ExtAspNet下通过文档路径实现文档的下载

<ext:Button ID="Button1" runat="server" Text="Button" OnClick="Button1_Click" EnableAjax="false">//<span style="font-family: Arial, Helvetica, sans-serif;">EnableAjax="false"最重要了</span>

</ext:Button>

protected void Button1_Click(object sender, EventArgs e)
{
try
{
string filepath = "E:\\123.xls";
string filename = System.IO.Path.GetFileName(filepath);
Response.Clear();
Response.ClearHeaders();
Response.Buffer = false;
Response.ContentType = "application/octet-stream";
//Response.ContentEncoding=System.Text.Encoding.GetEncoding("utf-8");
Response.AddHeader("Content-Disposition", "attachment; filename=" + System.Web.HttpUtility.UrlEncode(filename, Encoding.UTF8));
Response.WriteFile(filepath);
Response.Flush();
Response.End();
}
catch (Exception E)
{
//alert("没有找到您所要下载的数据！");
}
}