Question

I am coding a small script used to send emails. It accepts 3 parameters, subject, HTML body & recipient.

HTML body is being read from a file to a string. Troubles come in when HTML code contains special characters, quotes, etc., although HTML is encoded before being passed to the script. Powershell throws this error:

"The ampersand (&) character is not allowed. The & operator is reserved for future use; wrap an ampersand in double quotation marks ("&") to pass it as part of a string."

test.ps1

$theBody = Get-Content ".\welcomeMessageP1.htm" ## HTML !!!
$encodedBody = [System.Net.WebUtility]::HtmlEncode($theBody)

$command = ".\sendmail.ps1 –subject 'test email' –body '$encodedBody' -recipient 'someuser@mydomain.com' "

Invoke-Expression $command

Answer 1

Invoke-Expression is considered harmful。不要使用它。无论如何，您都不需要它。只需按原样运行命令行（当然要减去变量$encodedBody周围的引号）。

$theBody = Get-Content '.\welcomeMessageP1.htm'
$encodedBody = [Net.WebUtility]::HtmlEncode($theBody)

.\sendmail.ps1 –subject 'test email' –body $encodedBody -recipient 'someuser@mydomain.com'

Powershell escaping special characters in HTML string: Ampersand

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