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POMemory Leak with XmlDocument()
 

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    <p>I believe I have memory leak with some of my code that uses the XmlDocument class.</p> <p>My program runs on a Windows 6.1.4 device (C#) and reads from a database on another server to see if any programs installed on the device need to be uninstalled and then reads from an XmlDocument to get the names of the programs that are uninstallable. The program then matches the lists and uninstalls accordingly, if necessary. This process is looped infinitely and runs in the background but what I'm noticing is that the memory creeps up slowly over time and the program eventually catches an <code>OutOfMemoryException</code>. </p> <p>If I comment out everything and do nothing in the loop, the memory stays right around 2MB consistantly. If I leave everything but the following code commented out then the memory usage goes up .05 megabytes every minute or so continuously. Those results are with having the loop sleep for 1 second. The regular sleep speed is about 10 minutes. Any thoughts as to what could be causing the leak and if it has anything to do with the XmlDocument class?</p> <pre><code>foreach (string programName in uninstallPrograms) { XmlDocument xmlDoc1 = new XmlDocument(); xmlDoc1.LoadXml("&lt;wap-provisioningdoc&gt;" + " &lt;characteristic type=\"UnInstall\"&gt;" + " &lt;characteristic type=\"" + programName + "\"&gt;" + " &lt;parm name=\"uninstall\" value=\"1\"/&gt;" + " &lt;/characteristic&gt;" + " &lt;/characteristic&gt;" + "&lt;/wap-provisioningdoc&gt;"); xmlDoc1 = ConfigurationManager.ProcessConfiguration(xmlDoc1, true); cmdStr += "DELETE FROM DEVICE_APPS WHERE ID = " + deviceAppIDList[count++] + "; "; xmlDoc1 = null; } // Check for pre-installed apps to uninstall count = 0; XmlDocument xmlDoc2 = new XmlDocument(); xmlDoc2.LoadXml("&lt;wap-provisioningdoc&gt;&lt;characteristic-query type=\"UnInstall\"/&gt;" + "&lt;/wap-provisioningdoc&gt;"); /**** The line below seems to be the cause of the memory leak ****/ //xmlDoc2 = ConfigurationManager.ProcessConfiguration(xmlDoc2, true); XmlNodeList xmlNodeList = xmlDoc2.SelectNodes("wap-provisioningdoc/" + "characteristic[@type='UnInstall']/characteristic/@type"); xmlDoc2 = null; </code></pre> <p><code>cmdStr</code> does eventually get used and is set to <code>string.Empty</code> at the end of the loop. At first I had didn't have <code>xmlDoc = null;</code> in my code but it didn't help either way. I've tried adding <code>GC.Collect();</code> at the end of my loop and that seemed to help slow down the leak but it doesn't fix it entirely. Plus I've read it's not good practice to use it anyway.</p> <p><strong>Edit:</strong> So it seems to be the ConfigurationManager line that I commented out in my code above that has the memory leak. As soon as I comment out that line of code the memory leak stops. It starts back up when I uncomment this line. Is there something I need to do after making the call to ProcessConfiguration to release the memory?</p> <p>Also, I am using the Microsoft.WindowsMobile.Configuration namespace for ConfigurationManager runtime version 1.1.4322 since System.Configuration does not exist in CF.</p>
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    1. CObtw, the moment someone adds a non-trivial programName, your code is toast; concatenating strings into xml without encoding them is hazardous - corrupt xml is certain.
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    2. COFYI. Note how I edited the code sections of your question. You only need to prefix code lines by four spaces. No need for the *pre* and *code* HTML tags.
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    3. COThat's true Marc, but the data that's populating programName is retrieved from a database, and the database is populated from the handheld itself. So yeah if the database were to become corrupted there would definitely be an issue but a bigger one at that. Thanks Inuyasha for the fix!
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