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How do I programmatically download a file from a specified URL?

Posted on 2008-10-03
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Last Modified: 2013-11-12
Hi Experts

I am looking for a snippet of code that will allow me to programmatically download a zip or xml file from a specified URL on the web. The code will have to work from a WPF program, so it is windows based. The URL and file will be on a domain that I administrate, so I will have full read/write access to the file. I will also want to save the file to a folder on the local C-drive.
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Question by:Fritz41
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Accepted Solution

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Jaime Olivares earned 200 total points
Comment Utility
use the System.Net.WebClient class, like:

System.Net.WebClient Client = new System.Net.WebClient ();
Client.DownloadFile("http://www.yourdomain.com/yourfile.zip", @"c:\somefolder\yourfile.zip");
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Expert Comment

by:esesjay4
Comment Utility
Using a stream is the easiest and safest way to read a file on a client machine.  Hope this code helps:

Using Microsoft.Win32;

Using System.IO;
 
 

// Put this section of code in your function
 

/************ BEGIN ******************************************/

OpenFileDialog openDialog = new OpenFileDialog();
 

// Setup your file filters here

openDialog.Filter = "Text Files (*.txt)|*.txt|All files (*.*)|*.*";
 

// Variable that stores your file data

string fileData;
 

if (openDialog.ShowDialog() == true)

{

	using (Stream fileStream = openDialog.OpenFile())

	{

		int numBytesToRead = (int)fileStream.Length;

		byte[] bytes = new byte[numBytesToRead];

		int numBytesRead = 0;

		while (numBytesToRead > 0)

		{

			int n = fileStream.Read(bytes, numBytesRead, numBytesToRead);

			if (n == 0)

				break;
 

			numBytesRead += n;

			numBytesToRead -= n;

		}

		fileStream.Close();
 

                  // This variable has your file data.

		fileData = Encoding.ASCII.GetString(bytes);

	}

}
 

/************ END ******************************************/

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Expert Comment

by:esesjay4
Comment Utility
whoops...my code requires the user to actually select the file.  So this might not work for you...sorry.
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Author Closing Comment

by:Fritz41
Comment Utility
Thanks, this seems like exactly what I was looking for.
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