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POWhat exactly does System.Diagnostics.Process UseShellExecute do?
 

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  1. POWhat exactly does System.Diagnostics.Process UseShellExecute do?
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    <p>I have an MSBuild task that executes (among other things) a call to xcopy. What I have found is that this call to xcopy executes correctly when I run my MSBuild task from a batch file, and fails to execute or produce any output that would allow me any idea what is going on when that same batch file is called from another C# application with a System.Diagnostics.Process.</p> <p>Both processes are launched with more or less the same structure:</p> <pre><code>waitProc.StartInfo.Arguments = "/C [executable]"; waitProc.StartInfo.FileName = "cmd.exe"; waitProc.StartInfo.UseShellExecute = false; </code></pre> <p>Furthermore by changing the "UseShellExecute" from false to true on the xcopy command I can make this succeed in both use cases, however the command fails to run in a third use case. The third use case being our automated build system which is a windows service calling msbuild directly. In the case of the failure on our build machine the copy command hangs indefinitely which is, I believe, because the System.Diagnostics.Process tries to display a window, and services do not have a Windows desktop session associated with them, so they cannot display windows.</p> <p>I have tried using the "CreateNoWindow" property, and I've tried setting the "WindowStyle" to "ProcessWindowStyle.Hidden," but that does not change the behavior on the build machine.</p> <p>All of this said, what I really want to know is what exactly the UseShellExecute property does, because it seems to do a whole lot more than the MSDN documentation suggests.</p> <p>Thanks.</p>
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    1. USLuke Puplett
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      1. USMichael Petrotta
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    1. COHi Chris, did you ever get any further with this? I seem to be encountering a similar situation: http://stackoverflow.com/questions/7085185/msbuild-buildinparallel-custom-task-spawning-process-that-fails-to-run
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      1. USTom Hunter
 

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