File downloading in a BackgroundWorker

Question

Currently, I can do

string strXMLfile = FileDownload("http://link/to/some/xml/file");

to download the contents of a file into a string. Is there a way to execute the file download in a BackgroundWorker and still have the method FileDownload return the contents of the requested file?

tim dinh · Answer

Something like below? Func fileDownload = new Func (FileDownload); fileDownload.BeginInvoke("url",new AsyncCallback(FileDownloadCallback),fileDownload); private void FileDownloadCallback(IAsyncResult result) { Func fileDownload = result.AsyncState as Func ; string fileContent = fileDownload.EndInvoke(result); }

Pieter De Decker · Answer

Both of you made good suggestions that I will certainly keep in mind for other programs. For this particular program, I decided to put the method containing the call to FileDownload in a BackgroundWorker, since my program would still lag too much if I only put the file downloading code in a BackgroundWorker.

Ashley Argile · Answer

I'm not sure if this is what you wanted... Add a backgroundWorker and handle the following events.. private void backgroundWorker1_DoWork(object sender, DoWorkEventArgs e) { file = FileDownload((string)e.Argument); } private void backgroundWorker1_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e) { MessageBox.Show(file); } start the download with - backgroundWorker1.RunWorkerAsync("http://link/to/some/xml/file"); Store the output of FileDownload in a local variable and retrieve it when the RunWorkerCompleted event fires. Hope this helps.. regards Ashley

File downloading in a BackgroundWorker

Answers (3)