Using HTTPHandler for file downloading [Answered]RSS

• • Reply
  skosko

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  Using HTTPHandler for file downloading

  Dec 26, 2011 04:44 AM|skosko|LINK

  Hi All,

  I have an ASP.NET(3.5) web application. My app. generates excel/pdf reports for users.

  I use Response.TransmitFile to make users download the report. It can take some time(~5 mins.) to produce a report. I don't want users to click "Report" button while report is generated.

  I disable "Report" button in javascript when it is pressed but I cannot enable again after I use Response.TransmitFile.

  I don't want to enable the button manually after some time in javascript or add a cookie to Response and check it continuously in javascript whether cookie is created or not.

  Is there a way to deal with this by using HTTPHanlder or any other suggestions?

  Thanks.

  httphandler

• • Reply
  Thulasiram

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  Re: Using HTTPHandler for file downloading

  Dec 26, 2011 10:26 AM|Thulasiram|LINK

  Yes you can done through httpHandler. Give Handler relative path to hyperlink. Send input parameters in query string.And access data from your storage. and write the content.

• • Reply
  skosko

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  Re: Using HTTPHandler for file downloading

  Dec 26, 2011 10:39 AM|skosko|LINK

  Hi,

  I am not familiar with HTTPHandler concept.

  Could you share an example?

  Thanks.

  Thulasiram

  Yes you can done through httpHandler. Give Handler relative path to hyperlink. Send input parameters in query string.And access data from your storage. and write the content.

• • Reply
  Thulasiram

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  88 Posts

  Re: Using HTTPHandler for file downloading

  Dec 26, 2011 11:12 AM|Thulasiram|LINK

  <asp:HyperLink id="hyperlink1"
                                                       Text="Download"
                                     runat="server"/>

  InCode Behind :

  hyperlink1.NavigateUrl = "Handler.ashx?file="+"filename";

  <%@ WebHandler Language="C#" Class="Handler" %>
  
  using System;
  using System.Web;
  
  public class Handler : IHttpHandler {
  
      public void ProcessRequest (HttpContext context) {
  
  	HttpResponse r = context.Response;
  	r.ContentType = "image/png";
  	//
  	// Write the requested image
  	//
  	string file = context.Request.QueryString["file"];
  
  // Get Data From Database. And write file.
  	if (file == "logo")
  	{
  	    r.WriteFile("Logo1.png");
  	}
  	else
  	{
  	    r.WriteFile("Flower1.png");
  	}
      }
  
      public bool IsReusable {
  	get {
  	    return false;
  	}
      }
  }