public void btnRemoveAll_Click(System.Object sender, System.EventArgs e)
{
DownloadFileAsyncExtended wClient = default(DownloadFileAsyncExtended);
//// Always loop backwards when removing items from the list,
//// because the index gets updated when an item is removed.
//// This can result in certain items not getting removed.
for (int i = ListViewEx.Items.Count - 1; i >= 0; i--)
{
if (ListViewEx.Items[i].Tag != null)
{
//// Get the DownloadFileAsyncExtended class instance from the ListViewItem Tag.
wClient = (DownloadFileAsyncExtended)(ListViewEx.Items[i].Tag);
//// Pause (cancel) the download and remove it from the list.
wClient.CancelAsync();
ListViewEx.Items[i].Tag = null;
ListViewEx.Items[i].Remove();
}
else
{
//// There's nothing to cancel, because the
//// download has finished or caused an error.
//// Just remove the item from the list.
ListViewEx.Items[i].Remove();
}
}
}
public void btnPauseAll_Click(System.Object sender, System.EventArgs e)
{
DownloadFileAsyncExtended wClient = default(DownloadFileAsyncExtended);
for (int i = 0; i <= ListViewEx.Items.Count - 1; i++)
{
if (ListViewEx.Items[i].Tag != null)
{
wClient = (DownloadFileAsyncExtended)(ListViewEx.Items[i].Tag);
//// Pause the download.
wClient.CancelAsync();
}
}
}
public void FormMain_FormClosing(object sender, System.Windows.Forms.FormClosingEventArgs e)
{
DownloadFileAsyncExtended wClient = default(DownloadFileAsyncExtended);
for (int i = 0; i <= ListViewEx.Items.Count - 1; i++)
{
//// Check if the Tag isn't Nothing, because else the download has already
//// finished or an error occurred, so it can't be cancelled.
if (ListViewEx.Items[i].Tag != null)
{
//// Get the DownloadFileAsyncExtended class instance from the ListViewItem Tag.
wClient = (DownloadFileAsyncExtended)(ListViewEx.Items[i].Tag);
//// Cancel the download if it's still busy.
wClient.CancelAsync();
}
}
}
public void btnResumeAll_Click(System.Object sender, System.EventArgs e)
{
DownloadFileAsyncExtended wClient = default(DownloadFileAsyncExtended);
for (int i = 0; i <= ListViewEx.Items.Count - 1; i++)
{
if (ListViewEx.Items[i].Tag != null)
{
wClient = (DownloadFileAsyncExtended)(ListViewEx.Items[i].Tag);
//// Make sure you check if the download is not
//// already busy or an exception will be thrown.
if (wClient.IsBusy == false)
{
wClient.ResumeAsync();
}
}
}
}
public void StartDownload(string URL, string LocalFilePath)
{
DownloadFileAsyncExtended wClient = new DownloadFileAsyncExtended();
//// Add some initial data to the Listview.
ListViewItem lvw = this.Items.Add(Path.GetFileName(LocalFilePath));
lvw.SubItems.Add("0 Bytes"); //// Total Size.
lvw.SubItems.Add("Initializing..."); //// Status.
lvw.SubItems.Add("0 Bytes"); //// Completed.
lvw.SubItems.Add("0"); //// Progress Percentage. NOTE: Only add a number here, no letters/signs!
lvw.SubItems.Add("0 kB/s"); //// Download Speed.
lvw.SubItems.Add("00:00:00"); //// Download Time.
lvw.SubItems.Add("00:00:00"); //// Remaining Time.
lvw.ImageKey = "Initializing"; //// Initializing image.
//// Store the DownloadFileAsyncExtended class instance in the Tag,
//// so we can use it later to cancel/resume the download if necessary.
lvw.Tag = wClient;
//// Add Event handlers, so we can update the progress to the user.
wClient.DownloadProgressChanged += DownloadProgressChanged;
wClient.DownloadCompleted += DownloadCompleted;
//// IMPORTANT !!
//// If you don't add this line, then all events are raised on a separate
//// thread and you will get cross-thread errors when accessing the Listview
//// or other controls directly in the raised events.
wClient.SynchronizingObject = this;
//// Update frequency. You can select NoDelay, HalfSecond or Second.
//// HalfSecond and Second will prevent the DownloadProgressChanged event
//// from firing continuously and hogging CPU when updating the controls.
//// If you download small files that could be downloaded within a second,
//// then set it to NoDelay or the progress might not be visible.
wClient.ProgressUpdateFrequency = DownloadFileAsyncExtended.UpdateFrequency.Second;
//// The method to actually download a file. The userToken parameter can
//// for example be a control you wish to update in the DownloadProgressChanged
//// and DownloadCompleted events. A ListViewItem in this example.
wClient.DowloadFileAsync(URL, LocalFilePath, lvw);
//// Set wClient to Nothing, because we don't need it anymore. Free storage
wClient = null;
}
