To cancel a WebClient download you just need to use the CancelAsync method of the created web client. The possibility to cancel a download is an important basic in the lifecycle of a file download. To test the snippet, add a progressbar to your form and execute the downloadFile method with some action i.e a button click.Īs a plus, you can show the total of pending bytes from the filesize (in bytes) of the file in the DownloadProgressChanged event : private void wc_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)Ĭonsole.WriteLine(e.ProgressPercentage + "% | " + e.BytesReceived + " bytes out of " + e.TotalBytesToReceive + " bytes retrieven.") MessageBox.Show("File succesfully downloaded") Īs the method is asynchronous, we need to instance the callbacks properly in the downloadFile method. MessageBox.Show("An error ocurred while trying to download file") If (e.Error != null) // We have an error! Retry a few times, then abort. MessageBox.Show("The download has been cancelled") Private void wc_DownloadFileCompleted(object sender, AsyncCompletedEventArgs e) ProgressBar1.Value = e.ProgressPercentage Console.WriteLine(e.ProgressPercentage) In case you don't have a progressBar Log the value instead Private void wc_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e) / Show the progress of the download in a progressbar Wc.DownloadFileAsync(new Uri(url), desktopPath + "/" + filename) Wc.DownloadFileCompleted += wc_DownloadFileCompleted Wc.DownloadProgressChanged += wc_DownloadProgressChanged This will download a large image from the web, you can change the value / Download a file asynchronously in the desktop path, show the download progress and save it with the original filename. In this case we are going to use the WebClient.DownloadFileAsync method /// Usually, normally and obviously we don't want to freeze the UI and you should prefer always the asynchronous way instead (unless you have an exception in your case).
To test the snippet, just execute the downloadFile method with some action i.e a button click. String filename = System.IO.Path.GetFileName(uri.LocalPath) Private string getFilename(string hreflink)
Change the url by the value you want (a textbox or something else)Ĭlient.DownloadFile(url, desktopPath + "/" + filename) String desktopPath = Environment.GetFolderPath() / Download a file in the desktop path and save it with the original filename. The following snippet will download a file in the desktop with its original name (which is retrieven from the url with the getFilename method): /// Note that in our example we use the using statement as the WebClient implements IDisposable as a good practice. However, depends of you how are going to implement and refine the method. With the previous example you should understand how the DownloadFile method works. String myLocalFilePath = "C:/users/desktop/logo.png" Ĭlient.DownloadFile(myWebUrlFile, myLocalFilePath) Local path where the file will be saved The most easy way to download a file syncronously (will freeze the UI), thanks to the WebClient class is going to be of 5 lines : // A web URL with a file response
The WebClient is a higher-level abstraction built on top of HttpWebRequest to simplify the most common tasks.īefore continue, don't forget to add the required use statement to be able to download files using the WebClient in the top of your class: using System.Net Syncronously To achieve our task, we are going to depend of the WebClient Class of.
#Visual studio 2017 download from url with progress bar how to#
Whatever your reason is (an update feature in your application, get extra resources etc.), know how to download a file with C# is a must nowadays. There are several types of files you can download from the web : documents, pictures, videos, extensions etc.
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