<form id="form1" runat="server">

         <div>

             <asp:FileUpload ID="ExcelFileUpload" runat="server" />

             <asp:Button ID="UploadBtn" runat="server" Text="确定上传" OnClick="UploadBtn_Click" />

         </div>

     </form>

 protected void UploadBtn_Click(object sender, EventArgs e)

 {

     if (ExcelFileUpload.HasFile == false)//HasFile用来检查FileUpload是否有文件

     {

         Response.Write("<script>alert('请您选择Excel文件')</script> ");

         return;//当无文件时,返回

     }

     string IsXls = Path.GetExtension(ExcelFileUpload.FileName).ToString().ToLower();//System.IO.Path.GetExtension获得文件的扩展名

     if (IsXls != ".xlsx" && IsXls != ".xls")

     {

         Response.Write(ExcelFileUpload.FileName);

         Response.Write("<script>alert('只可以选择Excel文件')</script>");

         return;//当选择的不是Excel文件时,返回

     }

     string filename = ExcelFileUpload.FileName;//获取Execle文件名

     string savePath = Server.MapPath(("UploadExcel\\") + filename);//Server.MapPath 服务器上的指定虚拟路径相对应的物理文件路径

     //savePath ="D:\vsproject\Projects\exceltestweb\exceltestweb\uploadfiles\test.xls"

     //Response.Write(savePath);

     DataTable ds = new DataTable();

     ExcelFileUpload.SaveAs(savePath);//将文件保存到指定路径

     DataTable dt = GetExcelDatatable(savePath);//读取excel数据

     List<RegNumInfo> regList = ConvertDtToInfo(dt);//将datatable转为list

     File.Delete(savePath);//删除文件

     Response.Write("<script>alert('上传文件读取数据成功！');</script>");

 }

 /// <summary>

 /// 从excel文件中读取数据

 /// </summary>

 /// <param name="fileUrl">实体文件的存储路径</param>

 /// <returns></returns>

 private static DataTable GetExcelDatatable(string fileUrl)

 {

     //支持.xls和.xlsx，即包括office2010等版本的;HDR=Yes代表第一行是标题，不是数据；

     string cmdText = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + fileUrl + "; Extended Properties=\"Excel 12.0;HDR=Yes\"";

     System.Data.DataTable dt = null;

     //建立连接

     OleDbConnection conn = new OleDbConnection(cmdText);

     try

     {

         //打开连接

         if (conn.State == ConnectionState.Broken || conn.State == ConnectionState.Closed)

         {

             conn.Open();

         }

         System.Data.DataTable schemaTable = conn.GetOleDbSchemaTable(OleDbSchemaGuid.Tables, null);

         string strSql = "select * from [Sheet1$]";   //这里指定表明为Sheet1,如果修改过表单的名称，请使用修改后的名称

         OleDbDataAdapter da = new OleDbDataAdapter(strSql, conn);

         DataSet ds = new DataSet();

         da.Fill(ds);

         dt = ds.Tables[]; ;

         return dt;

     }

     catch (Exception exc)

     {

         throw exc;

     }

     finally

     {

         conn.Close();

         conn.Dispose();

     }

 }

 /// <summary>

 /// 将datatable转换为list集合

 /// </summary>

 /// <param name="dt">DataTable</param>

 /// <returns></returns>

 private static List<RegNumInfo> ConvertDtToInfo(DataTable dt)

 {

     List<RegNumInfo> list = new List<RegNumInfo>();

     if (dt.Rows.Count > )

     {

         foreach (DataRow item in dt.Rows)

         {

             RegNumInfo info = new RegNumInfo();

             info.RegNum = item[].ToString();

             info.Name = item[].ToString();

             info.Period = item[].ToString();

             info.Remark = item[].ToString();

             list.Add(info);

         }

     }

     return list;

 }

 public class RegNumInfo

 {

     public string RegNum { get; set; }

     public string Name { get; set; }

     public string Period { get; set; }

     public string Remark { get; set; }

 }