PowerShell哈希表问题

Question

我正在编写一个脚本，将字母字符串转换为音素值。我遇到的问题是无法引用哈希表中的值（请参见下面的错误）。我不确定原因，因为代码在我看来很好。

Index operation failed; the array index evaluated to null.
At C:\Scripts\test.ps1:8 char:23
    + write-host $alphabet[ <<<< $char]
    + CategoryInfo          : InvalidOperation: (:) [], RuntimeException
    + FullyQualifiedErrorId : NullArrayIndex

}

参数（$string = $（throw'输入字符串'））

$alphabet = @{
"A" = "Alfa";
"B" = "Bravo ";
"C" = "Charlie ";
"D" = "Delta ";
"E" = "Echo ";
"F" = "Foxtrot ";
"G" = "Golf ";
"H" = "Hotel ";
"I" = "India ";
"J" = "Juliett";
"K" = "Kilo ";
"L" = "Lima ";
"M" = "Mike ";
"N" = "November ";
"O" = "Oscar ";
"P" = "Papa ";
"Q" = "Quebec ";
"R" = "Romeo ";
"S" = "Sierra ";
"T" = "Tango ";
"U" = "Uniform ";
"V" = "Victor ";
"W" = "Whiskey ";
"X" = "X-ray";
"Y" = "Yankee ";
"Z" = "Zulu ";
}

clear-host
$charArray = $string.ToCharArray()
foreach ($char in $charArray)
{
    write-host $alphabet[$char]
}

- SuperFurryToad

---

Alfa 应该改为 Alpha ;-) - x0n

Answer 1

每个字符都是一个丰富的对象，更改：

write-host $alphabet[$char]

为

write-host $alphabet["$char"]

或者

write-host $alphabet[$char.ToString()]

- Shay Levy

Answer 2

你的问题在于 $alphabet[$char] 中，$char 是 null。请问 $chararray 是从哪里来的？

- Gabe

---

抱歉，当我粘贴代码时，创建字符数组的那一行丢失了。现在我已经添加回去了。 - SuperFurryToad

这样行不通；$alphabet的键是字符串，而$char是一个字符。你需要使用$alphabet[$char.ToString()]，但这仍然无法解释空值来自何处。 - Gabe

$alphabet[$char.ToString()] 发挥了作用。现在它可以正常工作了，谢谢。 - SuperFurryToad

Answer 3

我认为你需要在数组中的每个字母后面去掉空格。而且，你还漏了在Alfa、Juliett（拼写有误）和X-ray后面加上一个空格。

$alphabet = @{
"A"  =  "Alfa ";
"B"  =  "Bravo ";
"C"  =  "Charlie ";
"D"  =  "Delta ";
"E"  =  "Echo ";
"F"  =  "Foxtrot ";
"G"  =  "Golf ";
"H"  =  "Hotel ";
"I"  =  "India ";
"J"  =  "Juliet ";
"K"  =  "Kilo ";
"L"  =  "Lima ";
"M"  =  "Mike ";
"N"  =  "November ";
"O"  =  "Oscar ";
"P"  =  "Papa ";
"Q"  =  "Quebec ";
"R"  =  "Romeo ";
"S"  =  "Sierra ";
"T"  =  "Tango ";
"U"  =  "Uniform ";
"V"  =  "Victor ";
"W"  =  "Whiskey ";
"X"  =  "X-ray ";
"Y"  =  "Yankee ";
"Z"  =  "Zulu ";
}

- John Kugelman

---

谢谢指出。但那是我格式化帖子时出错了。原始代码没有任何空格。 - SuperFurryToad