perform background processing when form is submitted

I have an action method which runs when a user submits a form.

An image URL is passed with the model.

I want to be able to perform some processing on the (downloaded) image, but i don't want a delay in t开发者_如何学编程his processing to affect the user experience.

so how can i do this processing in the background whilst happily submitting the form? e.g.:

ProcessImage(imageUrl); //do this in the background without delaying user experience  

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Until you are receiving the Image you cant change the user's page .

However after you gt the image you can do the required processing in BackGroundWorker and submit the page. And let the user see new required Page.

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Show a busy screen on the client that lets the user know that he's waiting for a file download. You could achieve this i.e. by downloading to a separate iframe and checking the status of the iframe (for a dynamic approach see Dynamically created iframe used to download file triggers onload with firebug but not without)

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You can use jQuery to post the imageurl. Your callback will be called when it's done.

function ProcessImageUrl(imgurl) 
{ 
   $.post('<%= Url.Action("AjaxProcessImage","AjaxFunctions") %>'
      , { url: imgurl }
      , function (data) {
         if (data.success) {
           alert("I'm done processing the image");
         }
         else {
            alert("Darn an error occurred: " + data.msg);
         }
   });
}

In a controller called AjaxFunctionsController

   public ActionResult AjaxProcessImage(string url)
   {
      try
      {
          ProcessImage(url);
      }
      catch(System.Exception ex)
      {
         return Json(
               new
               {
                  success = false,
                  msg = ex.Message
               });
       }

      return Json(
            new
            {
               success = true
            });
   }