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POSimplified application updating in .NET
 

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    <p>Automatically updating a desktop application seems to be a hard problem in .NET. There are a number of solutions, from microsoft's clickonce, to various open source and paid solutions. The pattern in all of these is:</p> <p>1 check remote server for version to run<br> 2 download the new version<br> 3 unpack to a temp folder<br> 4 start a shim process to replace the old files with the new after the app shuts down<br> 5 kill the running app so the shim process can begin working<br> 6 restart the main app </p> <p>This process seems to have a lot of moving parts and points of failure. However, you can write your application to be a simple loop that downloads and executes a remote dll. It seems this avoids a lot of the complexity involved in automatically updating your application, like user permissions, uac, antivirus programs, etc. </p> <p>It seems solid and futureproof to me. My app doesn't need lots of large support files, so is there a reason I shouldn't use this approach? Are there ways this can go terribly wrong? If so, how do these complexities compare to the complexities of other auto-updating solutions?</p> <p>for example:</p> <pre><code>Thread helper; int currentVersion=0; static void Main() { //dumb loop, functions as a loader while(true) { var remoteVersion = GetRemoteVersion(); if(remoteVersion &gt; currentVersion) { if(helper != null) { //kill thread gracefully :) } currentVersion = remoteVersion; byte[] bytes = GetRemoteDllAsByteArray(); var asm = Assembly.Load(bytes); var t = asm.GetType("a known type with a static method called Start()"); var mi = t.GetMethod("Start"); //run this on a helper thread outside the main loop: // the start method is the entry point to your application helper= new Thread(() =&gt; mi.Invoke(null,null)); helper.SetApartmentState(ApartmentState.STA); //for winforms/wpf helper.Start(); } Thread.Sleep(1 day);//only check for new versions once a day } } </code></pre> <p>The extra complexity in my example is you have to package all your dependencies as resources in the downloaded dll, but that can be set up as a build step, and it avoids messing with the user's filesystem. </p>
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    1. COInstead of `Thread.Sleep(1 day);`, use the Task Scheduler.
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    2. CO@dan: Okay. This is more pseudocode than code, otherwise I'd migrate to [codereview.se].
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      1. USWill
 

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