PowerShell 工作流实战1

语法

workflow  
	{ 
 	... 
	}

例子1：

是不是觉得和function有点像呢？

关键字

和workflow相关的关键字有如下：

• Workflow
• Parallel
• Foreach –parallel
• Sequence
• InlineScript
• Checkpoint-workflow
• Suspend-workflow

例子2：

workflow paralleltest {

 parallel {

   Get-CimInstance –ClassName Win32_OperatingSystem

   Get-Process –Name PowerShell*

   Get-CimInstance –ClassName Win32_ComputerSystem

   Get-Service –Name s*

  }

}

然而，你会发现，每次运行paralleltest得出来的结果都不一样！

请记住一点，workflow是建立在.NET Framework Windows Workflow Foundation（WWF）之上的，workflow的代码是转成XAML去运行的，如下截图可以看到paralleltest的XAML的code

注意事项

在workflow中不再使用–ComputerName，而是使用 –PSComputerName代替。例如

workflow foreachtest {

   param([string[]]$computers)

   foreach –parallel ($computer in $computers){

Get-WmiObject -Class Win32_ComputerSystem -PSComputerName $computer    
Get-WmiObject –Class Win32_OperatingSystem –PSComputerName $computer

   }

}

可以按照以下方式运行：

foreachtest  -Computers “server1″, “server2″, “server3″ 

但是修改以下则结果不一样咯

workflow foreachtest2 {

   param([string[]]$computers)

   foreach –parallel ($computer in $computers){

    sequence {

      Get-WmiObject -Class Win32_ComputerSystem -PSComputerName $computer

      Get-WmiObject –Class Win32_OperatingSystem –PSComputerName $computer

    }

   }

} 

注意了，运行foreachtest "192.168.2.83","192.168.2.88"和运行foreachtest2 "192.168.2.83","192.168.2.88"的结果是不一样的。

foreachstest"192.168.2.83","192.168.2.88"的结果是每次都会变化的哦，是顺序的变化；

而foreachtest2运行的结果都是一样的

再来看个例子：

workflow foreachpsptest {


   param([string[]]$computers)


   foreach –parallel ($computer in $computers){


    sequence {


      Get-WmiObject -Class Win32_ComputerSystem -PSComputerName $computer


      Get-WmiObject –Class Win32_OperatingSystem –PSComputerName $computer


      $disks = Get-WmiObject -Class Win32_LogicalDisk -Filter "DriveType = 3" –PSComputerName $computer
	  
      foreach -parallel ($disk in $disks){


        sequence {


          $vol = Get-WmiObject -Class Win32_Volume -Filter "DriveLetter = '$($disk.DeviceID)'" –PSComputerName $computer 
          Invoke-WmiMethod -Path $($vol.__PATH) -Name DefragAnalysis
        }
      }
    }
	}
	}
  
   

例子3

在workflow中，不能直接加| format-list，如果需要加上format-list，则需要使用InlineScript

workflow foreachpitest {

   param([string[]]$computers)

   foreach –parallel ($computer in $computers){

     InlineScript {

       Get-WmiObject –Class Win32_OperatingSystem –ComputerName $using:computer |

       Format-List

     }

   }

}