C# downloading file

This example shows how to download files from any website to local disk. The simply way how to download file is to use WebClient class and its method DownloadFile. However, there is a built-in way of asynchronously downloading a file and reporting progress with the WebClient class, as demonstrated in the example below.

The above code is very similar to the synchronous example. The DownloadProgressChanged event is fired periodically as the download progresses and provides access to some useful properties such as BytesReceived and ProgressPercentage. As expected, the DownloadFileCompleted event is fired whenever the file download has completed.

As it stands, the above code will continue past the DownloadFileAsync method call while the download is in progress, since it is an asynchronous method call. In order to download the file asynchronously using the DownloadFileAsync method and wait until the download has completed before continuing program execution, we need to dip into the world of reset events. The AutoResetEvent in the above code allows us to wait at the point where the WaitOne method is called.

When the DownloadFileCompleted event is fired, the Set method on the AutoResetEvent sends a signal that allows the code to proceed to the next statement. Note that the use of AutoResetEvent as shown above, is a neat little trick that can be applied to any other asynchronous methods you want to call and subsequently wait for completion. Although the above example works, there is a cleaner way to achieve the same result, providing you are targeting. NET Framework 4. NET Core 2. NET Standard 2.

Viewed 40 times. Combine directory. FullName, "temp. Now:dd-MM-yyyy HH:mm:ss. ReportProgress args. Set ; webClient. DownloadFileAsync new Uri url , zipFile. FullName ; autoResetEvent. Improve this question. Why is this a Best practice? Daniel for example register in ConfigureServices: services. GetExtension path. Does this copy the entire file in the memory or only a part of the file which is being transferred? Toprak Toprak 6 6 silver badges 7 7 bronze badges. TryGetContentType Path.

Tim Gerhard Tim Gerhard 2, 2 2 gold badges 16 16 silver badges 37 37 bronze badges. This reads the whole file into memory. Not suitable for bigger files or bigger server load. Sign up or log in Sign up using Google.

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