如何使（$ Line_1`n $ Line_2）在CMD脚本中工作？

显然$Line_1 + "`n" + $Line_2和"$Line_1`n$Line_2"正常工作。通过旧的怪癖从cmd向PowerShell发送命令字符串是很棘手的，因为：

• cmd()中的特殊字符表示一个块
• 令牌的分隔符不仅<space>和<tab>也; , = <0x0B> <0x0C>和<0xFF>

PowerShell将命令放在最后一个参数的单个字符串中，因此您需要引用整个内容或转义所有定界符。最简单的解决方案是使用单行并"`n"像这样转义引号

PowerShell "Add-Type -AssemblyName System.Windows.Forms; $Line_1 = 'Hello!'; $Line_2 = 'How are you?'; [System.Windows.Forms.MessageBox]::Show($Line_1 + \"`n\" + $Line_2)"

如果要将命令放在多行中，则不能用引号引起来。现在要将整个内容作为单个参数，您需要转义所有空格（;在这种情况下，您无需转义，这可能是因为在将命令行传递给PowerShell之后，它会GetCommandLineW再次调用并解析整个事物本身）

PowerShell Add-Type^ -AssemblyName^ System.Windows.Forms;^
$Line_1^ =^ 'Hello!';^
$Line_2^ =^ 'How^ are^ you?';^
[Windows.Forms.MessageBox]::Show($Line_1^ +^ \"`n\"^ +^ $Line_2)"

另外，您可以"`n"通过直接获取新行来避免该字符串[char]10

PowerShell -Command Add-Type -AssemblyName System.Windows.Forms;^
$Line_1 = 'Hello!';^
$Line_2 = 'How are you?';^
[System.Windows.Forms.MessageBox]::Show($Line_1 + [char]10 + $Line_2)

最终，一种无需任何转义即可工作的解决方案，它利用EncodedCommandPowerShell的选项来接收UTF-16命令字符串的base64编码的字符串。您可以通过在PowerShell中运行此代码来获取编码版本

$str = @'
>> Add-Type -AssemblyName System.Windows.Forms;
>> $Line_1 = 'Hello!';
>> $Line_2 = 'How are you?';
>> [System.Windows.Forms.MessageBox]::Show($Line_1 + "`n" + $Line_2)
>> '@
PS C:\Users\phucl> [Convert]::ToBase64String([Text.Encoding]::Unicode.GetBytes($str))
QQBkAGQALQBUAHkAcABlACAALQBBAHMAcwBlAG0AYgBsAHkATgBhAG0AZQAgAFMAeQBzAHQAZQBtAC4AVwBpAG4AZABvAHcAcwAuAEYAbwByAG0AcwA7AAoAIAA9ACAAJwBIAGUAbABsAG8AIQAnADsACgAgAD0AIAAnAEgAbwB3ACAAYQByAGUAIAB5AG8AdQA/ACcAOwAKAFsAUwB5AHMAdABlAG0ALgBXAGkAbgBkAG8AdwBzAC4ARgBvAHIAbQBzAC4ATQBlAHMAcwBhAGcAZQBCAG8AeABdADoAOgBTAGgAbwB3ACgAIAArACAAIgAKACIAIAArACAAKQA=

拥有编码版本后，您可以从cmd调用它

PowerShell -EncodedCommand QQBkAGQALQBUAHkAcABlACAALQBBAHMAcwBlAG0AYgBsAHkATgBhAG0AZQAgAFMAeQBzAHQAZQBtAC4AVwBpAG4AZABvAHcAcwAuAEYAbwByAG0AcwA7AAoAJABMAGkAbgBlAF8AMQAgAD0AIAAnAEgAZQBsAGwAbwAhACcAOwAKACQATABpAG4AZQBfADIAIAA9ACAAJwBIAG8AdwAgAGEAcgBlACAAeQBvAHUAPwAnADsACgBbAFMAeQBzAHQAZQBtAC4AVwBpAG4AZABvAHcAcwAuAEYAbwByAG0AcwAuAE0AZQBzAHMAYQBnAGUAQgBvAHgAXQA6ADoAUwBoAG8AdwAoACQATABpAG4AZQBfADEAIAArACAAIgBgAG4AIgAgACsAIAAkAEwAaQBuAGUAXwAyACkA