NPOI导出Excel的网上有很多，正好自己遇到就学习并总结了一下：

首先说明几点：

1.Excel2003及一下：后缀xls，单个sheet最大行数为65335

Excel2007 单个sheet ：后缀xlsx 单个sheet 最大行数为 1048576

2.在用NPOI.dll时，导出的excel两种形式（xls，xlsx）用到的组件不一样，xls是HSSF,xlsx是XSSF,

由于某种原因我选择的是HSSF组件的：
以linq 匿名类得到数据为数据源导出Excel
类如以这样为数据源的：

var buildingCustomsPass = from CityBuilding in cityBuilding
select new
{

MapBuildingModelID = 0,
MapModelID = 0,
BuildingModelID = CityBuilding.BuildingModelID,
BuildingLevel = CityBuilding.BuildingLevel,
UnitPosX = CityBuilding.UnitPosX,
UnitPosY = CityBuilding.UnitPosY,
GarrisonIndex = 0,
BuildingUID = CityBuilding.BuildingUID
};

做的时候利用的是NPOI.dll这个开源项目，当然要引入NPOI.dll（自己网上搜，很多，这里就不提供了）

一：Excel导出单个sheet

//创建一个有Excel（构造的大概框架，标题）
public HSSFWorkbook CreateExcel(string[] titles)
{
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = (HSSFSheet)workbook.CreateSheet();

//标题样式
ICellStyle cellStyleLable = sheet.Workbook.CreateCellStyle();
cellStyleLable.Alignment = HorizontalAlignment.CENTER;
cellStyleLable.VerticalAlignment = VerticalAlignment.CENTER;
cellStyleLable.FillPattern = FillPatternType.SOLID_FOREGROUND;
cellStyleLable.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.WHITE.index;
//设置字体
IFont font = workbook.CreateFont();
font.Boldweight = (short)FontBoldWeight.BOLD;
cellStyleLable.SetFont(font);

//文本样式
 //ICellStyle cellStyleText = sheet.Workbook.CreateCellStyle();
 //cellStyleText.Alignment = HorizontalAlignment.CENTER;
 //cellStyleText.VerticalAlignment = VerticalAlignment.CENTER;
 //cellStyleText.BorderBottom = BorderStyle.THIN;
 //cellStyleText.BorderTop = BorderStyle.THIN;
 //cellStyleText.BorderRight = BorderStyle.THIN;
 //cellStyleText.BorderLeft = BorderStyle.THIN;

IRow row = sheet.CreateRow(0);
 for (int i = 0; i < titles.Length; i++)
{
ICell cell = row.CreateCell(i);
cell.CellStyle = cellStyleLable;
cell.SetCellValue(titles[i]);

sheet.SetColumnWidth(i, 20 * 256);

}
 return workbook;
}

//导出

protected void ButtonExport_Click(object sender, EventArgs e){

这里是以linq得到的匿名类为数据源

var buildingCustomsPass = from CityBuilding in cityBuilding
select new
{

MapBuildingModelID = 0,
MapModelID = 0,
BuildingModelID = CityBuilding.BuildingModelID,
BuildingLevel = CityBuilding.BuildingLevel,
UnitPosX = CityBuilding.UnitPosX,
UnitPosY = CityBuilding.UnitPosY,
GarrisonIndex = 0,
BuildingUID = CityBuilding.BuildingUID
};
if (buildingCustomsPass.Count() > 0)
{
HSSFWorkbook workbook = CreateExcel(new string[] { "MapBuildingModelID", "MapModelID", "BuildingModelID", "BuildingLevel", "UnitPosX", "UnitPosY", "GarrisonIndex" });

int i = 0;

foreach (var building in buildingCustomsPass)
{
 IRow row = workbook.GetSheetAt(0).CreateRow(i + 1);
 row.CreateCell(0).SetCellValue(building.MapBuildingModelID);
 row.CreateCell(1).SetCellValue(building.MapModelID);
row.CreateCell(2).SetCellValue(building.BuildingModelID);
row.CreateCell(3).SetCellValue(building.BuildingLevel);
row.CreateCell(4).SetCellValue(building.UnitPosX);
row.CreateCell(5).SetCellValue(building.UnitPosY);
row.CreateCell(6).SetCellValue(building.GarrisonIndex);
 i = i + 1;

}

MemoryStream ms = new MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();

}

二.Excel 多个sheet（这里是数据超过65335时写入另一个sheet）

/// <summary>
/// 生成Excel表头(这里只是生成表头)
/// </summary>
/// <param name="sheet"></param>
/// <param name="titles"></param>
public void CreateHeader(HSSFSheet sheet, string[] titles)
{
//标题样式
ICellStyle cellStyleLable = sheet.Workbook.CreateCellStyle();
cellStyleLable.Alignment = HorizontalAlignment.CENTER;
cellStyleLable.VerticalAlignment = VerticalAlignment.CENTER;
cellStyleLable.FillPattern = FillPatternType.SOLID_FOREGROUND;
cellStyleLable.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.WHITE.index;
IRow row = sheet.CreateRow(0);
for (int i = 0; i < titles.Length; i++)
{
ICell cell = row.CreateCell(i);
cell.CellStyle = cellStyleLable;
cell.SetCellValue(titles[i]);
sheet.SetColumnWidth(i, 20 * 256);
}
}

//导出

protected void ButtonExporet_Click(object sender, EventArgs e){

NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();

var customFighter = from
CityFighter in cityFighter
select new { CustomFighterSetID =0,
CustomModelID = 0,
FighterModelID = CityFighter.FighterModelID,
FighterLevel = CityFighter.FighterLevel,
IsForeignAid = 0,
BonusRatePer =0 };
if (customFighter.Count() > 0)
{
int rowCount = 0;
int sheetCount = 1;
//添加一个sheet
NPOI.SS.UserModel.ISheet newSheet = null;
newSheet = book.CreateSheet("Sheet" + sheetCount);

CreateHeader((HSSFSheet)newSheet, new string[] { "CustomFighterSetID", "CustomModelID", "FighterModelID", "FighterLevel", "IsForeignAid", "BonusRatePer" });
foreach (var fighter in customFighter)
{
rowCount++;
if (rowCount == 65335)
{
rowCount = 1;
sheetCount++;
newSheet = book.CreateSheet("Sheet" + sheetCount);
CreateHeader((HSSFSheet)newSheet, new string[] { "CustomFighterSetID", "CustomModelID", "FighterModelID", "FighterLevel", "IsForeignAid", "BonusRatePer" });
}
// IRow row = book.GetSheetAt(sheetCount).CreateRow(rowCount + 1);
IRow row = newSheet.CreateRow(rowCount);
row.CreateCell(0).SetCellValue(fighter.CustomFighterSetID);
row.CreateCell(1).SetCellValue(fighter.CustomModelID);
row.CreateCell(2).SetCellValue(fighter.FighterModelID);
row.CreateCell(3).SetCellValue(fighter.FighterLevel);
row.CreateCell(4).SetCellValue(fighter.IsForeignAid);
row.CreateCell(5).SetCellValue(fighter.BonusRatePer);
}
MemoryStream ms = new MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();

}

三.Excel下的重新的sheet（类似2）

/// <summary>
/// 生成Excel头
/// </summary>
/// <param name="sheet"></param>
/// <param name="titles"></param>
public void CreateHeader(HSSFSheet sheet, string[] titles)
{
//标题样式
ICellStyle cellStyleLable = sheet.Workbook.CreateCellStyle();
cellStyleLable.Alignment = HorizontalAlignment.CENTER;
cellStyleLable.VerticalAlignment = VerticalAlignment.CENTER;
cellStyleLable.FillPattern = FillPatternType.SOLID_FOREGROUND;
cellStyleLable.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
cellStyleLable.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.WHITE.index;
IRow row = sheet.CreateRow(0);
for (int i = 0; i < titles.Length; i++)
{
ICell cell = row.CreateCell(i);
cell.CellStyle = cellStyleLable;
cell.SetCellValue(titles[i]);
sheet.SetColumnWidth(i, 20 * 256);
}
}

//开始导出 这里是导出一个Excel里面有来自三个数据源生成三个sheet

protected void ButtonSearch_export(object sender, EventArgs e)

{

if (playerInfo != null)
{
DBContext dbContext = DBHelper.GetGameDBContext(iServerId);
using (ISession session = dbContext.OpenSession())
{
NPOI.HSSF.UserModel.HSSFWorkbook book = new NPOI.HSSF.UserModel.HSSFWorkbook();
//sheet
NPOI.SS.UserModel.ISheet newSheet = null;
PlayerCity[] playerCity = session.CreateCriteria(typeof(PlayerCity)).Add(Restrictions.Eq("PlayerUID", playerInfo.PlayerUID)).List<PlayerCity>().ToArray();
ICollection<CityBuilding> cityBuilding = session.CreateCriteria(typeof(CityBuilding)).Add(Restrictions.Eq("CityUID", playerCity[0].CityUID)).List<CityBuilding>().ToArray();
var buildingCustomsPass = from CityBuilding in cityBuilding
select new
{
MapBuildingModelID = 0,
MapModelID = 0,
BuildingModelID = CityBuilding.BuildingModelID,
BuildingLevel = CityBuilding.BuildingLevel,
UnitPosX = CityBuilding.UnitPosX,
UnitPosY = CityBuilding.UnitPosY,
GarrisonIndex = 0,
BuildingUID = CityBuilding.BuildingUID
};
if (buildingCustomsPass.Count() > 0)
{
int rowCount = 0;
newSheet = book.CreateSheet("建筑");
CreateHeader((HSSFSheet)newSheet, new string[] { "MapBuildingModelID", "MapModelID", "BuildingModelID", "BuildingLevel", "UnitPosX", "UnitPosY", "GarrisonIndex", "BuildingUID" });
foreach (var building in buildingCustomsPass)
{
rowCount++;
IRow row = newSheet.CreateRow(rowCount);
row.CreateCell(0).SetCellValue(building.MapBuildingModelID);
row.CreateCell(1).SetCellValue(building.MapModelID);
row.CreateCell(2).SetCellValue(building.BuildingModelID);
row.CreateCell(3).SetCellValue(building.BuildingLevel);
row.CreateCell(4).SetCellValue(building.UnitPosX);
row.CreateCell(5).SetCellValue(building.UnitPosY);
row.CreateCell(6).SetCellValue(building.GarrisonIndex);
row.CreateCell(7).SetCellValue(building.BuildingUID.ToString());

}
newSheet = null;
}
//英雄
Guid guid = new Guid("00000000-0000-0000-0000-000000000000");
ICollection<CityWarrior> cityWarrior = session.CreateCriteria(typeof(CityWarrior)).Add(Restrictions.Eq("CityUID", playerCity[0].CityUID)).Add(Restrictions.Not(Restrictions.Eq("BuildingUID", guid))).List<CityWarrior>().ToArray();
var customWarrior = from CityWarrior in cityWarrior
select new
{
CustomWarriorSetID = 0,
CustomModelID = 0,
WarriorModelID = CityWarrior.WarriorModelID,
Rank = CityWarrior.Rank,
FighterLevel = CityWarrior.FighterLevel,
Coordination = CityWarrior.Coordination,
Formation_STR = CityWarrior.Formation_STR,
SpellsLevelSet_STR = CityWarrior.SpellsLevelSet_STR,
EquimentSpellsSlot = CityWarrior.EquimentSpellsSlot,
AstrolabeSlotState_STR = CityWarrior.AstrolabeSlotState_STR,
DetachTime = 0,
UnitPosX = 0,
UnitPosY = 0,
Direction = 0,
GarrisonIndex = 0,
IsForeignAid = 0,
HitRate = 0,
BonusRatePer = 0,
HitPointBonusRatePer = 0,
DamageBonusRatePer = 0,
DefenseBonusRatePer = 0
};
if (customWarrior.Count() > 0)
{
int rowCount = 0;
newSheet = book.CreateSheet("英雄");
CreateHeader((HSSFSheet)newSheet, new string[] { "CustomWarriorSetID", " CustomModelID", "WarriorModelID", "Rank", "FighterLevel", "Coordination", "Formation_STR", "SpellsLevelSet_STR", "EquimentSpellsSlot ", "AstrolabeSlotState_STR", "DetachTime", "UnitPosX", "UnitPosY", "Direction", "GarrisonIndex", "IsForeignAid", "HitRate", "BonusRatePer", "HitPointBonusRatePer", "DamageBonusRatePer", "DefenseBonusRatePer" });
foreach (var warrior in customWarrior)
{
rowCount++;
IRow row = newSheet.CreateRow(rowCount);
row.CreateCell(0).SetCellValue(warrior.CustomWarriorSetID);
row.CreateCell(1).SetCellValue(warrior.CustomModelID);
row.CreateCell(2).SetCellValue(warrior.WarriorModelID);
row.CreateCell(3).SetCellValue(warrior.Rank.ToString());
row.CreateCell(4).SetCellValue(warrior.FighterLevel);
row.CreateCell(5).SetCellValue(warrior.Coordination.ToString());
row.CreateCell(6).SetCellValue(warrior.Formation_STR);
row.CreateCell(7).SetCellValue(warrior.SpellsLevelSet_STR);
row.CreateCell(8).SetCellValue(warrior.EquimentSpellsSlot);
row.CreateCell(9).SetCellValue(warrior.AstrolabeSlotState_STR);
row.CreateCell(10).SetCellValue(warrior.DetachTime);
row.CreateCell(11).SetCellValue(warrior.UnitPosX);
row.CreateCell(12).SetCellValue(warrior.UnitPosY);
row.CreateCell(13).SetCellValue(warrior.Direction.ToString());
row.CreateCell(14).SetCellValue(warrior.GarrisonIndex);
row.CreateCell(15).SetCellValue(warrior.IsForeignAid);
row.CreateCell(16).SetCellValue(warrior.HitRate);
row.CreateCell(17).SetCellValue(warrior.BonusRatePer);
row.CreateCell(18).SetCellValue(warrior.HitPointBonusRatePer);
row.CreateCell(19).SetCellValue(warrior.DamageBonusRatePer);
row.CreateCell(20).SetCellValue(warrior.DefenseBonusRatePer);
}
newSheet = null;
}
ICollection<CityFighter> cityFighter = session.CreateCriteria(typeof(CityFighter)).Add(Restrictions.Eq("CityUID", playerCity[0].CityUID)).List<CityFighter>().ToArray();
var customFighter = from
CityFighter in cityFighter
select new
{
CustomFighterSetID = 0,
CustomModelID = 0,
FighterModelID = CityFighter.FighterModelID,
FighterLevel = CityFighter.FighterLevel,
IsForeignAid = 0,
BonusRatePer = 0
};
if (customFighter.Count() > 0)
{
int rowCount = 0;
newSheet = book.CreateSheet("部队");
CreateHeader((HSSFSheet)newSheet, new string[] { "CustomFighterSetID", "CustomModelID", "FighterModelID", "FighterLevel", "IsForeignAid", "BonusRatePer" });
foreach (var fighter in customFighter)
{
rowCount++;
IRow row = newSheet.CreateRow(rowCount);
row.CreateCell(0).SetCellValue(fighter.CustomFighterSetID);
row.CreateCell(1).SetCellValue(fighter.CustomModelID);
row.CreateCell(2).SetCellValue(fighter.FighterModelID);
row.CreateCell(3).SetCellValue(fighter.FighterLevel);
row.CreateCell(4).SetCellValue(fighter.IsForeignAid);
row.CreateCell(5).SetCellValue(fighter.BonusRatePer);
}
newSheet = null;
}
MemoryStream ms = new MemoryStream();
book.Write(ms);
Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}.xls", DateTime.Now.ToString("yyyyMMddHHmmssfff")));
Response.BinaryWrite(ms.ToArray());
book = null;
ms.Close();
ms.Dispose();
}
}
else
{
LabelError.Text = "该玩家不存在";
return;
}

}

用到了就整理了一下，table数据源导出，类似上面，只是循环出table中的数据

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