如何在Powershell中检查关联数组是否为空 [英] How to check if an associative array is empty in powershell

问题描述

$a = @() 

如何检查上面的$a是否为空(是).我想得到$true作为答案.

How do I check if $a above is empty (which it is). I would like to get $true as answer.

推荐答案

这不是一个关联数组，它是一个常规数组，但是答案是相同的.使用.Count并与0比较.

That's not an associative array, it's a regular array, but the answer is the same. Use .Count and compare to 0.

关联数组在PowerShell中称为[hashtable]，其字面形式使用@{}(花括号).

An associative array is called a [hashtable] in PowerShell and its literal form uses @{} (curly braces).

@{}.Count -eq 0  # hashtable (associative array)
@().Count -eq 0  # array

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