转自 http://www.cnblogs.com/vipsoft/p/3298299.html protected void Page_Load(object sender, EventArgs e){     ScriptManager sm = Page.Master.FindControl("ScriptManager1") as ScriptManager;    if (sm != null)    {        foreach (GridViewRow item in gvInvoiceHistory.Rows)        {            LinkButton lbtnTemp = item.FindControl("btnInvoiceNumber") as LinkButton;            if (lbtnTemp != null)            {                sm.RegisterPostBackControl(lbtnTemp);            }        }    }  }protected void btnInvoiceNumber_OnClick(object sender, EventArgs e){    LinkButton btnTemp = sender as LinkButton;    if (btnTemp != null)    {        var path = ConfigurationManager.AppSettings["InvoicePdfPath"];        var fileName = btnTemp.Text.Trim() + ".pdf";        if (!FileHandler.DownLoadFile(path, fileName))        {            var msg = GetLocalResourceObject("InvoiceIsNotAvailable").ToString();            ScriptManager.RegisterStartupScript(upMain, upMain.Page.GetType(), "DownLoadFile", string.Format("alert('{0}');", msg), true);             //如果不存在就跳转，参见 http://www.cnblogs.com/vipsoft/p/3627683.html　　　　　　//string url = "http://www.vipsoft.com.cn";　　　　　　//ResponseRedirect.Redirect(Response, url, "_blank", "'toolbar=0,scrollbars=1,status=0,menubar=0,resizable=1,top=0,left=0,height=800,width=1000");}        }    }}//Updatepanel 会有异常 参考下面的链接查看下载方法public static bool DownLoadFile(string path,string fileName){    bool result = false;    string filePath = HttpContext.Current.Server.MapPath(path + fileName);    if (File.Exists(filePath))    {        FileInfo fileInfo = new FileInfo(filePath);        HttpContext.Current.Response.Clear();        HttpContext.Current.Response.ClearContent();        HttpContext.Current.Response.ClearHeaders();        HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);        HttpContext.Current.Response.AddHeader("Content-Length", fileInfo.Length.ToString());        HttpContext.Current.Response.AddHeader("Content-Transfer-Encoding", "binary");        HttpContext.Current.Response.ContentType = "application/octet-stream";        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");        HttpContext.Current.Response.WriteFile(fileInfo.FullName);        HttpContext.Current.Response.Flush();        HttpContext.Current.Response.End();        result = true;    }    return result;}

 

ScriptManager1 放在 MasterPage中，查找 ScriptManager1 时，

Page.Master.FindControl("ScriptManager1") as ScriptManager;

 

FileHandler文件下载：

如果不存在就跳转，参见 http://www.cnblogs.com/vipsoft/p/3627683.html