First we need to import three new namespaces in addition to the ones we already have.
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using System.Diagnostics;
using System.IO;
using System.Net;
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Then we add the two following global variables.
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WebClient webClient; // Our WebClient that will be doing the downloading for us
Stopwatch sw = new Stopwatch(); // The stopwatch which we will be using to calculate the download speed
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Then finally we have our main methods that will do all the handling and displaying of the information.
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public void DownloadFile(string urlAddress, string location)
{
using (webClient = new WebClient())
{
webClient.DownloadFileCompleted += new AsyncCompletedEventHandler(Completed);
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(ProgressChanged);
// The variable that will be holding the url address (making sure it starts with http://)
Uri URL = urlAddress.StartsWith("http://", StringComparison.OrdinalIgnoreCase) ? new Uri(urlAddress) : new Uri("http://" + urlAddress);
// Start the stopwatch which we will be using to calculate the download speed
sw.Start();
try
{
// Start downloading the file
webClient.DownloadFileAsync(URL, location);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
// The event that will fire whenever the progress of the WebClient is changed
private void ProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
// Calculate download speed and output it to labelSpeed.
labelSpeed.Text = string.Format("{0} kb/s", (e.BytesReceived / 1024d / sw.Elapsed.TotalSeconds).ToString("0.00"));
// Update the progressbar percentage only when the value is not the same.
progressBar.Value = e.ProgressPercentage;
// Show the percentage on our label.
labelPerc.Text = e.ProgressPercentage.ToString() + "%";
// Update the label with how much data have been downloaded so far and the total size of the file we are currently downloading
labelDownloaded.Text = string.Format("{0} MB's / {1} MB's",
(e.BytesReceived / 1024d / 1024d).ToString("0.00"),
(e.TotalBytesToReceive / 1024d / 1024d).ToString("0.00"));
}
// The event that will trigger when the WebClient is completed
private void Completed(object sender, AsyncCompletedEventArgs e)
{
// Reset the stopwatch.
sw.Reset();
if (e.Cancelled == true)
{
MessageBox.Show("Download has been canceled.");
}
else
{
MessageBox.Show("Download completed!");
}
}
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