public void CreateExcel(System.Data.DataTable dt, string typeid, string FileName)
{
HttpResponse resp;
resp = Page.Response;
resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
resp.ContentType = "application/ms-excel";
resp.AddHeader("Content-Disposition",
"attachment; filename=" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");
this.EnableViewState = false;
string colHeaders = "", Is_item = "";
int i = 0;
//定义表对象与行对象，同时使用DataSet对其值进行初始化
DataRow[] myRow = dt.Select("");
//typeid=="1"时导出为Excel格式文件;typeid=="2"时导出为XML文件
if (typeid == "1")
{
//取得数据表各列标题，标题之间以/t分割，最后一个列标题后加回车符
for (i = 0; i < dt.Columns.Count; i++)
{
colHeaders += dt.Columns[i].Caption.ToString() + "/t";
}
colHeaders += "/n";
resp.Write(colHeaders);
//逐行处理数据
foreach (DataRow row in myRow)
{
//在当前行中，逐列取得数据，数据之间以/t分割，结束时加回车符/n
for (i = 0; i < dt.Columns.Count; i++)
{
Is_item += row[i].ToString() + "/t";
}
Is_item += "/n";
resp.Write(Is_item);
Is_item = "";
}
}
else
{
if (typeid == "2")
{
//从DataSet中直接导出XML数据并且写到HTTP输出流中
resp.Write(dt.DataSet.GetXml());
}
}
//写缓冲区中的数据到HTTP头文件中
resp.End();
}