C# prompt download file

GetAsync "api. Improve this question. Add a comment. Active Oldest Votes. Improve this answer. Andrea Beggiato Andrea Beggiato 2 2 silver badges 4 4 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Menu: Homepage Contact. Download Files from Web [C ] This example shows how to download files from any website to local disk.

Download File Synchronously The following code shows how to download file synchronously. First of all, make sure you have the appropriate using statement in place, as follows. This is needed in order to use the WebClient class without requiring a fully qualified namespace. The WebClient class itself is really easy to use. The very simplest example of downloading a file is as follows. The DownloadFile method accepts a URL to download a file from and a local file path to download the file to.

All of the above happens synchronously i. Unfortunately, the DownloadFile method does not provide a way of reporting progress, as it is a synchronous method. 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. In order to download a file, we make an HTTP Get request, then read the response content into a memory stream which can be copied to a physical file.

If you are interested, you might want to read my other articles: File Upload via Swagger , Upload Files with Angular and. Again, the full solution for this article is in my GitHub repository. I hope you have learned something new. Thanks for reading. Senior Application Developer. I write blogs about. Bursts of code to power through your day.

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