NPOI导出为Excel文件

1.添加引用

2.将ExcelRender.cs和SqlHelper.cs两个类拷贝到App_Code文件夹下

3.写后台代码

　　eg:根据部门和日期导出成绩表

 /// <summary>
     /// 点击导出Excel
     /// </summary>
     /// <param name="sender"></param>
     /// <param name="e"></param>
     protected void Button1_Click(object sender, EventArgs e)
     {
         if (txtStart.Text != "" && TextBox2.Text != "")
         {
             DataTable table = new DataTable();
             table.Columns.Add("工号", typeof(string));
             table.Columns.Add("姓名", typeof(string));
             table.Columns.Add("分数", typeof(string));
             table.Columns.Add("考试时间", typeof(string));
             table.Columns.Add("科目", typeof(string));

             List<Score> list = new List<Score>();
             //按时间导出
             DateTime d1 = Convert.ToDateTime(txtStart.Text);
             DateTime d2 = Convert.ToDateTime(TextBox2.Text);
             //按部门导出
             var qStu = _Context.Student.Where(p => p.SBranch.ToString() == TreeView1.SelectedValue);
             if (qStu.Count() > )
             {
                 for (int i = ; i < qStu.Count(); i++)
                 {
                     var qSc = _Context.Score.Where(p=>p.SNum == qStu.ToList()[i].SNum);
                     if (qSc.Count() > )
                     {
                         foreach (Score sc in qSc)
                         {
                             list.Add(sc);
                         }
                     }
                 }
             }

             List<Score> result = new List<Score>();
             var q = _Context.Score.Where(p => p.DateExam >= d1 && p.DateExam <= d2);
             if (q.Count() > )
             {
                 if (TreeView1.SelectedValue == null || TreeView1.SelectedValue == "")
                 {
                     result = q.ToList();
                 }
                 else
                 {
                     //考试时间与部门的交集
                     result = list.Intersect(q.ToList()).ToList();
                 }
                 for (int i = ; i < result.Count; i++)
                 {
                     string a = result[i].SNum;
                     //Thread.Sleep(1);
                     string b = result[i].SName;
                     //Thread.Sleep(1);
                     string c = result[i].Scores;
                     //Thread.Sleep(1);
                     string d = result[i].DateExam.ToString();
                     //Thread.Sleep(1);
                     string e1 = result[i].SCourse;
                     //Thread.Sleep(1);
                     table.Rows.Add(a, b, c, d, e1);
                 }
                 string filename = "Mark" + DateTime.Now.ToString("yyyyMMddhhmmss") + ".xls";//准备保存的文件名
                 ExcelRender.RenderToExcel(table, Context, filename);
             }
         }
     }

导出成绩Excel

附件为demo：http://pan.baidu.com/s/1gdEhWCb