PowerShell1.0 与2.0中的异常处理比较

在PowerShell2.0中允许使用try…catch语句来进行异常处理，那么它与Trap有什么不同呢？下面简要列出：

• Trap:
  • Designed for admins
  • V1 and V2
  • Introduces a new scope
  • Is “global”, meaning it applies to all code in the same scope, before or after.
  • Does not support rethrow (an empty throw statement throws a special RuntimeException with the message “ScriptHalted”)
• Try/Catch
  • Designed for developers
  • V2 only
  • Does not introduce a new scope
  • Guarded code is in the try statement block, not the entire scope containing the try statement
  • Supports finally
  • Supports rethrowing exceptions

本文参考资料来源：http://blogs.msdn.com/b/powershell/archive/2009/06/17/traps-vs-try-catch.aspx