Creating Image object using System.Drawing.Image.FromFile

Question

I am trying to get the image dimensions of an image that user selects from list box. Image files are available on FTP server. I am displaying file names in a list box for users to select. Upon selection, I want to show the preview of image, for that I want to get dimensions so that I can resize it if i need to.

I am storing file name that is linked to currently selected list item into a string variable. I know that path on the server. I am using following code to create the Image object, but having no luck

try
{
     string dir = Session["currentUser"].ToString();
     System.Drawing.Image img = System.Drawing.Image.FromFile("~/Uploads/"+dir+"/"+fName, true);     //ERROR here, it gives me file URL as error message!
}
catch(Exception ex)
{
     lbl_Err.Text = ex.Message;
}

Not sure what is going wrong. Any ideas?

So, what do you need? Do you get any exceptions, wrong values or don't you know how to get the values? — Andy
– Andy, Commented Apr 9, 2013 at 8:35
I'm not into asp.net, is something starting with ~ a valid path? — nvoigt
– nvoigt, Commented Apr 9, 2013 at 8:35
FromFile requires the filename, so I am giving a relative path (absolute path throws another error), but in exception it throws System.IO.FileNotFoundException and the message property of ex is "~/Uploads/anemailtes/flower.png" — user1889838
– user1889838, Commented Apr 9, 2013 at 8:41

Community · Accepted Answer · 2017-05-23 12:00:50Z

10

use Server.MapPath to fetch the image from the server.
As follows

System.Drawing.Image img = 
      System.Drawing.Image.FromFile(Server.MapPath("Uploads/"+dir+"/"+fName), true);

You can use following as well

Server.MapPath(".") returns the current physical directory of the file (e.g. aspx) being executed
Server.MapPath("..") returns the parent directory
Server.MapPath("~") returns the physical path to the root of the application
Server.MapPath("/") returns the physical path to the root of the domain name (is not necessarily the same as the root of the application)

References
Server.MapPath("."), Server.MapPath("~"), Server.MapPath(@"\"), Server.MapPath("/"). What is the difference?

edited May 23, 2017 at 12:00

CommunityBot

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answered Apr 9, 2013 at 8:37

शेखर

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3 Comments

user1889838 Over a year ago

thanks, it worked. Could you explain, because it gave me error when i used server.mappath earlier (must be used in-correctly )

Vel Over a year ago

Hi शेखर, How to get the image url in that From File method. For Ex: photos-public-domain.com/wp-content/uploads/2012/08/…

शेखर Over a year ago

@Vel you need to use web request

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