Assigning a manipulated image to asp:Image control RSS

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  d347hm4n

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  Assigning a manipulated image to asp:Image control

  Jul 11, 2011 03:02 PM|LINK

  Hello folks,

  I'm manipulating an image on the fly on my web page.

  WebClient wc = new WebClient();
          string path = Server.MapPath(@"~/Some/path/image.png");
          System.Drawing.Image bmp = System.Drawing.Image.FromFile(path,true);
          Graphics g = Graphics.FromImage(bmp);

  So I do my manipulation on G, Once I have drawn what I want to draw on my image, I save it to a file, then load that file into my image control.

  MemoryStream tempStream = new MemoryStream();
          bmp.Save(tempStream,System.Drawing.Imaging.ImageFormat.Png);
          FileStream outStream = File.OpenWrite(Server.MapPath(@"~/Some/path/image_temp.png")); tempStream.WriteTo(outStream); 
  outStream.Flush(); outStream.Close(); imgAbsRiskBar.ImageUrl = Server.MapPath(@"~/Some/path/image_temp.png");

  Unfortunately, even thought the imageurl of the image control has nothing set, and it is being set to this temporary image path it doesn't display on my page. The visibility of the control is set to true. I'm at a loss as it doens't error out, it doesn't spit it's dummy it just won't display the image.

  Any help would be greatly appreciated.

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  Menno van de...

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  Re: Assigning a manipulated image to asp:Image control

  Jul 11, 2011 07:25 PM|LINK

  Server.Mappath() maps to the local filesystem path. You appear to be assigning that path to the ImageUrl property, rather than the url.

  Menno

  • Marked as answer by d347hm4n on Jul 12, 2011 01:22 PM
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  d347hm4n

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  Re: Assigning a manipulated image to asp:Image control

  Jul 12, 2011 08:08 AM|LINK

  I want to store the images on the server, I don't want them stored on the client. That's why I'm using Server.MapPath(). Asp:Image doesn't have a "Url" property.

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  Menno van de...

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  Re: Assigning a manipulated image to asp:Image control

  Jul 12, 2011 12:04 PM|LINK

  Your image is already stored The ImageUrl property needs an url, not a local path. That's why it's ImageUrl rather than ImageFilePath.

  Menno

  • Marked as answer by d347hm4n on Jul 12, 2011 01:22 PM
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  d347hm4n

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  Re: Assigning a manipulated image to asp:Image control

  Jul 12, 2011 01:07 PM|LINK

  When I remove the Server.MapPath() and just pass in "~/images/image.png" I get a FileNotFoundException when I get Image From File.

  Probably making a beginners mistake.

  *edit* Ok, fixed it, you need the server.map path everywhere you are referring to the "FILE" if you want to assign the stored image to the image control, then you have to pass in a url.

  Thanks very much, learn something new everyday.

  • Edited by d347hm4n on Jul 12, 2011 01:23 PM
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  sudha4999

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  Re: Assigning a manipulated image to asp:Image control

  Oct 12, 2012 07:27 AM|LINK

  I am facing the same issue ... can anyone explain me what should i do to load that image to my imgurl??