How to invoke a function but don't wait to finish - ASP.NET

Question

I got one page where i do some file manipulation, and when file is done, i need to upload to amazon s3. Sometimes file can be large, so user on submit need to wait too much. How can i make something like

File manipulation
When is done, i send file name parameters to some function
I don't need to wait for that function, i want to use Response.Redirect before uploading is done.

you can use ajax asynch uploader control for that but cant redirect upto upload is finish. — Sunil Chavan, Apr 07 '12 at 18:10

Andriy Buday · Accepted Answer · 2012-04-07T18:42:27.040

9

Easiest way to do this:

ThreadPool.QueueUserWorkItem(YourUploadMethod);

There is some comment below arguing with this, so I wrote this:

    protected void Page_Load(object sender, EventArgs e)
    {
        ThreadPool.QueueUserWorkItem(YourUploadMethod);

        Response.Redirect("http://google.com");
    }

    public void YourUploadMethod(object state)
    {
        Thread.Sleep(7000);
    }// breakpoint: I was redirected to google and then debugger stopped me here

edited Apr 07 '12 at 18:42

answered Apr 07 '12 at 18:15

Andriy Buday

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I don't think this method will work for asp.net, because once the main thread finishes, the background threads die as well (regardless if they are finished or not). – hofnarwillie Apr 07 '12 at 18:20
3

I think Response.End, Response.Redirect, or Server.Transfer will only abort main thread. See this question: http://stackoverflow.com/questions/1087777/is-response-end-considered-harmful – Andriy Buday Apr 07 '12 at 18:47

score 1 · Answer 2 · answered Apr 07 '12 at 18:09

1

You need to start the method on a different thread - since you don't have to wait for the function to return, you don't need a callback.

See the Thread class and the Task class.

answered Apr 07 '12 at 18:09

Oded

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How to invoke a function but don't wait to finish - ASP.NET

2 Answers2