WebClient using file (file in use error)

Question

I'm new to WinForms/C#/VB.NET and all and am trying to put together a simple application which downloads an MP3 file and edits its ID3 tags. This is what I've come up with so far :

Uri link = new System.Uri("URL");
wc.DownloadFileAsync(link, @"C:/music.mp3");
handle.WaitOne();

var file = TagLib.File.Create(@"C:/music.mp3");
file.Tag.Title = "Title";
file.Save();

The top section downloads the file with a pre-defined WebClient, but when I try to open the file in the first line of the second half, I run into this error The process cannot access the file 'C:\music.mp3' because it is being used by another process. which I'm guessing is due to the WebClient.

Any ideas on how to fix this? Thanks.

Here seems to be the answer for you http://stackoverflow.com/a/28217960/920557 and the idea I guess is to Dispose the client before opening the file again. — Eugene Komisarenko, Apr 26 '17 at 19:51
If you are writing to Most systems don't give you rights to create files on the root of `C:/` unless your app is an administrator. You may want to try to save it in a subfolder. — Scott Chamberlain, Apr 26 '17 at 19:52
Yes, @EugeneKomisarenko is right. There is no need for async call in your particular case. Just replace the second line with `wc.DownloadFile(link, @"C:/music.mp3");` and remove the third one. — Dmitry Egorov, Apr 26 '17 at 19:55
You want to keep the Async method otherwise the UI will freeze up during download. — Sam Axe, Apr 26 '17 at 19:59

score 2 · Accepted Answer · answered Apr 26 '17 at 19:58

If using WebClient.DownloadFileAsync you should subscribe to the DownloadFileCompleted event and perform the remainder of your processing from that event.

Quick and dirty:

WebClient wc = new WebClient();
wc.DownloadfileCompleted += completedHandler;
Uri link = new System.Uri("URL");
wc.DownloadFileAsync(link, @"C:/music.mp3");
//handle.WaitOne();  // dunno what this is doing in here.

function completedHandler(Object sender, AsyncCompletedEventArgs e) {
    var file = TagLib.File.Create(@"C:/music.mp3");
    file.Tag.Title = "Title";
    file.Save();
}

WebClient using file (file in use error)

1 Answers1