NPOI导入导出Excel (2)

简单演示一下创建一个Workbook对象，添加一个工作表，在工作表中添加一行一列：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.IO;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using System.Data;
using System.Data.SqlClient;

public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
MemoryStream ms = RenderToExcel(GetTable());
string fileName = @"c:\2.xls";
SaveToFile(ms, fileName);
Response.Write("成功");
}
public MemoryStream RenderToExcel(DataTable table)
{
MemoryStream ms = new MemoryStream();

using (table)
{
IWorkbook workbook = new HSSFWorkbook();

ISheet sheet = workbook.CreateSheet();

IRow headerRow = sheet.CreateRow(0);

// handling header.
foreach (DataColumn column in table.Columns)
headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption);//If Caption not set, returns the ColumnName value

// handling value.
int rowIndex = 1;

foreach (DataRow row in table.Rows)
{
IRow dataRow = sheet.CreateRow(rowIndex);

foreach (DataColumn column in table.Columns)
{
dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
}

rowIndex++;
}

workbook.Write(ms);
ms.Flush();
ms.Position = 0;
}


return ms;
}
private void SaveToFile(MemoryStream ms, string fileName)
{
using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
{
byte[] data = ms.ToArray();

fs.Write(data, 0, data.Length);
fs.Flush();

data = null;
}
}
private DataTable GetTable()
{
SqlHelperXhf xhf = new SqlHelperXhf();
string sql = "select calling_no '电话号码',starttime '时间' ,hname '楼盘名称' from [fc_freetel] a where hname<>'无'and a.id = (select min(id) from fc_freetel where calling_no=a.calling_no) order by hname,starttime desc";

return xhf.ExecuteDataTable(sql);

}
private DataTable GetTable(int hid)
{
SqlHelperXhf xhf = new SqlHelperXhf();
string sql = "select calling_no '电话号码',starttime '时间' ,hname '楼盘名称' from [fc_freetel] a where hid=@hid and a.id = (select min(id) from fc_freetel where calling_no=a.calling_no) order by hname,starttime desc";
SqlParameter paramer = new SqlParameter("@hid", hid);
return xhf.ExecuteDataTable(sql,paramer);

}
private DataTable GetTable(int hid1,int hid2,int hid3)
{
SqlHelperXhf xhf = new SqlHelperXhf();
string sql = "select calling_no '电话号码',starttime '时间' ,hname '楼盘名称' from [fc_freetel] a where hid=@hid1 or hid=@hid2 or hid=@hid3 and a.id = (select min(id) from fc_freetel where calling_no=a.calling_no) order by hname,starttime desc";
SqlParameter [] paramers =
{
new SqlParameter("@hid1", hid1),
new SqlParameter("@hid2", hid2),
new SqlParameter("@hid3", hid3)
};
return xhf.ExecuteDataTable(sql, paramers);

}
}

 

简单演示一下创建一个Workbook对象，添加一个工作表，在工作表中添加一行一列：

using NPOI.HSSF.UserModel;

using  NPOI.SS.UserModel;

public  class  NPOIWrite
{
    void  CreateSheet()
    {
        IWorkbook workbook = new  HSSFWorkbook(); //创建Workbook对象
        ISheet sheet = workbook.CreateSheet( "Sheet1" ); //创建工作表
        IRow row = sheet.CreateRow(0); //在工作表中添加一行
        ICell cell = row.CreateCell(0); //在行中添加一列
        cell.SetCellValue( "test" ); //设置列的内容
    }
}
相应的读取代码：

using  System.IO;

using  NPOI.HSSF.UserModel;
using  NPOI.SS.UserModel;

public  class  NPOIRead
{
    void  GetSheet(Stream stream)
    {
        IWorkbook workbook = new  HSSFWorkbook(stream); //从流内容创建Workbook对象
        ISheet sheet = workbook.GetSheetAt(0); //获取第一个工作表
        IRow row = sheet.GetRow(0); //获取工作表第一行
        ICell cell = row.GetCell(0); //获取行的第一列
        string  value = cell.ToString(); //获取列的值
    }
}

使用NPOI导出

从DataTable读取内容来创建Workbook对象：

public static MemoryStream RenderToExcel(DataTable table)

{
    MemoryStream ms = new  MemoryStream();

    using  (table)
    {
        using  (IWorkbook workbook = new  HSSFWorkbook())
        {
            using  (ISheet sheet = workbook.CreateSheet())
            {
                IRow headerRow = sheet.CreateRow(0);

                // handling header.
                foreach  (DataColumn column in  table.Columns)
                    headerRow.CreateCell(column.Ordinal).SetCellValue(column.Caption); //If Caption not set, returns the ColumnName value

                // handling value.
                int  rowIndex = 1;

                foreach  (DataRow row in  table.Rows)
                {
                    IRow dataRow = sheet.CreateRow(rowIndex);

                    foreach  (DataColumn column in  table.Columns)
                    {
                        dataRow.CreateCell(column.Ordinal).SetCellValue(row[column].ToString());
                    }

                    rowIndex++;
                }

                workbook.Write(ms);
                ms.Flush();
                ms.Position = 0;
            }
        }
    }
    return  ms;
}