  39.             workbook.Write(ms);
  40.             ms.Close();
  41.  
  42.             return ms;
  43.         }

转换Excel文件内容如下:

添加Excel文件添加数据行样式

代码：

  1. public static MemoryStream RenderDataTableToExcelWithDataRowStyle(DataTable table)
  2.         {
  3.             MemoryStream ms = new MemoryStream();
  4.  
  5.             IWorkbook workbook = new HSSFWorkbook();
  6.             ISheet sheet = workbook.CreateSheet(table.TableName);
  7.             IRow headerRow = sheet.CreateRow();
  8.  
  9.             ICellStyle headStyle = workbook.CreateCellStyle();
  10.             headStyle.Alignment = HorizontalAlignment.Center;
  11.             headStyle.FillForegroundColor = HSSFColor.Grey25Percent.Index;
  12.             headStyle.FillPattern = FillPattern.SolidForeground;
  13.             IFont font = workbook.CreateFont();
  14.             font.FontName = "Microsoft Yahei";
  15.             font.FontHeightInPoints = ;
  16.             font.IsBold = true;
  17.             font.Color = HSSFColor.White.Index;
  18.             headStyle.SetFont(font);
  19.             headStyle.BorderBottom = BorderStyle.Thin;
  20.             headStyle.BorderRight = BorderStyle.Thin;
  21.             headStyle.BorderLeft = BorderStyle.Thin;
  22.  
  23.             ICellStyle dataRowEvenStyle = workbook.CreateCellStyle();
  24.             dataRowEvenStyle.Alignment = HorizontalAlignment.Center;
  25.             dataRowEvenStyle.FillForegroundColor = HSSFColor.LightOrange.Index;
  26.             dataRowEvenStyle.FillPattern = FillPattern.SolidForeground;
  27.             IFont dataRowEvenFont = workbook.CreateFont();
  28.             dataRowEvenFont.FontName = "Microsoft Yahei";
  29.             dataRowEvenFont.FontHeightInPoints = ;
  30.             dataRowEvenFont.Color = HSSFColor.Blue.Index;
  31.             dataRowEvenStyle.SetFont(dataRowEvenFont);
  32.             dataRowEvenStyle.BorderBottom = BorderStyle.Thin;
  33.             dataRowEvenStyle.BorderRight = BorderStyle.Thin;
  34.             dataRowEvenStyle.BorderLeft = BorderStyle.Thin;
  35.  
  36.             ICellStyle dataRowOddStyle = workbook.CreateCellStyle();
  37.             dataRowOddStyle.Alignment = HorizontalAlignment.Center;
  38.             dataRowOddStyle.FillForegroundColor = HSSFColor.LightGreen.Index;
  39.             dataRowOddStyle.FillPattern = FillPattern.SolidForeground;
  40.             IFont dataRowOddFont = workbook.CreateFont();
  41.             dataRowOddFont.FontName = "Microsoft Yahei";
  42.             dataRowOddFont.FontHeightInPoints = ;
  43.             dataRowOddFont.Color = HSSFColor.Black.Index;
  44.             dataRowOddStyle.SetFont(dataRowOddFont);
  45.             dataRowOddStyle.BorderBottom = BorderStyle.Thin;
  46.             dataRowOddStyle.BorderRight = BorderStyle.Thin;
  47.             dataRowOddStyle.BorderLeft = BorderStyle.Thin;
  48.  
  49.             foreach (DataColumn column in table.Columns)
  50.             {
  51.                 ICell cell = headerRow.CreateCell(column.Ordinal);
  52.                 cell.SetCellValue(string.Format("    {0}    ", column.Caption));
  53.                 cell.CellStyle = headStyle;
  54.             }
  55.  
  56.             for (int rowIndex = ; rowIndex < table.Rows.Count; rowIndex++)
  57.             {
  58.                 IRow dataRow = sheet.CreateRow(rowIndex + );
  59.                 foreach (DataColumn column in table.Columns)
  60.                 {
  61.                     ICell cell = dataRow.CreateCell(column.Ordinal);
  62.                     cell.SetCellValue(table.Rows[rowIndex][column].ToString());
  63.                     if (rowIndex %  == )
  64.                     {
  65.                         cell.CellStyle = dataRowEvenStyle;
  66.                     }
  67.                     else
  68.                     {
  69.                         cell.CellStyle = dataRowOddStyle;
  70.                     }
  71.                 }
  72.             }
  73.  
  74.             workbook.Write(ms);
  75.             ms.Close();
  76.  
  77.             return ms;
  78.         }

转换Excel文件内容如下:

Excel文件合并单元格

代码：

  1. public static MemoryStream RenderDataTableToExcelMergedRegion(DataTable table)
  2.         {
  3.             MemoryStream ms = new MemoryStream();
  4.  
  5.             IWorkbook workbook = new HSSFWorkbook();
  6.             ISheet sheet = workbook.CreateSheet(table.TableName);
  7.             IRow headerRow = sheet.CreateRow();
  8.  
  9.             ICellStyle headStyle = workbook.CreateCellStyle();
  10.             headStyle.Alignment = HorizontalAlignment.Center;
  11.             headStyle.FillForegroundColor = HSSFColor.Grey25Percent.Index;
  12.             headStyle.FillPattern = FillPattern.SolidForeground;
  13.             IFont font = workbook.CreateFont();
  14.             font.FontName = "Microsoft Yahei";
  15.             font.FontHeightInPoints = ;
  16.             font.IsBold = true;
  17.             font.Color = HSSFColor.White.Index;
  18.             headStyle.SetFont(font);
  19.             headStyle.BorderBottom = BorderStyle.Thin;
  20.             headStyle.BorderRight = BorderStyle.Thin;
  21.             headStyle.BorderLeft = BorderStyle.Thin;
  22.  
  23.             ICellStyle dataRowEvenStyle = workbook.CreateCellStyle();
  24.             dataRowEvenStyle.Alignment = HorizontalAlignment.Center;
  25.             dataRowEvenStyle.FillForegroundColor = HSSFColor.LightOrange.Index;
  26.             dataRowEvenStyle.FillPattern = FillPattern.SolidForeground;
  27.             IFont dataRowEvenFont = workbook.CreateFont();
  28.             dataRowEvenFont.FontName = "Microsoft Yahei";
  29.             dataRowEvenFont.FontHeightInPoints = ;
  30.             dataRowEvenFont.Color = HSSFColor.Blue.Index;
  31.             dataRowEvenStyle.SetFont(dataRowEvenFont);
  32.             dataRowEvenStyle.BorderBottom = BorderStyle.Thin;
  33.             dataRowEvenStyle.BorderRight = BorderStyle.Thin;
  34.             dataRowEvenStyle.BorderLeft = BorderStyle.Thin;
  35.  
  36.             ICellStyle dataRowOddStyle = workbook.CreateCellStyle();
  37.             dataRowOddStyle.Alignment = HorizontalAlignment.Center;
  38.             dataRowOddStyle.FillForegroundColor = HSSFColor.LightGreen.Index;
  39.             dataRowOddStyle.FillPattern = FillPattern.SolidForeground;
  40.             IFont dataRowOddFont = workbook.CreateFont();
  41.             dataRowOddFont.FontName = "Microsoft Yahei";
  42.             dataRowOddFont.FontHeightInPoints = ;
  43.             dataRowOddFont.Color = HSSFColor.Black.Index;
  44.             dataRowOddStyle.SetFont(dataRowOddFont);
  45.             dataRowOddStyle.BorderBottom = BorderStyle.Thin;
  46.             dataRowOddStyle.BorderRight = BorderStyle.Thin;
  47.             dataRowOddStyle.BorderLeft = BorderStyle.Thin;
  48.  
  49.             foreach (DataColumn column in table.Columns)
  50.             {
  51.                 ICell cell = headerRow.CreateCell(column.Ordinal);
  52.                 cell.SetCellValue(string.Format("    {0}    ", column.Caption));
  53.                 cell.CellStyle = headStyle;
  54.             }
  55.  
  56.             for (int rowIndex = ; rowIndex < table.Rows.Count; rowIndex++)
  57.             {
  58.                 IRow dataRow = sheet.CreateRow(rowIndex + );
  59.                 foreach (DataColumn column in table.Columns)
  60.                 {
  61.                     ICell cell = dataRow.CreateCell(column.Ordinal);
  62.                     cell.SetCellValue(table.Rows[rowIndex][column].ToString());
  63.                     if (rowIndex %  == )
  64.                     {
  65.                         cell.CellStyle = dataRowEvenStyle;
  66.                     }
  67.                     else
  68.                     {
  69.                         cell.CellStyle = dataRowOddStyle;
  70.                     }
  71.                 }
  72.             }
  73.  
  74.             sheet.AddMergedRegion(new CellRangeAddress(, , , ));
  75.             sheet.AddMergedRegion(new CellRangeAddress(, , , ));
  76.             sheet.AddMergedRegion(new CellRangeAddress(, , , ));
  77.             sheet.AddMergedRegion(new CellRangeAddress(, , , ));
  78.             sheet.AddMergedRegion(new CellRangeAddress(, , , ));
  79.  
  80.             workbook.Write(ms);
  81.             ms.Close();
  82.  
  83.             return ms;
  84.         }

转换Excel文件内容如下:

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