- 包含运算符不工作powershell

Question

我所要做的就是看用户输入$ month是否在数组$ month中。但它不喜欢什么。帮帮我？

Write-host "The script is to collect from the user High Tempature and Low Tempature for a day in degrees F." 
$months = @("January", "February","March","April","May","June","July","August","September","October","November","December") 
$finished = $false 
while ($finished -eq $false){ 
    $month = read-host "Enter the month"; 
    if ($months -Contains $month) 
    { 
     write-host "Invalid entry" 
     $finished = $false 
    } 
    else 
    { 
     $finished = $true 
    } 
} 

Answer 1

您测试逻辑仅仅是不好的一个，只是扭转youy测试或反向您的行为：

Write-host "The script is to collect from the user High Tempature and Low Tempature for a day in degrees F." 
$months = @("January", "February","March","April","May","June","July","August","September","October","November","December") 
$finished = $false 
while ($finished -eq $false){ 
    $month = read-host "Enter the month"; 
    if ($months -Contains $month) 
    { 
     $finished = $true 
    } 
    else 
    { 
     write-host "Invalid entry" 
     $finished = $false 
    } 
} 

Answer 2

而不是使用-Contains你应该只使用-Match操作运行正则表达式匹配。或者，由于您目前正在测试否定结果，请改用-notmatch。你可以使用你现有的代码，只需修改一下你的月份和管道角色即可。如：

Write-host "The script is to collect from the user High Tempature and Low Tempature for a day in degrees F." 
$months = @("January", "February","March","April","May","June","July","August","September","October","November","December") 
$finished = $false 
while ($finished -eq $false){ 
    $month = read-host "Enter the month"; 
    if ($month -notmatch ($months -join "|")) 
    { 
     write-host "Invalid entry" 


    $finished = $false 
    } 
    else 
    { 
     $finished = $true 
    } 
} 

更好的是，让我们摆脱If/Else并缩短它。将加入移动到我们定义$Months的位置，然后询问一个月，如果它不是一个匹配，再次请求它，直到它与一个While。

$months = @("January", "February","March","April","May","June","July","August","September","October","November","December") -join '|' 
$month = read-host "Enter the month" 
While($month -notmatch $months){ 
    "Invalid Entry" 
    $month = read-host "Enter the month" 
}