如何将整数数组连接成逗号分隔的字符串 [英] How to concatenate array of integers into comma separated string

问题描述

我有两个问题:

1. 如何将整数数组连接成逗号分隔的字符串?(1,2,3) => "1,2,3"
2. 如何将整数数组转换为字符串数组?(1,2,3) => ("1", "2", "3")

$arraylist = New-Object 'system.collections.arraylist'
$arraylist.Add(1);
$arraylist.Add(2);

$csv = ?? 
#($arraylist-join -',') returns error: Cannot convert value "," to type "System.Int32". Error: "Input string was not in a correct format."

推荐答案

在您的问题中，您已注释掉以下代码段:

In your question, you've commented out the following snippet:

($arraylist-join -',')

因为它返回错误 Cannot convert value "," to type "System.Int32"...

这是因为','前面的破折号-.

The reason for this is the dash - in front of ','.

在 PowerShell 中，只有 operators 和 parameters 以破折号为前缀，并且由于 ',' 两者都不是(它是一个 运算符的参数)，PowerShell 解析器变得非常困惑，并试图将 -',' 视为会导致负数的值表达式.

In PowerShell, only operators and parameters are prefixed with a dash, and since ',' is neither (it's an argument to an operator), the PowerShell parser gets super confused and tries to treat -',' as a value expression that would result in a negative number.

只要取消破折号就可以了:

Just void the dash and you'll be fine:

$arraylist -join ','

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最后，您可以使用未经检查的强制转换运算符 -as(PowerShell 3.0 和更新版本)轻松将整数数组转换为字符串数组:

---

Finally, you can easily cast an array of integers to an array of strings with the unchecked cast operator -as (PowerShell 3.0 and newer):

$StringArray = 1,2,3,4,5 -as [string[]]

或使用显式转换(PowerShell 2.0 兼容):

or with an explicit cast (PowerShell 2.0-compatible):

$StringArray = [string[]]@(1,2,3,4,5)

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