工具——excel导出

protected void Button4_Click(object sender, EventArgs e)
{

dc.Visible = true;//dc 前台div

#region 查询条件
DataTable dt = code.GetTable("select * from TT_PreSelection ");
#endregion

if (dt.Rows.Count > 200)
{
MessageBox.show(this, "当前数据量超过200条，请筛选后导出！", "");
}
else
{
dtA = dt;

Export("application/ms-excel", "excel导出.xls");
dc.Visible = false;
}
}

private void Export(string FileType, string FileName)
{
Response.Charset = "GB2312";
Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
Response.Write("<meta http-equiv=Content-Type content=\"text/html; charset=GB2312\">");
Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString());
Response.ContentType = FileType;
this.EnableViewState = false;
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);

dc.RenderControl(hw);

Response.Write(tw.ToString());
Response.End();
}