最近开发的一个项目中，需要数据导出到Excel ，使用了微软自带的库 Microsoft.Office.Interop.Excel 写了一个方法，完成后发现导出数据几十条的情况下速度都很慢，需要等待好几秒钟才能完成！
然后去网上翻阅了下资料，发现 NPOI 这个开源的 Excel 类库口碑还不错，这次拿来初步学习和使用了下，学习成本也不高，也相当好用，几百条数据秒操作完成！攒一个！
随笔记录下这次代码，供小伙伴和自己以后参考！（本人比较懒，没怎么特别整理，大家讲究着看！）
#region 使用 NPOI 方法
string fileName = "";
#region /*保存对话框*/
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "导出Excel(*.xls)|*.xls";
sfd.FileName = "车贷客户筛选资料 - " + DateTime.Now.ToString("yyyyMMddHHmmss");
if (sfd.ShowDialog() == DialogResult.OK)
{
short lineheight_header = 400; //标题列行高
short lineheight_content = 300; //记录行行高
short fontsize_header = 12; //标题字体大小
short fontsize_content = 11;//记录字体大小
fileName = sfd.FileName;
/* xls */
IWorkbook book = new HSSFWorkbook();
/* xlsx */
//IWorkbook book = new XSSFWorkbook();
#region 定义样式
// 列名 样式
ICellStyle style_ColumnName = book.CreateCellStyle();
style_ColumnName.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//文字水平对齐方式
style_ColumnName.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
//style_ColumnName.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//设置边框
//style_ColumnName.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
//style_ColumnName.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
//style_ColumnName.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
IFont font_ColumnName = book.CreateFont();//字体
font_ColumnName.FontName = "宋体";
font_ColumnName.FontHeightInPoints = fontsize_header;
font_ColumnName.Boldweight = (short)FontBoldWeight.Bold;//字体加粗样式
font_ColumnName.Color = HSSFColor.Black.Index;//字体颜色
style_ColumnName.SetFont(font_ColumnName);
IFont font_contentText = book.CreateFont();//字体
font_contentText.FontName = "宋体";
font_contentText.FontHeightInPoints = fontsize_content;
/* Content - text - Left*/
ICellStyle style_contentText_Left = book.CreateCellStyle();
style_contentText_Left.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Left;//文字水平对齐方式
style_contentText_Left.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
//style_contentText_Left.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//设置边框
//style_contentText_Left.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
//style_contentText_Left.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
//style_contentText_Left.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
style_contentText_Left.SetFont(font_contentText);
/* Content - text - Center */
ICellStyle style_contentText_Center = book.CreateCellStyle();
style_contentText_Center.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//文字水平对齐方式
style_contentText_Center.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
//style_contentText_Center.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//设置边框
//style_contentText_Center.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
//style_contentText_Center.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
//style_contentText_Center.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
style_contentText_Center.SetFont(font_contentText);
/* Content - DateTime */
ICellStyle style_date = book.CreateCellStyle();
style_date.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;//文字水平对齐方式
style_date.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
//style_date.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//设置边框
//style_date.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
//style_date.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
//style_date.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
IFont font_date = book.CreateFont();//字体
font_date.FontName = "宋体";
font_date.FontHeightInPoints = fontsize_content;
style_date.SetFont(font_date);
IDataFormat dataFormatCustom = book.CreateDataFormat(); //定义数据格式
style_date.DataFormat = dataFormatCustom.GetFormat("yyyy-MM-dd");
/* Content - numeric */
ICellStyle style_numeric = book.CreateCellStyle();
style_numeric.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Right;//文字水平对齐方式
style_numeric.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;//文字垂直对齐方式
//style_numeric.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//设置边框
//style_numeric.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
//style_numeric.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
//style_numeric.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
IFont font_numeric = book.CreateFont();//字体
font_numeric.FontName = "宋体";
font_numeric.FontHeightInPoints = fontsize_content;
style_numeric.SetFont(font_date);
IDataFormat numericFormatCustom = book.CreateDataFormat(); //定义数据格式
style_numeric.DataFormat = numericFormatCustom.GetFormat("0.00");
#endregion
#region 创建表单
/* 创建一个表单 */
ISheet sheet = book.CreateSheet("Sheet0");
#region 第一行 标题列
IRow row_head1 = sheet.CreateRow(0); //建立行，参数为行号，从0计
row_head1.Height = lineheight_header;
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, 4));
ICell row0cell0 = row_head1.CreateCell(0); //档案信息
row0cell0.SetCellValue("档案信息");
row0cell0.CellStyle = style_ColumnName;
sheet.AddMergedRegion(new CellRangeAddress(0, 0, 5, 12));
ICell row0cell1 = row_head1.CreateCell(5); //借款人
row0cell1.SetCellValue("借款人");
row0cell1.CellStyle = style_ColumnName;
#endregion
#region 第二行 标题列
IRow row_head2 = sheet.CreateRow(1); //建立行，参数为行号，从0计
row_head2.Height = lineheight_header;
/* 档案信息 */
ICell row1cell_0 = row_head2.CreateCell(0); //客户编号
row1cell_0.SetCellValue("客户编号");
row1cell_0.CellStyle = style_ColumnName;
sheet.SetColumnWidth(0, 15 * 256);
ICell row1cell_1 = row_head2.CreateCell(1); //合同号
row1cell_1.SetCellValue("合同号");
row1cell_1.CellStyle = style_ColumnName;
sheet.SetColumnWidth(1, 30 * 256);
ICell row1cell_2 = row_head2.CreateCell(2); //调查员
row1cell_2.SetCellValue("调查员");
row1cell_2.CellStyle = style_ColumnName;
sheet.SetColumnWidth(2, 10 * 256);
ICell row1cell_3 = row_head2.CreateCell(3); //客户状态
row1cell_3.SetCellValue("客户状态");
row1cell_3.CellStyle = style_ColumnName;
sheet.SetColumnWidth(3, 10 * 256);
ICell row1cell_4 = row_head2.CreateCell(4); //备注
row1cell_4.SetCellValue("备注");
row1cell_4.CellStyle = style_ColumnName;
sheet.SetColumnWidth(4, 25 * 256);
/* 借款人 */
ICell row1cell_5 = row_head2.CreateCell(5); //姓名
row1cell_5.SetCellValue("姓名");
row1cell_5.CellStyle = style_ColumnName;
sheet.SetColumnWidth(5, 15 * 256);
ICell row1cell_6 = row_head2.CreateCell(6); //身份证号
row1cell_6.SetCellValue("身份证号");
row1cell_6.CellStyle = style_ColumnName;
sheet.SetColumnWidth(6, 25 * 256);
ICell row1cell_7 = row_head2.CreateCell(7); //手机
row1cell_7.SetCellValue("手机");
row1cell_7.CellStyle = style_ColumnName;
sheet.SetColumnWidth(7, 15 * 256);
ICell row1cell_8 = row_head2.CreateCell(8); //企业单位
row1cell_8.SetCellValue("企业单位");
row1cell_8.CellStyle = style_ColumnName;
sheet.SetColumnWidth(8, 30 * 256);
ICell row1cell_9 = row_head2.CreateCell(9); //企业地址
row1cell_9.SetCellValue("企业地址");
row1cell_9.CellStyle = style_ColumnName;
sheet.SetColumnWidth(9, 30 * 256);
ICell row1cell_10 = row_head2.CreateCell(10); //企业电话
row1cell_10.SetCellValue("企业电话");
row1cell_10.CellStyle = style_ColumnName;
sheet.SetColumnWidth(10, 15 * 256);
ICell row1cell_11 = row_head2.CreateCell(11); //住宅地址
row1cell_11.SetCellValue("住宅地址");
row1cell_11.CellStyle = style_ColumnName;
sheet.SetColumnWidth(11, 30 * 256);
ICell row1cell_12 = row_head2.CreateCell(12); //住宅电话
row1cell_12.SetCellValue("住宅电话");
row1cell_12.CellStyle = style_ColumnName;
sheet.SetColumnWidth(12, 15 * 256);
#endregion
#region 冻结 标题两行
sheet.CreateFreezePane(0, 2, 0, 2);
#endregion
#region 数据行
int rowindex = 2;
foreach (CarCustomer cc in customers)
{
IRow datarow = sheet.CreateRow(rowindex);
datarow.Height = lineheight_content;
ICell datacell_0 = datarow.CreateCell(0); //客户编号
datacell_0.SetCellValue(cc.customerid);
datacell_0.CellStyle = style_contentText_Center;
ICell datacell_1 = datarow.CreateCell(1); //合同号
datacell_1.SetCellValue(cc.bankcompactid);
datacell_1.CellStyle = style_contentText_Center;
ICell datacell_2 = datarow.CreateCell(2); //调查员
datacell_2.SetCellValue(cc.investigator.name);
datacell_2.CellStyle = style_contentText_Center;
ICell datacell_3 = datarow.CreateCell(3); //客户状态
datacell_3.SetCellValue(cc.customerstate.name);
datacell_3.CellStyle = style_contentText_Center;
ICell datacell_4 = datarow.CreateCell(4); //备注
datacell_4.SetCellValue(cc.remark);
datacell_4.CellStyle = style_contentText_Left;
/* 借款人 */
ICell datacell_5 = datarow.CreateCell(5); //姓名
datacell_5.SetCellValue(cc.customername);
datacell_5.CellStyle = style_contentText_Center;
ICell datacell_6 = datarow.CreateCell(6); //身份证号
datacell_6.SetCellValue(cc.identitycard);
datacell_6.CellStyle = style_contentText_Center;
ICell datacell_7 = datarow.CreateCell(7); //手机
datacell_7.SetCellValue(cc.phone);
datacell_7.CellStyle = style_contentText_Center;
ICell datacell_8 = datarow.CreateCell(8); //企业单位
datacell_8.SetCellValue(cc.job);
datacell_8.CellStyle = style_contentText_Left;
ICell datacell_9 = datarow.CreateCell(9); //企业地址
datacell_9.SetCellValue(cc.workaddress);
datacell_9.CellStyle = style_contentText_Left;
ICell datacell_10 = datarow.CreateCell(10); //企业电话
datacell_10.SetCellValue(cc.worktel);
datacell_10.CellStyle = style_contentText_Center;
ICell datacell_11 = datarow.CreateCell(11); //住宅地址
datacell_11.SetCellValue(cc.homeaddress);
datacell_11.CellStyle = style_contentText_Left;
ICell datacell_12 = datarow.CreateCell(12); //住宅电话
datacell_12.SetCellValue(cc.homephone);
datacell_12.CellStyle = style_contentText_Center;
rowindex += 1;
}
#endregion
#region 导入 Excel
// 转为字节数组
MemoryStream stream = new MemoryStream();
book.Write(stream);
var buf = stream.ToArray();
//保存为Excel文件
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
fs.Write(buf, 0, buf.Length);
fs.Flush();
MessageBox.Show("导出 EXECL 成功！");
}
#endregion
#endregion
}
#endregion