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    <p>I ran in to an even bigger problem along the same lines - changes to <em>any</em> file or sub-folder in the AppDomain base directory cause the hosting environment to shutdown. This is a pretty big issue for our application as we're running a WPF UI in the same AppDomain and we can't restart it without being distruptive to the user.</p> <p>I really wanted to avoid having to run a separate AppDomain for the web based part of the application so I did some digging with Reflector. I found that the culprit was the internal class <code>FileChangesMonitor</code>.</p> <p>So I wrote a horrible horrible reflection hack to solve the problem. I thought I'd post it here as a potential solution for anyone else having the same problem. You just need to call <code>HttpInternals.StopFileMonitoring()</code> to disable shutdown on file/folder changes.</p> <pre><code>internal static class HttpInternals { private static readonly FieldInfo s_TheRuntime = typeof(HttpRuntime).GetField("_theRuntime", BindingFlags.NonPublic | BindingFlags.Static); private static readonly FieldInfo s_FileChangesMonitor = typeof(HttpRuntime).GetField("_fcm", BindingFlags.NonPublic | BindingFlags.Instance); private static readonly MethodInfo s_FileChangesMonitorStop = s_FileChangesMonitor.FieldType.GetMethod("Stop", BindingFlags.NonPublic | BindingFlags.Instance); private static object HttpRuntime { get { return s_TheRuntime.GetValue(null); } } private static object FileChangesMonitor { get { return s_FileChangesMonitor.GetValue(HttpRuntime); } } public static void StopFileMonitoring() { s_FileChangesMonitorStop.Invoke(FileChangesMonitor, null); } } </code></pre>
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    1. POHow to prevent an ASP.NET application restarting when the web.config is modified?
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    1. COBut appDomains are intended to reflect the, y'know, application domain - something that is clearly different between WPF and web. You're using the object in a way not it was not intended to be used.
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    2. COThat's true, and I have indeed considered the pros and cons of using multiple AppDomains. I ended up coming to the conclusion that running multiple AppDomains would add more complexity to the application than this approach does. I'd love to hear any more opinions on the issue.
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    3. CO@Jacob Stanley: First of all thanks for this solution. I have only one question, how can I restore file monitoring? For example after updating some dll files manually I want to restore normal website behaviour.
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