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DataTable 导出Excel 之 NPOI
NPOI 强大的地方就是Excel里面90%功能，都能实现。坑爹的是需要引用5个DLL
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官方例子:
static void Main(string[] args)
{
IWorkbook workbook = new XSSFWorkbook();
ISheet worksheet = workbook.CreateSheet("Sheet1");
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for (int rownum = 0; rownum < 10000; rownum++)
{
IRow row = worksheet.CreateRow(rownum);
for (int celnum = 0; celnum < 20; celnum++)
{
ICell Cell = row.CreateCell(celnum);
Cell.SetCellValue("Cell: Row-" + rownum + ";CellNo:" + celnum);
}
}
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FileStream sw = File.Create("test.xlsx");
workbook.Write(sw);
sw.Close();
}
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自定义导出数据,设置字体,列宽,表头
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DataTable dt =//
IWorkbook workbook = new XSSFWorkbook();
ISheet worksheet = workbook.CreateSheet("fulu");
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//字体设置
IFont Font = workbook.CreateFont();
Font.FontName = "华文细黑";
ICellStyle CellStyle = workbook.CreateCellStyle();
CellStyle.SetFont(Font);
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IFont FontHead = workbook.CreateFont();
FontHead.FontName = "华文细黑";
FontHead.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.Bold;
ICellStyle CellHeadStyle = workbook.CreateCellStyle();
CellHeadStyle.SetFont(FontHead);
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#region 定义DataTable要显示的数据（如果全部显示，忽略这种方法）
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List<ExcelFormat> formatList = new List<ExcelFormat>();
int n = 0;
ExcelFormat item = new ExcelFormat();
item.ID = n;
item.ColTitle = "订单编号";
item.ColName = "OrderNo";
item.ColWidth = 20;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = ++n;
item.ColTitle = "购买时间";
item.ColName = "BuyTime";
item.ColWidth = 20;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = ++n;
item.ColTitle = "购买数量";
item.ColName = "BuyNum";
item.ColWidth = 10;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = ++n;
item.ColTitle = "订单金额";
item.ColName = "Payment";
item.ColWidth = 10;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = ++n;
item.ColTitle = "商品编号";
item.ColName = "ProductId";
item.ColWidth = 15;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = ++n;
item.ColTitle = "商品名称";
item.ColName = "ProductName";
item.ColWidth = 40;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = ++n;
item.ColTitle = "充值账号";
item.ColName = "ChargeAccount";
item.ColWidth = 20;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = n++;
item.ColTitle = "FL订单编号";
item.ColName = "FLOrderNo";
item.ColWidth = 20;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = n++;
item.ColTitle = "订单状态";
item.ColName = "OrderStatus";
item.ColWidth = 15;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = n++;
item.ColTitle = "买家地区";
item.ColName = "UserIP";
item.ColWidth = 20;
formatList.Add(item);
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item = new ExcelFormat();
item.ID = n++;
item.ColTitle = "备注";
item.ColName = "Remark";
item.ColWidth = 40;
formatList.Add(item);
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#endregion
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//设置每一列的宽度
foreach (ExcelFormat format in formatList)
{
worksheet.SetColumnWidth(format.ID, format.ColWidth * 256);
}
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//写入表头，从第行开始, 华文细黑+加粗
IRow rowhead = worksheet.CreateRow(0);
foreach (ExcelFormat format in formatList)
{
ICell Cell = rowhead.CreateCell(format.ID);
Cell.SetCellValue(format.ColTitle);
Cell.CellStyle = CellHeadStyle;
}
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//写入行，从第行开始，华文细黑
for (int rownum = 1; rownum <= dt.Rows.Count; rownum++)
{
IRow row = worksheet.CreateRow(rownum);
foreach (ExcelFormat format in formatList)
{
ICell Cell = row.CreateCell(format.ID);
Cell.SetCellValue(dt.Rows[rownum - 1][format.ColName].ToString());
Cell.CellStyle = CellStyle;
}
}
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//保存到Excel
string filename = string.Format("fulu{0}.xlsx", DateTime.Now.ToLongDateString());
FileStream sw = File.Create(filename);
workbook.Write(sw);
sw.Close();
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MessageBox.Show("导出成功");
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class ExcelFormat
{
public int ID { get; set; }
public string ColTitle { get; set; }
public string ColName { get; set; }
public int ColWidth { get; set; }
}
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原文地址：http://www.cnblogs.com/top15from/p/4187329.html
