public static void CreateExcel(DataSet ds)
{
string filename = DateTime.Now.ToString("yyyyMMddHHmmssff") + ".xls";
HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + filename);
string colHeaders = "", ls_item = "";
//定义表对象与行对象，同时用DataSet对其值进行初始化
DataTable dt = ds.Tables[0];
DataRow[] myRow = dt.Select();//可以类似dt.Select("id>10")之形式达到数据筛选目的
int i = 0;
int cl = dt.Columns.Count;
//取得数据表各列标题，各标题之间以\t分割，最后一个列标题后加回车符
for (i = 0; i < cl; i++)
{
if (i == (cl - 1))//最后一列，加\n
{
colHeaders += dt.Columns[i].Caption.ToString() + "\n";
}
else
{
colHeaders += dt.Columns[i].Caption.ToString() + "\t";
}
}
HttpContext.Current.Response.Write(colHeaders);
//向HTTP输出流中写入取得的数据信息
//逐行处理数据
foreach (DataRow row in myRow)
{
//当前行数据写入HTTP输出流，并且置空ls_item以便下行数据
for (i = 0; i < cl; i++)
{
if (i == (cl - 1))//最后一列，加\n
{
ls_item += row[i].ToString() + "\n";
}
else
{
ls_item += row[i].ToString() + "\t";
}
}
HttpContext.Current.Response.Write(ls_item);
ls_item = "";
}
HttpContext.Current.Response.End();
}