What ASHX HttpHandler Uses For
May 25, 2010Can u explain me what ASHX HttpHandler uses for?
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[URL]
can some expert confirm better approach
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Apr 6, 2010I got an ashx file to create an image. I am referencing it via web.config like this:
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[Code]....
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public bool IsReusable
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[code]...
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View 1 RepliesASHX Handler; Fires Up Only Once?
Jun 23, 2010I've got a simple ASHX handler that returns an dynamically generated image; the image is generated from a custom created class, and an object belonging to this class is passed to the handler using Session (I'd rather avoid using QueryString).The handler is used as the URL of an image on a ASP form which is very simple: a drop down list, a button and an image. Basically, depending on what the user selects from the list, the appropriate image will be generated once the button is pressed.
At the start the actual image has it's Visible property set to false; I don't want the handler to display anything before the data is all there.Once the button is pressed, the required Session parameter is added containing the necessary object, and the page is refreshed using Server.Transfer. When the Page_load method detects that the Session parameter has been correctly set, it sets the Visible parameter on the image to true.After that the handler fires up and generates the image.
So far so good... However, if the user now picks something different from the list and presses the button, despite the correct object being passed in the Session, the image won't be updated. In fact, the handler won't even fire up (if I put a breakpoint in there). I need to close the browser window and reopen it for it to work.Any ideas what could be the cause of such behaviour?I suspect the answer is very simple, and I just don't know something fundamental about ASP (or handlers)...
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Jun 2, 2010In my web application I use an ashx file to write a file to the browser. I've noticed that there's no compression over the .ashx file, but only over my .aspx files.
Is it possible to compress .ashx? And if it is possible, how?
Currently I use global.asax to handle the compression:
<%@ Application Language="C#" %>
<%@ Import Namespace="System.IO" %>
<%@ Import Namespace="System.IO.Compression" %>
<script runat="server">
void Application_PreRequestHandlerExecute(object sender, EventArgs e)
{
HttpApplication app = sender as HttpApplication;.......
As you can see only files which inherit from 'Page' are compressed, and my ashx file is not of type Page. So I added a condition and now it works just fine:
if (!(app.Context.CurrentHandler is Page ||
app.Context.CurrentHandler.GetType().Name == "SyncSessionlessHandler" ||
app.Context.CurrentHandler is ViewMht // This is the type I had to add
) ||
app.Request["HTTP_X_MICROSOFTAJAX"] != null)
return;
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Mar 1, 2010What is the Difference betweeen axd and ashx handlers.
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Jun 29, 2010My web site has a handler (FileDownload.ashx) that deals with all file download requests. I've recently migrated my site to ASP.Net 4.0, and it now uses routing extensively. Everything works fine when dealing with page requests (aspx), but it's not working with my handler - I encounter the following error:
Type '<snip>.Handlers.FileDownload' does not inherit from 'System.Web.UI.Page'.
This makes sense, as routing is only implemented in the page. So, my question is, what steps do I need to take to be able to use routing and my ASHX together? I want to be able to extract RouteData.Values from the url.
public class FileDownload : IHttpHandler
{
}
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using System;
using System.Web;
[code]...
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I try with the following code.
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ser.UrlEncode(pfile.FileName);
That's wrong but however I would like to use Server.UrlEncode so let know the way.
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Jan 15, 2011So I am working on a project in ASP.NET MVC 2 with C#.I have a View with a file upload but this is a flash component (.swf).The result of the file upload (the storing of the file and processing of data in the database) is done in a HTTPHandler.I would like the HTTPHandler to send information to my active controller.
Is there a way to get the controller that was used to load the view? I'm having problems finding information about it online.
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View 1 RepliesC# - Passing An Exception To An HttpHandler?
Dec 10, 2010I am trying to pass an exception to an HttpHandler by doing the following:
catch (Exception e)
{
byte[] exceptionData;
MemoryStream stream = new MemoryStream();
BinaryFormatter formatter = new BinaryFormatter(null, new StreamingContext(StreamingContextStates.Persistence));
formatter.Serialize(stream, e);
exceptionData = stream.ToArray();
WebClient client = new WebClient();
Uri handler = new Uri(ApplicationUri, "TransferException.axd");
#if DEBUG
ServicePointManager.ServerCertificateValidationCallback += new RemoteCertificateValidationCallback(BypassAllCertificateStuff);
#endif
try
{
client.UploadData(handler, exceptionData);
}
catch (WebException) { }
}
EDIT
I am getting the following exception on the client.UploadData() line.
"Content-Length or Chunked Encoding cannot be set for an operation that does not write data."
EDIT
Even if I change my call to be client.UploadString(location, "THIS IS A TEST!"); it still fails with the same exception.
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Apr 1, 2010I have an website in IIS 6.0 (windows 2003). Inside that I had configured another application (As IIS Application).
Now, When I uncommend a "add verb" tag in main web.config file, the webservice inside the application throws "404 file not found exception" Is there anything which I need to update in child web.config?
