日期:2014-05-17  浏览次数:20485 次

求解ADO.NET导出EXCEL(指定单元格)
#region 导出excel
  // 根据模板文件创建副本
  string name = DateTime.Now.ToString("yyyyMMddhhmmss");
  string webPath = string.Format("~/xlsTemplate/{0}.xls", name);
  string filePath = Server.MapPath(webPath);
  File.Copy(Server.MapPath("~/xlstemp/train.xls"), filePath);
  // 使用OleDb驱动程序连接到副本
  OleDbConnection conn = new OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + filePath + ";Extended Properties=\"Excel 8.0;HDR=NO\"");
  using (conn)
  {
  conn.Open();
  //// 增加记录
  //foreach (DataRow item in ds.Tables[0].Rows)
  //{
  OleDbCommand cmd = new OleDbCommand("UPDATE [Sheet1$] SET B2='Aaron'", conn);
  cmd.ExecuteNonQuery();
  cmd.Dispose();
  //}

  }
  // 输出副本的二进制字节流
  Response.Clear();
  Response.ContentType = "application/ms-excel";
  Response.AppendHeader("Content-Disposition", "attachment;filename=" + name + ".xls");
  Response.BinaryWrite(File.ReadAllBytes(filePath));

  // 删除副本
  File.Delete(filePath);
  #endregion

******************************************************************
错误提示:至少一个参数没有被指定值。 
难道不能直接操作单元格么?还是对XLS模板有特殊要求。希望各位前辈指点迷津。

------解决方案--------------------
使用 ADO.NET 更新 Excel 中指定单元格的内容

需要注意是:1,IMEX必须设置为2;2,该列的数据类型最好要一致。下面的例子更新B11单元格的内容。 
ASPX 代码
C# code

<%@ Page Language="C#" Debug="true" %>

<%@ Import Namespace="System.Data" %>
<%@ Import Namespace="System.Data.OleDb" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  String ConnectionString = String.Empty;
  protected void Page_Load(object sender, EventArgs e)
  {
    ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Server.MapPath("excel.xls") + ";Extended Properties='Excel 8.0;HDR=No;IMEX=2;'";
    if (!IsPostBack)
    {
      DataBindExcel();
    }
  }

  protected void UpDate_Click(object sender, EventArgs e)
  {
    using (OleDbConnection cn = new OleDbConnection(ConnectionString))
    {
      cn.Open();
      String sql = "UPDATE [Sheet1$B11:B11] SET F1 = '" + DateTime.Now.ToString() + "'";
      OleDbCommand cmd = new OleDbCommand(sql, cn);
      cmd.ExecuteNonQuery();
      cn.Dispose();
    }
    Response.Redirect(Request.UrlReferrer.ToString());
  }

  private void DataBindExcel()
  {
    using (OleDbConnection cn = new OleDbConnection(ConnectionString))
    {
      cn.Open();
      String sql = "select * FROM [Sheet1$]";
      OleDbCommand cmd = new OleDbCommand(sql, cn);
      GridView1.DataSource = cmd.ExecuteReader();
      GridView1.DataBind();
      cn.Dispose();
    }
  }
</script>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
</head>
<body>
  <form id="form1" runat="server">
  <asp:GridView ID="GridView1" runat="server">
  </asp:GridView>
  <asp:Button ID="UpDate" Text="更新数据为当前日期" runat="server" OnClick="UpDate_Click" />
  </form