测试以查看Powershell中是否存在计划任务 [英] Testing to see if a scheduled task exist in powershell

问题描述

我不知道为什么下面的代码行不通:

I can't figure out why the below code won't work:

Function createFirefoxTask() {
   $schedule = new-object -com Schedule.Service 
   $schedule.connect() 
   $tasks = $schedule.getfolder("\").gettasks(0)

   foreach ($task in ($tasks | select Name)) {
      echo "TASK: $task.name"
      if($task.equals("FirefoxMaint")) {
         write-output "$task already exists"
         break
      }
   }
} 
createFirefoxTask

我得到的输出是这样:

FirefoxMaint                                                                          

TASK: @{Name=FirefoxMaint}.name
TASK: @{Name=Task1}.name
TASK: @{Name=Task2}.name
TASK: @{Name=Task3}.name
TASK: @{Name=Task4}.name
TASK: @{Name=Task5}.name

如果我在不通过脚本的情况下从外壳中回显$task.name，它将正确显示名称.

If I echo $task.name from the shell without going through the script, it properly displays the name.

推荐答案

在双引号字符串中使用时，变量求值将在标点处停止.您可以使用$()表示字符串中的子表达式，如下所示:

When used in a double-quoted string, variable evaluation will stop at punctuation. You can use $() to denote a subexpression within a string, like this:

"TASK: $($task.name)"

然后，PowerShell将计算括号内的表达式并使用结果扩展字符串

PowerShell will then evaluate the expression inside the parentheses and expand the string with the outcome

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