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POHow do I get WPF's DocumentViewer to release its file lock on the source XPS Document?
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  1. POHow do I get WPF's DocumentViewer to release its file lock on the source XPS Document?
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    copied!<p>After showing an XPS file in the WPF DocumentViewer, and closing the DocumentViewer instance, the XPS file is locked and I cannot delete it. I need to release the lock on the XPS file so I can delete it, write another one with the same name, and optionally display that new XPS file in a new DocumentViewer instance. I need to do this in the same app instance - without having to close the app (this is a Print Preview scenario).</p> <p>In other words, how would I get the following code to run without throwing an exception at the "File.Delete(tempXpsFile);" statement?</p> <pre><code>var tempXpsFile = @"c:\path\to\Temporary.xps"; var previewWindow = new Window(); var docViewer = new DocumentViewer(); previewWindow.Content = docViewer; GenerateXpsFile(tempXpsFile); var xpsDocument = new XpsDocument(tempXpsFile); previewWindow.ShowDialog(); File.Delete(tempXpsFile); //this will throw an exception due to a file lock on tempXpsFile GenerateXpsFile(tempXpsFile); //assume this generates a different file //otherwise the scenario doesn't make sense as we could just skip the above delete //and this statement and re-use the same file previewWindow = new Window(); docViewer = new DocumentViewer(); previewWindow.Content = docViewer; previewWindow.ShowDialog(); </code></pre> <p>Closing the app does release the file lock, as mentioned in <a href="https://stackoverflow.com/questions/283027/wpf-documentviewer-doesnt-release-the-xps-file">WPF DocumentViewer doesn&#39;t release the XPS file</a>, but that is not an option in this scenario.</p>
 

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