PowerShell调用msiexec时变量$domain无法正确传递MyDomain参数的问题求助

Let's break down why your attempts weren't working and how to resolve the variable expansion issue:

Why Your Existing Code Failed #

1. 写法1 Issue: You wrapped the entire argument string in single quotes ('...'). PowerShell does not expand variables inside single-quoted strings—so $domain was passed as a literal string instead of its actual value.
2. 写法2 Issue: The syntax for the MyDomain argument was broken. Mismatched quotes ('MyDomain='$domain'') caused a parsing error, and even if it compiled, it wouldn't properly quote the domain value for msiexec.

Correct Solutions #

Option 1: Use Double-Quoted String with Escaped Inner Quotes #

If you prefer passing a single argument string, use double quotes (to enable variable expansion) and escape inner double quotes with backticks (`):

$domain = '999-Test'
Start-Process -FilePath "$env:systemroot\system32\msiexec.exe" `
    -ArgumentList "/i `".\agent.msi`" MyServer=`"servername:8080|4344`" MyDomain=`"$domain`"" `
    -Wait

The backticks tell PowerShell to treat inner double quotes as literal parts of the argument, not as string delimiters.

Option 2: Split Arguments into an Array (Recommended) #

Splitting each msiexec parameter into a separate element in the ArgumentList array avoids quote escaping headaches and is more robust for complex arguments:

$domain = '999-Test'
Start-Process -FilePath "$env:systemroot\system32\msiexec.exe" `
    -ArgumentList @(
        '/i',
        ".\agent.msi",
        'MyServer="servername:8080|4344"',
        "MyDomain=`"$domain`""
    ) `
    -Wait

Each element is treated as a distinct argument by Start-Process. The MyDomain element uses double quotes to expand $domain, with backticks escaping the inner quotes around the domain value.

Alternative Clean Syntax for the Domain Parameter #

For better readability, construct the MyDomain parameter separately:

$domain = '999-Test'
$myDomainArg = "MyDomain=`"$domain`""

Start-Process -FilePath "$env:systemroot\system32\msiexec.exe" `
    -ArgumentList '/i', '.\agent.msi', 'MyServer="servername:8080|4344"', $myDomainArg `
    -Wait

This makes it easier to debug and modify the domain parameter independently.

Verification #

After running any of these solutions, check your MSI log to confirm MyDomain is set to the value of $domain (e.g., 999-Test) instead of the literal string $domain.

内容的提问来源于stack exchange，提问作者Xiffus