我不知道为什么下面的循环返回空键。 我认为$ hashSorted不是Hashtable类型；所以我怎么强迫它成为？ 现在想我需要深入/副本吗？我只想对我的哈希表进行排序，然后将其放入另一个哈希表。
这可能是以下项的重复项：Sort Hashtable and assign it to a new variable in Powershell 我最初的问题是为什么循环时键为空。 然后我意识到这可能不是哈希表。仍在尝试答案。
cls
$hashFilesAndSizes = @{}
$hashSorted = @{}
$hashFilesAndSizes.Add("file1.txt",1000)
$hashFilesAndSizes.Add("file2.txt",200)
$hashFilesAndSizes.Add("file3.txt",750)
$hashFilesAndSizes.GetEnumerator() | sort value #Displays sorted hash table
Write-Host "Second Try - put in another hashtable"
$hashSorted = $hashFilesAndSizes.GetEnumerator() | sort value #put into a new variable
Write-Host "Original variable in original Order"
$hashFilesAndSizes
Write-Host "Sorted"
$hashSorted #show results
Write-Host "Why loop has null keys?"
foreach($key in $hashSorted.Keys)
{
Write-Host "Key=$key"
#if (-not ([string]::IsNullOrEmpty($key)))
#{
$keyPadded = $key.PadRight(50," ")
$fileSize = $hashSorted[$key]
$fileSizeFormatted = $fileSize.ToString("000,000")
Write-Host "$keyPadded size=$fileSizeFormatted "
#}
}
Write-Host "Test with enumerator"
foreach($item in $hashSorted.GetEnumerator())
{
$key = $hashSorted.Key
Write-Host "Key=$key"
#if (-not ([string]::IsNullOrEmpty($key)))
#{
$keyPadded = $key.PadRight(50," ")
$fileSize = $hashSorted.Value
$fileSizeFormatted = $fileSize.ToString("000,000")
Write-Host "$keyPadded size=$fileSizeFormatted "
#}
}
结果：
> Name Value
>
> ---- ----- file2.txt 200
> file3.txt 750
> file1.txt 1000
> Second Try - put in another hashtable Original variable in original
> Order file3.txt 750
> file1.txt 1000
> file2.txt 200
> Sorted file2.txt 200
> file3.txt 750
> file1.txt 1000
> Why loop has null keys? Key= You cannot call a method on a null-valued
> expression. At C:\Scripts\HashTableSortTest.ps1:23 char:37
> + $keyPadded = $key.PadRight <<<< (50," ")
> + CategoryInfo : InvalidOperation: (PadRight:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull Index operation failed; the array index evaluated to null. At
> C:\Scripts\HashTableSortTest.ps1:24 char:35
> + $fileSize = $hashSorted[ <<<< $key]
> + CategoryInfo : InvalidOperation: (:) [], RuntimeException
> + FullyQualifiedErrorId : NullArrayIndex You cannot call a method on a null-valued expression. At
> C:\Scripts\HashTableSortTest.ps1:25 char:50
> + $fileSizeFormatted = $fileSize.ToString <<<< ("000,000")
> + CategoryInfo : InvalidOperation: (ToString:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull
> size=
>Test with enumerator Key= You cannot call a method on a null-valued expression. At C:\Scripts\HashTableSortTest.ps1:38 char:37
> + $keyPadded = $key.PadRight <<<< (50," ")
> + CategoryInfo : InvalidOperation: (PadRight:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At
> C:\Scripts\HashTableSortTest.ps1:40 char:50
> + $fileSizeFormatted = $fileSize.ToString <<<< ("000,000")
> + CategoryInfo : InvalidOperation: (ToString:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull
> size= Key= You cannot call a method on a null-valued expression. At C:\Scripts\HashTableSortTest.ps1:38 char:37
> + $keyPadded = $key.PadRight <<<< (50," ")
> + CategoryInfo : InvalidOperation: (PadRight:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At
> C:\Scripts\HashTableSortTest.ps1:40 char:50
> + $fileSizeFormatted = $fileSize.ToString <<<< ("000,000")
> + CategoryInfo : InvalidOperation: (ToString:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull
> size= Key= You cannot call a method on a null-valued expression. At C:\Scripts\HashTableSortTest.ps1:38 char:37
> + $keyPadded = $key.PadRight <<<< (50," ")
> + CategoryInfo : InvalidOperation: (PadRight:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull You cannot call a method on a null-valued expression. At
> C:\Scripts\HashTableSortTest.ps1:40 char:50
> + $fileSizeFormatted = $fileSize.ToString <<<< ("000,000")
> + CategoryInfo : InvalidOperation: (ToString:String) [], RuntimeException
> + FullyQualifiedErrorId : InvokeMethodOnNull
> size=
答案 0 :(得分：3)
此
$hashSorted = $hashFilesAndSizes.GetEnumerator() | sort value
不会生成新的哈希表。相反，它将产生DictionaryEntry对象的数组。现在，由于$hashSorted实际上不是哈希表，因此没有Keys属性，并且按值索引将不起作用。要正确构造一个保留键顺序的新哈希表，您必须要做的
$hashSorted = [ordered] @{}
$hashFilesAndSizes.GetEnumerator() | sort value | foreach {$hashSorted[$_.Key] = $_.Value}
答案 1 :(得分：1)
尝试在新的清晰Powershell上下文中运行。我建议您的环境在缓存中保存一些变量。
我看到的唯一错误是在第二个循环中。您在循环内使用的是<div class="container container-margin">
<div class="columns">
<div class="column is-one-third">
<div class="card">
<div class="card-image">
<figure class="image">
<img class="bw-filter" src="/images/battleport.png"/>
</figure>
</div>
<div class="card-content remove-padding-left">
<div class="content">
<h6 class="">Battleport</h6>
<p><i>Study</i></p>
<br>
</div>
</div>
</div>
</div>
<div class="column is-one-third">
<div class="card">
<div class="card-image">
<figure class="image">
<img class="bw-filter" src="/images/crmfabriek.png"/>
</figure>
</div>
<div class="card-content remove-padding-left">
<div class="content">
<h6 class="">CRM Fabriek</h6>
<p><i>Business</i></p>
<br>
</div>
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</div>
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<div class="column is-one-thrid">
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，而不是$hashSorted。应该是：
$item编辑：顺便说一句，使用GetEnumerator（）进行排序就可以了。
编辑2： $key = $item.Key
....
$fileSize = $item.Value
为空，因为$hashSorted.Keys不是哈希表，而是键/值对的集合。
答案 2 :(得分：0)
Write-Host "Test with enumerator"
foreach($item in $hashSorted.GetEnumerator())
{
$key = $item.Key # Not $hashSorted.Key !
Write-Host "Key=$key"
#if (-not ([string]::IsNullOrEmpty($key)))
#{
$keyPadded = $key.PadRight(50," ")
$fileSize = $item.Value # Not $hashSorted.Value !
$fileSizeFormatted = $fileSize.ToString("000,000")
Write-Host "$keyPadded size=$fileSizeFormatted "
#}
}