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POCreating XPS in WPF - used image files are being locked until my app quits
 

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  1. POCreating XPS in WPF - used image files are being locked until my app quits
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    <p>In my WPF app, I am creating a <code>FlowDocument</code> by building its XAML markup as a string, and then using <code>XamlReader.Parse</code> to turn the string into a <code>FlowDocument</code> object, which I then save to an XPS document file. It works.</p> <p>I needed to include an image in my document, and so to achieve this, I create and save the image as a temporary file in the temp directory, and then reference it with an absolute path in my <code>FlowDocument</code>'s XAML. This works too - during the XPS document creation process, the image actually gets embedded into the XPS document, which is great.</p> <p><strong>But the problem is, my app retains a file lock on this image until the app quits.</strong></p> <p>I am cleaning up all resources. There is NO file lock on my generated XPS file - just the image file. If I comment out the part of my code which creates the XPS file, then the image file does not get locked.</p> <p>My code (I'm on .NET 4 CP):</p> <pre><code>var xamlBuilder = new StringBuilder(); // many lines of code like this xamlBuilder.Append(...); // create and save image file // THE IMAGE AT THE PATH imageFilePath IS GETTING LOCKED // AFTER CREATING THE XPS FILE var fileName = string.Concat(Guid.NewGuid().ToString(), ".png"); var imageFilePath = string.Format("{0}{1}", Path.GetTempPath(), fileName); using (var stream = new FileStream(imageFilePath, FileMode.Create)) { var encoder = new PngBitmapEncoder(); using (var ms = new MemoryStream(myBinaryImageData)) { encoder.Frames.Add(BitmapFrame.Create(ms)); encoder.Save(stream); } stream.Close(); } // add the image to the document by absolute path xamlBuilder.AppendFormat("&lt;Paragraph&gt;&lt;Image Source=\"{0}\" ...", imageFilePath); // more lines like this xamlBuilder.Append(...); // create a FlowDocument from the built string var document = (FlowDocument) XamlReader.Parse(xamlBuilder.ToString()); // set document settings document.PageWidth = ...; ... // save to XPS file // THE XPS FILE IS NOT LOCKED. IF I LEAVE OUT THIS CODE // AND DO NOT CREATE THE XPS FILE, THEN THE IMAGE IS NOT LOCKED AT ALL using (var xpsDocument = new XpsDocument(filePath, FileAccess.ReadWrite)) { var documentWriter = XpsDocument.CreateXpsDocumentWriter(xpsDocument); documentWriter.Write(((IDocumentPaginatorSource) document).DocumentPaginator); xpsDocument.Close(); } </code></pre> <p>(Actually, the fact that's it's a dynamically generated image in the temp directory is irrelevant - this issue occurs if I hard code in the path of any image file on my machine - it will get locked.)</p> <p>One would think that there is a bug in the XPS creation code that causes the file lock.</p> <p>Is there something else I can try? Or a way to remove the file lock via code?</p>
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    1. USRoss
    1. USRoss
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    1. COI used to have the same issue. I solved it somehow. Let me see if I can find the question I asked somewhere (if I even asked it on here). I think it had something to do with freezing the image by using the `Freeze()` method.
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      1. USMathias Lykkegaard Lorenzen
    2. COIn the FlowDocument markup, I've tried adding the po:Freeze="True" attribute (with the xmlns:po declaration in root tag) - didn't work unfortunately.
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      1. USRoss
    3. COHave you tried to declare the image like this: <Image><Image.Source><BitmapImage CacheOption="None" UriSource="your path" /></Image.Source></Image>
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      1. POCreating XPS in WPF - used image files are being locked until my app quits
      1. USSimon Mourier
 

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