C# webclient check download file

NET Framework 4. NET Core 2. NET Standard 2. By using the await keyword when calling the DownloadFileTaskAsync method, the code will wait until the file download has completed, while at the same time carrying out the download asynchronously and firing the progress events.

Note that whatever method you use the above code within needs to be marked with the async keyword. Before attempting to use the HttpClient class, make sure you have the appropriate using statement in place, as follows. Note that even though HttpClient implements IDisposable it is recommended that you create one instance of HttpClient and reuse this throughout your program to avoid problems such as socket exhaustion. As you can see from the above example, the code required to download a file using HttpClient is a little lower level compared to using WebClient , since we need to work with streams directly.

Nonetheless, the code is still straightforward to follow along with. Note that as per the previous example, whatever method you use the above code within needs to be marked with the async keyword. For any new development work, it is recommended that you use HttpClient.

It has a number of advantages over WebClient , including more configuration options and it facilitates easier mocking and testing. However, it does have some disadvantages, such as the lack of built-in progress reporting.

In this article, I have covered the two main ways of downloading files using C and the. WebClient makes it really easy to download files, with its high-level API and it is available regardless of what.

NET version you are targeting. Try flushing with localStream. It downloads to a local file the resource with the specified URI. Also this method does not block the calling thread.

Check for a network connection using GetIsNetworkAvailable to avoid creating empty files when not connected to a network.

This event is raised each time an asynchronous file download operation completes. Asynchronous file downloads are started by calling the DownloadFileAsync methods.

The AsyncCompletedEventHandler is the delegate for this event. The AsyncCompletedEventArgs class provides the event handler with event data. For more information about how to handle events, see Handling and Raising Events.

Web Client. Please rate your experience Yes No. Any additional feedback? Namespace: System. Net Assembly: System. DownloadFileAsync Uri, String. Note This member outputs trace information when you enable network tracing in your application. Applies to. Is this page helpful? In this article.