前些时间有朋友为了完成此功能，就硬把数据导入DataGrid再导出到Excel。这实在是多此一举。
解决办法：
通过Linq将数据读出，并直接写入数据流中
代码如下：
public partial class DataToExcel : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
DataAccess.DataClassesDataContext db = new DataClassesDataContext();
var qu = from t in db.TXLInfos
select t;
Response.AppendHeader("Content-Disposition", "attachment;filename=result.xls");
Response.ContentType = "application/ms-excel";
Response.Charset = "gb2312";
Response.ContentEncoding = Encoding.GetEncoding("gb2312");
System.IO.StringWriter writer = new System.IO.StringWriter();
foreach(TXLInfo item in qu)
{
writer.Write(item.GQName);
writer.Write("\t");
writer.Write(item.GQID);
writer.WriteLine();
}
Response.Write(writer.ToString());
Response.End();
}
}