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POImage caching issue by using files in ASP.NET
 

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  1. POImage caching issue by using files in ASP.NET
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    <p>I am facing a problem with Image caching by using files in ASP.NET. My detailed solution is:</p> <ul> <li><p>For 1st request: I check the image file not exists and write the image file into hard disk. After that returns the url of the file to the browser</p></li> <li><p>For later requests: the function just returns the url of the file to the browser</p></li> </ul> <p>My problem is: sometimes with 1st requests, the browser can not get the image data from the url and cause the 404 - File Not Found error. I think it might because of the file is written but not ready for retrieving from browsers, but in the code I am using both "using statement" and "Dispose method" for bitmap &amp; graphic objects to ensure everything are ready for accessing from browsers.</p> <p>In more details, I am using the similar solution as in NopCommerce:</p> <pre><code>lock (s_lock) { ........... using (var stream = new MemoryStream(LoadPictureBinary(picture))) { using(var b = new Bitmap(stream)){ using(var newBitMap = new Bitmap(newSize.Width, newSize.Height)){ ....................... newBitMap.Save( Path.Combine(this.LocalThumbImagePath, localFilename), ici, ep); } } } } // end lock return url; </code></pre> <p>More information: you can check the full code at <a href="http://nopcommerce.codeplex.com/SourceControl/changeset/view/9125b9a7fafe#src%2fLibraries%2fNop.Services%2fMedia%2fPictureService.cs" rel="nofollow">http://nopcommerce.codeplex.com/SourceControl/changeset/view/9125b9a7fafe#src%2fLibraries%2fNop.Services%2fMedia%2fPictureService.cs</a> (please search the GetPictureUrl() function)</p>
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    1. USHoa Tran
    1. USHoa Tran
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    1. CO"returns the url of the file to the browser" - is it 302 redirect? Or you "1st request" means request to some other page, not to the image?
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      1. USAlexei Levenkov
    2. COYou didn't post enough code to diagnose why the first request returns a URL that has no image ready. The bug you're asking about is in the code you snipped out. That said, you have a major threading bug here as mentioned in @Aristos's answer.
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      1. POImage caching issue by using files in ASP.NET
      1. USChris Moschini
    3. COHi Chris, I added the link to the full source code in the question. Please review it when you have time. Thanks in advance.
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      1. USHoa Tran
 

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