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POFile being used by another process even if closed it before
 

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    <p>I don't understand why the same code runs successfully on a 32-bit system, but trying to run it on a 64-bit system, always gives an error:</p> <blockquote> <p>File being used by another process</p> </blockquote> <p>I declare a file watcher event to watching a file changed. </p> <p>My code is similar to below:</p> <pre><code>static void Main() { //init load file LoadAssembly(dll); //bind watching event. FileSystemWatcher watcher = new FileSystemWatcher(rootPath, "*.dll"); watcher.NotifyFilter = NotifyFilters.CreationTime | NotifyFilters.LastWrite; watcher.Changed += new FileSystemEventHandler(TemplateFile_Changed); watcher.IncludeSubdirectories = false; watcher.EnableRaisingEvents = true; } private LoadAssembly(assemblyFile) { try { using (FileStream fs = new FileStream(assemblyFile, FileMode.Open, FileAccess.Read, FileShare.Read)) { //read a file and write to memorystream. ...... fs.Close(); fs.Dispose(); } asm = Assembly.Load(ms.ToArray()); } finally { ms.Close(); } } private void TemplateFile_Changed(object sender, FileSystemEventArgs e) { lock (_sync) { LoadAssembly(e.FullPath); } } </code></pre> <p>I test code that can work in 32-bit system(in my computer). When I deployed to 64-bit system, when I change a file and tell application need to re-load this file ,that always get a</p> <blockquote> <p>File being used by another process`</p> </blockquote> <p>at</p> <pre><code>using (FileStream fs = new FileStream(assemblyFile, FileMode.Open, FileAccess.Read, FileShare.Read)) </code></pre> <p>updated-1</p> <p>Well,thanks @Hans Passant answered,this exception it's looks caused by the file watcher that fired a changed event and still keep file open. I add a Thread.Sleep() in my TemplateFile_Changed looks solved this problem.</p> <pre><code>private void TemplateFile_Changed(object sender, FileSystemEventArgs e) { lock (_sync) { Thread.Sleep(2000); LoadAssembly(e.FullPath); } } </code></pre>
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    1. USzhengchun
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    1. COwhat is `ms` variable?
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      1. USMajid
    2. COThis exception is entirely normal. When the Changed event fires, the program that's changing the file still has the file opened. It is *busy* making changes, it isn't done with it. You'll have to wait. How long that takes is unpredictable, it depends on how long that other program keeps the file opened.
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      1. USHans Passant
    3. COIs it possible this other system has anti-virus software that will automatically scan changed files? They are notorious for causing these kinds of issues.
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      1. USmike z
 

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