使用命令调用Powershell时如何充分抑制错误？

Question

I'm trying to write an msbuild postbuild event that will copy a file. It need not be 100% - the destination file might be used or locked in which case I would like the build to succeed.

so I have something like*

PowerShell -NoProfile -ExecutionPolicy Bypass -Command "cp foo `$(TargetDir)"

when $(TargetDir)\\foo is used by another process I get an error and my build fails. So I try

PowerShell -NoProfile -ExecutionPolicy Bypass -Command "cp foo `$(TargetDir) -ErrorAction SilentlyContinue"

yet the error is printed and it fails. So I try

PowerShell -NoProfile -ExecutionPolicy Bypass -Command "try { cp foo `$(TargetDir) } catch {}"

and now the error is not printed yet it STILL fails because if I execute the above $LastExitCode still equals 1.

I can wrap yet again in try catch and powershell but how do I suppress the error correctly?

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*The actual command is the following - not that it matters

PowerShell -NoProfile -ExecutionPolicy Bypass -Command `"try { ls '`$(SolutionDir)\packages\GhostScriptSharp.*\Tools\gsdll32.dll' | Sort -Descending | Select -First 1 | cp -Destination '`$(TargetDir)' } catch {}`""

Answer 1

您可以使用exit关键字来显式设置脚本的退出代码：

PowerShell -NoProfile -ExecutionPolicy Bypass -Command "cp foo `$(TargetDir) -ErrorAction SilentlyContinue; exit 0"