Npoi List DataTable导出一个Excel多个sheet 下载

public class UserInfo
{
public string Name { get; set; }
public string Id { get; set; }
public string Phone { get; set; }
}

/// <summary>
/// 生成excel文件到内存中
/// </summary>
/// <returns></returns>
public void CreateExcel()
{
MemoryStream ms = new MemoryStream();

List<UserInfo> listUser = new List<UserInfo>()
{
new UserInfo { Name="1", Id="1", Phone="1r" },
new UserInfo { Name="2", Id="2", Phone="2r" },
new UserInfo { Name="3", Id="3", Phone="3r" },
new UserInfo { Name="4", Id="4", Phone="4r" },
new UserInfo { Name="5", Id="5", Phone="5r" },
};

//创建工作簿对象
var workbook = new HSSFWorkbook();

#region DataTable数据
//创建工作表
ISheet sheet = workbook.CreateSheet("一个sheet");
IRow row0 = sheet.CreateRow(0);
row0.CreateCell(0).SetCellValue("用户Id");
row0.CreateCell(1).SetCellValue("用户名称");
row0.CreateCell(2).SetCellValue("用户备注信息");

var dtSource = GetDataTable();
for (int i = 0; i < dtSource.Rows.Count; i++)
{
row0 = sheet.CreateRow(i + 1);
for (int j = 0; j < dtSource.Columns.Count; j++)
{
row0.CreateCell(j).SetCellValue(dtSource.Rows[i][j].ToString());
}
}

#endregion

#region list数据
ISheet sheet2 = workbook.CreateSheet("另一个sheet");
IRow row2 = sheet2.CreateRow(0);
row2.CreateCell(0).SetCellValue("用户Id2");
row2.CreateCell(1).SetCellValue("用户名称2");
row2.CreateCell(2).SetCellValue("用户备注信息2");

for (int r = 1; r < listUser.Count; r++)
{
//创建行row
IRow row = sheet2.CreateRow(r);
row.CreateCell(0).SetCellValue(listUser[r].Id);
row.CreateCell(1).SetCellValue(listUser[r].Name);
row.CreateCell(2).SetCellValue(listUser[r].Phone);
}

#endregion

workbook.Write(ms);

ms.Flush();
ms.Position = 0;

var fileName = "测试Excel" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";//xls
DownloadExcel(ms, fileName);

}

/// <summary>
/// 生成http流下载文件
/// </summary>
/// <param name="ms"></param>
/// <param name="fileName"></param>
private static void DownloadExcel(MemoryStream ms, string fileName)
{
#region 处理IE、火狐等浏览器文件名乱码
if (System.Web.HttpContext.Current.Request.ServerVariables["http_user_agent"].IndexOf("Firefox", StringComparison.Ordinal) != -1)
{
fileName = "=?UTF-8?B?" + Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(fileName)) + "?=";
}
else
{
fileName = System.Web.HttpUtility.UrlEncode(fileName, System.Text.Encoding.UTF8);
fileName = fileName.Replace("+", "%20");
}
#endregion
System.Web.HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;fileName=" + fileName);
System.Web.HttpContext.Current.Response.AddHeader("Content-Length", ms.Length.ToString());
System.Web.HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");
System.Web.HttpContext.Current.Response.ContentType = "application/octet-stream;charset=utf-8";
System.Web.HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF8;
System.Web.HttpContext.Current.Response.BinaryWrite(ms.ToArray());
}

/// <summary>
/// 模拟DataTable
/// </summary>
/// <returns></returns>
public DataTable GetDataTable()
{
DataTable tblDatas = new DataTable("Datas");
DataColumn dc = null;

dc = tblDatas.Columns.Add("Name", Type.GetType("System.String"));
dc = tblDatas.Columns.Add("Id", Type.GetType("System.String"));
dc = tblDatas.Columns.Add("Phone", Type.GetType("System.String"));

DataRow newRow;
newRow = tblDatas.NewRow();
newRow["Name"] = "大话西游";
newRow["Id"] = "2.0";
newRow["Phone"] = "我很喜欢";
tblDatas.Rows.Add(newRow);

newRow = tblDatas.NewRow();
newRow["Name"] = "梦幻西游";
newRow["Id"] = "3.0";
newRow["Phone"] = "比大话更幼稚";
tblDatas.Rows.Add(newRow);

return tblDatas;
}