CODEWITHSUNDEEP
javascriptc#
Karthik Ravichandran
Karthik Ravichandran

Reputation: 1283

How to cancel the file copying in c#?

I have added the below codes to copying the files in my local machine. In my case, if the user click the cancel button, i would like to stop the file copy progress using c#. My code is below.

JS code:

for(var i = 0; i < file.length; i++){
   var formdata = new FormData();
   formdata.append("Files", file[i]);
   var ajax = new XMLHttpRequest();
   ajax.upload.addEventListener("progress", progressHandler, false);
   ajax.addEventListener("load", completeHandler, false);
   ajax.addEventListener("error", errorHandler, false);
   ajax.addEventListener("abort", abortHandler, false);
   ajax.open("POST", "/Save");
   ajax.send(formdata);
}

C# code:

using (FileStream stream = new FileStream(fullPath, FileMode.Append, FileAccess.Write, FileShare.ReadWrite))
{
    using (Content)
    {
        Content.CopyTo(stream);
    }
}

I have the cancel button to cancel the file progresss. In that i have aborted the ongoing progress. I have tried the abort() in xml to block the request but it doesn't block the file copying. How can i achieve my requirement.

Upvotes: 0

Views: 789

Answers (1)

Benoit B.
Benoit B.

Reputation: 65

You should have a look on the Async method with the Cancelation token (link)

In save you create a CancellationTokenSource (link) and store it somewhere

Your cancel button then call another endpoint like Cancel (inspired ;) ) that call the Cancel() method on you tokenSource. (CancellationTokenSource has a Token property for your CopyToAsync call)

Regards, Benoit.

ps: you may want to store some unique id along the request if you want to have several users on several files.

EDIT based on @greggz and @Liam comments: You should also move your HTTP endpoint to an async one :)

Upvotes: 1

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