如何在 PowerShell 中测试变量是否超过八个字符? [英] How can I test that a variable is more than eight characters in PowerShell?

问题描述

如何测试$dbUserName中的字符数是否超过8个字符?

How do test if the number of characters in $dbUserName is more than eight characters?

我一直无法找到可以让我执行此操作的命令或一系列命令.我只能找到变量是否为空:

I have been unable to locate a command or series of commands that will let me do this. I have only been able to find if the variable is null:

if ($dbUserName) {
    Write-Output " You left Username blank"
    $dbUserName = read-host
}

但我想像这样进行下一个测试:

But I would like to next test like this:

if ($dbUserName [String] > 8 ) }
    Write-Output " Please enter more than 8 characters "
    $dbUserName=read-host " Re-enter database user name"
}

推荐答案

使用[String]类型的length属性:

if ($dbUserName.length -gt 8) {
    Write-Output "Please enter more than 8 characters."
    $dbUserName = Read-Host "Re-enter database username"
}

请注意，您必须在 if 条件中使用 -gt 而不是 >.PowerShell 使用以下比较运算符来比较值和测试条件:

Please note that you have to use -gt instead of > in your if condition. PowerShell uses the following comparison operators to compare values and test conditions:

• -eq = 等于
• -ne = 不等于
• -lt = 小于
• -gt = 大于
• -le = 小于或等于
• -ge = 大于或等于

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