CODEWITHSUNDEEP
c#progress-barwebclientfilesize
Jan Tacci
Jan Tacci

Reputation: 3211

How To Get The Size Of A File (Hosted On A Web Server)?

I am using the WebClient class to download an .exe file from a web server. Here is the code I am using to download the file:

WebClient webClient = new WebClient();    
webClient.DownloadProgressChanged += new DownloadProgressChangedEventHandler(webClient_DownloadProgressChanged);
webClient.DownloadDataAsync(new Uri("http://www.blah.com/calc.exe"));

My application has a ProgressBar which gets updated in the callback (webClient_DownloadProgressChanged):

private void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
    progressBar.Value = (int)e.BytesReceived;
}

The problem I am having is I have to set the Maximum value for the progress bar dynamically. In other words I need to know the size of the file I am downloading before the download starts.

Is there a way to get the size of a file (before downloading it) given it's uri?

Upvotes: 3

Views: 3688

Answers (3)

chiper
chiper

Reputation: 239

If you only need to update progress bar correctly, the easiest way is to use ProgressPercentage

// progressBar.Max is always set to 100
progressBar.Value = e.ProgressPercentage;

Upvotes: 2

Arun Kumar K S
Arun Kumar K S

Reputation: 442

Try to set max size to e.TotalBytesToReceive like this 

private void webClient_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
{
     progressBar.Max = (int)e.TotalBytesToReceive;
    progressBar.Value = (int)e.BytesReceived;

}

Upvotes: 5

Eric Herlitz
Eric Herlitz

Reputation: 26307

One of the ways will be checking for the Content-Length or the Range header in ResponseHeaders.

// To set the range
//webClient.Headers.Add("Range","bytes=-128");

// To read Content-Length
var bytes = Convert.ToInt64(webClient.ResponseHeaders["Content-Length"]);

Upvotes: 2

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