關於NPOI導出Excel，設置表格樣式（合並單元格，表格線，批注）方法

/// <summary>
/// DataTable導出到Excel文件
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文本</param>
/// <param name="strFileName">保存位置</param>
public static void DataTableToExcel(DataTable dtSource, string strHeaderText, string strFileName)
{
using (MemoryStream ms = DataTableToExcel(dtSource, strHeaderText))
{
using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();
fs.Write(data, 0, data.Length);
fs.Flush();

}
}
}

/// <summary>
/// DataTable導出到Excel的MemoryStream
/// </summary>
/// <param name="dtSource">源DataTable</param>
/// <param name="strHeaderText">表頭文本</param>
public static MemoryStream DataTableToExcel(DataTable dtSource, string strHeaderText)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();

#region 右擊文件 屬性信息
{
DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
dsi.Company = "NPOI";
workbook.DocumentSummaryInformation = dsi;

SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
si.Author = "文件作者信息"; //填加xls文件作者信息
si.ApplicationName = "創建程序信息"; //填加xls文件創建程序信息
si.LastAuthor = "最后保存者信息"; //填加xls文件最后保存者信息
si.Comments = "作者信息"; //填加xls文件作者信息
si.Title = "標題信息"; //填加xls文件標題信息
si.Subject = "合理化建議平台";//填加文件主題信息
si.CreateDateTime = System.DateTime.Now;
workbook.SummaryInformation = si;
}
#endregion

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

//取得列寬
int[] arrColWidth = new int[dtSource.Columns.Count];
foreach (DataColumn item in dtSource.Columns)
{
arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
}
for (int i = 0; i < dtSource.Rows.Count; i++)
{
for (int j = 0; j < dtSource.Columns.Count; j++)
{
int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
if (intTemp > arrColWidth[j])
{
arrColWidth[j] = intTemp;
}
}
}
int rowIndex = 0;
foreach (DataRow row in dtSource.Rows)
{
#region 新建表，填充表頭，填充列頭，樣式
if (rowIndex == 65535 || rowIndex == 0)
{
if (rowIndex != 0)
{
sheet = (HSSFSheet)workbook.CreateSheet();
}

#region 表頭及樣式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(0);
headerRow.HeightInPoints = 25;
SetCellRangeAddress(sheet, 0, 0, 0, 11);
SetCellRangeAddress(sheet, 0, 0, 12, 18);
SetCellRangeAddress(sheet, 0, 0, 19, 24);
headerRow.CreateCell(0).SetCellValue("第1階段：建議征集表");
headerRow.CreateCell(12).SetCellValue("第2階段：建議答復及評比推薦表");
headerRow.CreateCell(19).SetCellValue("第3階段：建議答復反饋與實施");
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
// headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 20;
font.Boldweight = 700;
headStyle.SetFont(font);
//headStyle.WrapText = true;//自動換行
//headStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.Red.Index;
headerRow.GetCell(0).CellStyle = headStyle;
headerRow.GetCell(12).CellStyle = headStyle;
headerRow.GetCell(19).CellStyle = headStyle;

// sheet.AddMergedRegion(new Region(0, 0, 0, dtSource.Columns.Count - 1));
//headerRow.Dispose();
}
#endregion


#region 列頭及樣式
{
HSSFRow headerRow = (HSSFRow)sheet.CreateRow(1);
HSSFCellStyle headStyle = (HSSFCellStyle)workbook.CreateCellStyle();
//headStyle.Alignment = CellHorizontalAlignment.CENTER;
HSSFFont font = (HSSFFont)workbook.CreateFont();
font.FontHeightInPoints = 10;
font.Boldweight = 700;
headStyle.SetFont(font);
headStyle.WrapText = true;//自動換行
headStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//表格線
headStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
headStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
headStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
headStyle.Alignment = HorizontalAlignment.Center;//水平居中

 

//添加批注
HSSFPatriarch patr = (HSSFPatriarch)sheet.CreateDrawingPatriarch();
HSSFComment comment12 = patr.CreateComment(new HSSFClientAnchor(0, 0, 0, 0, 1, 2, 2, 3));//批注顯示定位
comment12.String = new HSSFRichTextString("請填寫完整部門名稱！");
HSSFCell cell12 = (HSSFCell)headerRow.CreateCell(12);//將批注給予單元格
cell12.CellComment = comment12;

 


foreach (DataColumn column in dtSource.Columns)
{
//設置列寬 寫死
string Names = "";
switch (column.ColumnName)
{
case "TOPICID":
Names = "序列號";
sheet.SetColumnWidth(0, 16 * 256);
break;
case "TYPE":
Names = "類型";
sheet.SetColumnWidth(1, 10 * 256);
break;
case "ZTSX":
Names = "專題屬性";
sheet.SetColumnWidth(2, 12 * 256);
break;
case "TA_TYPE":
Names = "類別";
sheet.SetColumnWidth(3, 12 * 256);
break;
case "AUTHORDEPTNAME":
Names = "部門";
sheet.SetColumnWidth(4, 10 * 256);
break;
case "AUTHORID":
Names = "崗位編碼";
sheet.SetColumnWidth(5, 10 * 256);
break;
case "AUTHOR":
Names = "提議人";
sheet.SetColumnWidth(6, 10 * 256);
break;
case "FYR_PEOPLE":
Names = "附議人";
sheet.SetColumnWidth(7, 10 * 256);
break;
case "TITLE":
Names = "主題";
sheet.SetColumnWidth(8, 18 * 256);
break;
case "MISSING":
Names = "原有缺失";
sheet.SetColumnWidth(9, 40 * 256);
break;
case "IMPROVE":
Names = "改進辦法";
sheet.SetColumnWidth(10, 40 * 256);
break;
case "RESULT":
Names = "預期效果";
sheet.SetColumnWidth(11, 28 * 256);
break;
case "ZN_DEPT":
Names = "答復部門";
sheet.SetColumnWidth(12, 10 * 256);
break;
case "DFR":
Names = "答復人";
sheet.SetColumnWidth(13, 10 * 256);
break;
case "ZXJY":
Names = "是否屬於專項建議";
sheet.SetColumnWidth(14, 10 * 256);
break;
case "SFCN":
Names = "是否采納";
sheet.SetColumnWidth(15, 10 * 256);
break;
case "DFYJ":
Names = "答復意見";
sheet.SetColumnWidth(16, 30 * 256);
break;
case "TA_YX":
Names = "是否推薦為優秀建議";
sheet.SetColumnWidth(17, 10 * 256);
break;
case "TJJX":
Names = "推薦獎項";
sheet.SetColumnWidth(18, 10 * 256);
break;
case "APPRAISAL_RESULTS":
Names = "提議人評價意見";
sheet.SetColumnWidth(19, 12 * 256);
break;
case "SSBM":
Names = "實施部門";
sheet.SetColumnWidth(20, 12 * 256);
break;
case "SSZRR":
Names = "實施責任人";
sheet.SetColumnWidth(21, 8 * 256);
break;
case "SSQK":
Names = "實施情況";
sheet.SetColumnWidth(22, 22 * 256);
break;
case "WGZT":
Names = "是否完工";
sheet.SetColumnWidth(23, 8 * 256);
break;
case "YQWGSJ":
Names = "預期完工時間";
sheet.SetColumnWidth(24, 12 * 256);
break;
}
headerRow.CreateCell(column.Ordinal).SetCellValue(Names);
headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

//采用自動列寬，根據列名字符長度
//sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
//if (arrColWidth[column.Ordinal] > 255)
//{
// arrColWidth[column.Ordinal] = 254;
//}
//else
//{
// sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
//}
}
// headerRow.Dispose();
}
#endregion

rowIndex = 2;
}
#endregion


#region 填充內容
HSSFRow dataRow = (HSSFRow)sheet.CreateRow(rowIndex);
HSSFCellStyle contextStyle = (HSSFCellStyle)workbook.CreateCellStyle();
contextStyle.WrapText = true;//自動換行
contextStyle.Alignment = HorizontalAlignment.Center;//水平居中
contextStyle.VerticalAlignment = VerticalAlignment.Center;//垂直居中
contextStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin; //表格線
contextStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
contextStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
contextStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
foreach (DataColumn column in dtSource.Columns)
{
HSSFCell newCell = (HSSFCell)dataRow.CreateCell(column.Ordinal);
dataRow.GetCell(column.Ordinal).CellStyle = contextStyle;

string drValue = row[column].ToString();

switch (column.DataType.ToString())
{
case "System.String"://字符串類型
newCell.SetCellValue(drValue);
break;
case "System.DateTime"://日期類型
System.DateTime dateV;
System.DateTime.TryParse(drValue, out dateV);
newCell.SetCellValue(dateV);

newCell.CellStyle = dateStyle;//格式化顯示
break;
case "System.Boolean"://布爾型
bool boolV = false;
bool.TryParse(drValue, out boolV);
newCell.SetCellValue(boolV);
break;
case "System.Int16"://整型
case "System.Int32":
case "System.Int64":
case "System.Byte":
int intV = 0;
int.TryParse(drValue, out intV);
newCell.SetCellValue(intV);
break;
case "System.Decimal"://浮點型
case "System.Double":
double doubV = 0;
double.TryParse(drValue, out doubV);
newCell.SetCellValue(doubV);
break;
case "System.DBNull"://空值處理
newCell.SetCellValue("");
break;
default:
newCell.SetCellValue("");
break;
}

}
#endregion

rowIndex++;
}
using (MemoryStream ms = new MemoryStream())
{
workbook.Write(ms);
ms.Flush();
ms.Position = 0;

//sheet.Dispose();
//workbook.Dispose();//一般只用寫這一個就OK了，他會遍歷並釋放所有資源，但當前版本有問題所以只釋放sheet
return ms;
}
}

/// <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);
}