方法：
[STAThread]///这是必须的
public override void VerifyRenderingInServerForm(System.Web.UI.Control control)
{
//base.VerifyRenderingInServerForm(control);
}
public void OutExcel() {
dsExcel = OPA_HistoryEmployee.GetChineseHistoryEmployeeList(opa_historyemployee);
opa_appraiseinfo.ID=AppInfoId; opa_appraiseinfo.CompanyID = CompanyID;
opa_appraiseinfo = OPA_AppraiseInfo.GetAppraiseInfoByID(opa_appraiseinfo);
string FileName = opa_appraiseinfo.Title+"_"+DateTime.Now.ToString("yyyy年MM月dd日")+".xls";
HttpResponse resp; resp = Page.Response;
resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
resp.AppendHeader("Content-Disposition", "attachment;filename=" + FileName);
resp.ContentType = "application/vnd.ms-xls";
string colHeaders = "", ls_item = "";
int i = 0;
//定义表对象和行对像，同时用DataSet对其值进行初始化
DataRow[] myRow = dsExcel.Tables[0].Select();
//取得数据表各列标题，各标题之间以 分割，最后一个列标题后加回车符
for (i = 0; i < dsExcel.Tables[0].Columns.Count; i++) {
if (i == dsExcel.Tables[0].Columns.Count - 1) {
colHeaders += dsExcel.Tables[0].Columns[i].Caption.ToString() + " ";
} else
{
colHeaders += dsExcel.Tables[0].Columns[i].Caption.ToString() + " ";
}
} //向HTTP输出流中写入取得的数据信息
resp.Write(colHeaders);
//逐行处理数据
foreach (DataRow row in myRow) {
//在当前行中，逐列获得数据，数据之间以 分割，结束时加回车符
for (i = 0; i < dsExcel.Tables[0].Columns.Count; i++)
{
if (i == dsExcel.Tables[0].Columns.Count - 1)
{
ls_item += row[i].ToString() + " ";
} else
{
ls_item += row[i].ToString() + " ";
}
}
//当前行数据写入HTTP输出流，并且置空ls_item以便下行数据
resp.Write(ls_item);
ls_item = "";
}
resp.End(); }