哈希表和关键订单

Question

有没有办法在添加哈希表时保持键的顺序？像推/弹机制一样.

例:

$hashtable = @{}

$hashtable.Add("Switzerland", "Bern")
$hashtable.Add("Spain", "Madrid")
$hashtable.Add("Italy", "Rome")
$hashtable.Add("Germany", "Berlin")
$hashtable

我想保留我将元素添加到哈希表的顺序.

Answer 1

PowerShell V1/V2中没有内置解决方案.您将需要使用.NET System.Collections.Specialized.OrderedDictionary:

$order = New-Object System.Collections.Specialized.OrderedDictionary
$order.Add("Switzerland", "Bern")
$order.Add("Spain", "Madrid")
$order.Add("Italy", "Rome")
$order.Add("Germany", "Berlin")


PS> $order

Name                           Value
----                           -----
Switzerland                    Bern
Spain                          Madrid
Italy                          Rome
Germany                        Berlin

在PowerShell V3中,您可以转换为[ordered]:

PS> [ordered]@{"Switzerland"="Bern"; "Spain"="Madrid"; "Italy"="Rome"; "Germany"="Berlin"}

Name                           Value
----                           -----
Switzerland                    Bern
Spain                          Madrid
Italy                          Rome
Germany                        Berlin

Answer 2

您可以使用有序字典:

像这样:

$list = New-Object System.Collections.Specialized.OrderedDictionary
$list.Add("Switzerland", "Bern")
$list.Add("Spain", "Madrid")
$list.Add("Italy", "Rome")
$list.Add("Germany", "Berlin")
$list

Answer 3

您可以在添加元素时指定一个顺序键：

$hashtable = @{}
$hashtable[$hashtable.count] = @("Switzerland", "Bern")
$hashtable[$hashtable.count] = @("Spain", "Madrid")
$hashtable[$hashtable.count] = @("Italy", "Rome")
$hashtable[$hashtable.count] = @("Germany", "Berlin")
$hashtable

然后，您可以获得按键排序的元素：

echo "`nHashtable keeping the order as they were added"
foreach($item in $hashtable.getEnumerator() | Sort Key)
{
    $item
}