如何枚举哈希表作为键值对/按键值集合过滤哈希表 [英] How can I enumerate a hashtable as key-value pairs / filter a hashtable by a collection of key values

问题描述

^{编者注: 这个问题的历史很复杂，但可以归结为:
*要了解如何通过键值对 来枚举哈希表的条目，请参见其他答案.}

<sup>Editor's note: This question has a complicated history, but boils down to this:
* To learn how to enumerate the entries of a hashtable by its key-value pairs, see the accepted answer.
* To learn how to filter a hashtable by a collection of key values, see the other answer.</sup>

我想我又陷入了X Y问题，最初的问题是关于过滤哈希表.我发现在创建哈希表之前进行过滤比较容易.问题回答了吧?

I think I fell into the X Y problem again, my initial question was about Filtering a hash table. I discovered it's easier to filter before creating the hash table. Question answered, right?

不是，Y问题是循环每个键并使用@briantist帮助我的值.

Nope, the Y problem was looping each Key and using the Values which @briantist helped me with.

我的目标是遍历关键字名称(即时间戳)，并使用关键字名称作为任务名称和触发器来安排任务.

My goal is to loop over the key names, which are timestamps, and schedule a task using the key name as the task name and trigger.

我正在使用Group-Object -AsHashTable -AsString -edit从CSV文件创建哈希表，在这里值得一提的是，在创建HashTable之前过滤CSV仅使Pipeline或脚本上的事情变得容易 >.

I'm creating a hash table from a CSV file using Group-Object -AsHashTable -AsString -edit, it's worth mentioning here that filtering the CSV before creating the HashTable only makes things easier down the Pipeline or script.

例如:

Import-CSV (ls -path D:\ -Filter source*.csv | sort LastWriteTime | Select -Last 1).FullName |
 where {$_.TimeCorrected -ne 'ManualRebootServer'} |
 group TimeCorrected -AsHashTable -AsString

我正在尝试遍历键名，并能够使用以下命令显示键名:

I'm trying to loop over the key names and able to display the key names using:

$var = Import-Csv csv123.csv | Group-Object Value1 -AsHashTable -AsString

foreach ($key in $var.Keys){"The key name is $key"}

#Create a scheduled task named and triggered based on the HashTable keyname
#test test test
foreach ($key in $var.keys){IF($key -ne 'ManualRebootServer'){"Register-ScheduledJob"}}

我只是不确定如何从我感兴趣的键中获取值.

I'm just not sure how to get the values from the keys I am interested in.

我找到了以下作品，但仅当我手动输入密钥名称时才可以.我只是不确定如何组合两个循环.

I've found the following works, but only when I enter a Key name manually. I'm just unsure how to combine both loops.

($val.GetEnumerator() | Where {$_.key -eq '06-11-16 18:00'} | ForEach-Object { $_.value }).Server

推荐答案

您在这里有一些选择.

通过键枚举:

foreach ($key in $var.Keys) {
    $value = $var[$key]
    # or
    $value = $var.$key 
}

枚举键值对(您已经发现，但可能没有有效使用):

Enumerating key-value pairs (which you've discovered, but may not be using effectively):

foreach ($kvp in $var.GetEnumerator()) {
    $key = $kvp.Key
    $val = $kvp.Value
}

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