把dataset数据保存到excel,GridView导出到excel

把dataset数据保存到excel
public void CreateExcel(DataSet ds, string FileName)
{
HttpResponse resp;
resp = Page.Response;
resp.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
resp.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";
}
}
resp.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";
}
}
resp.Write(ls_item);
ls_item = "";
}
resp.End();
}

/// <summary>
/// 导出成为Excel
/// </summary>
/// <param name="exportTargetGridView">目标GridView</param>
public void ExportExcel(GridView exportTargetGridView)
{
HttpContext.Current.Response.ClearContent();

HttpContext.Current.Response.Charset = "GB2312";

HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.UTF7;

HttpContext.Current.Response.AddHeader("content-disposition", "attachment; filename=MyExcelFile.xls");

HttpContext.Current.Response.ContentType = "application/excel";

StringWriter sw = new StringWriter();

HtmlTextWriter htw = new HtmlTextWriter(sw);

exportTargetGridView.RenderControl(htw);

HttpContext.Current.Response.Write(sw.ToString());

HttpContext.Current.Response.End();
}

public override void VerifyRenderingInServerForm(Control control)//注意重写这个函数
{

}