c# Background worker class

Question

I want to put this method into background worker class, i am trying but stuck, can any one help me how to run this method into background worker class:
I am calling this method into my asp.net page, where file are zipped on server and then returend to the client. but zipping of file may take longer and user will see a busy screen, so to avoid that i want to use background worker class:

[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.ReadWrite)] public string Zip(string f, bool original) { string zip = ""; try { files = HttpContext.Current.Server.UrlDecode(files); string[] fileCollection = files.Split('*'); zipFile = class1.zipfile(fileCollection, IsOriginal); int fileLength = files.Length; } catch (Exception ex) { Console.WriteLine("Exception during processing {0}", ex); } return File; }

what have you tried? how far have you got? MSDN has an example of using BackgroundWorker - it should be simply a case of putting your code in place of theirs. Also, note that background worker is more commonly used to avoid blocking a UI - sure, you can use it from a console, but that is less common. In many ways, I might just use ThreadPool here... — Marc Gravell
– Marc Gravell, Commented Feb 8, 2011 at 9:39
Your method does not give much sense. First off, zip is never used. And you are returning File that does not exist anywhere. — Øyvind Bråthen
– Øyvind Bråthen, Commented Feb 8, 2011 at 9:40
@ marc Gravell: I am confused by how to pass arguments to the methods and also this method is returning a value so i am confuse with it, — safi
– safi, Commented Feb 8, 2011 at 9:40
Why do you feel that you need to use a BackgroundWorker in a web app? Who told you to do that? — Cody Gray
– Cody Gray ♦, Commented Feb 8, 2011 at 9:52
Personally I think you are looking at the wrong options; you would do better to start again in a new question with what you want to achieve, rather than how you are currently doing it, since BackgroundWorker is just not the right option here. This is something that is too big to do in combination with any single request - I suspect you will need to do this entirely out of band (perhaps a long-running thread, or perhaps shell an exe), and update something in the user's state that later (when they subsequently make a request) advertises a URL that they might use, or sends them an e-mail. — Marc Gravell
– Marc Gravell, Commented Feb 8, 2011 at 11:03

Øyvind Bråthen · Accepted Answer · 2011-02-08 10:08:24Z

It seems your problem is returning the value from the BackgroundWorker. That can be done like this:

In the worker's DoWork method, set the e.Result to what you want to return:

private void backgroundWorker_DoWork(object sender, DoWorkEventArgs e) { ... e.Result = File; }

Then, in the RunWorkerCompleted method, you can access this value in the main thread:

private void backgroundWorker1_RunWorkerCompleted( object sender, RunWorkerCompletedEventArgs e) { string result = e.Result as string; }

I have assumed that File is string here, but you can cast it to your required object.

Why you need it in a web application I have no clue, but this is how to do it at least ;)

Thanks, I need in the web APP because I am calling this method into my asp.net page, where file are zipped on server and then returend to the client. but zipping of file may take longer if file size is e.g. 500 mb and user will see a busy page until the processing of zipping is completed and the chrome/mozilla recognize as a suspecisous script running so ask the user to kill the page :(
Wouldn't it be better to do this using AJAX to keep the client responsive, while the server is working. The A in AJAX stands for Asynchronous for a reason ;)
@ I m already using ajax on this method: like [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.ReadWrite)]

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