创建和引发新异常

若要调用特定异常(如 FileNotFoundException) ，请使用此格式

if (-not (Test-Path $file))
{
throw [System.IO.FileNotFoundException] "$file not found."
}

若要引发常规异常，请使用 throw 命令后跟字符串。

throw "Error trying to do a task"

当在 catch 内部使用时，可以提供有关是什么触发了错误的附加信息

可以通过扩展 Exception 类引发自己的自定义错误。

class CustomException : Exception {
[string] $additionalData


CustomException($Message, $additionalData) : base($Message) {
$this.additionalData = $additionalData
}
}


try {
throw [CustomException]::new('Error message', 'Extra data')
} catch [CustomException] {
# NOTE: To access your custom exception you must use $_.Exception
Write-Output $_.Exception.additionalData


# This will produce the error message: Didn't catch it the second time
throw [CustomException]::new("Didn't catch it the second time", 'Extra data')
}