调用哈希表时命令中的变量 [英] Variables in command when calling hashtable

问题描述

我正在尝试从像下面的哈希表中获取一个值.

I'm trying to fetch a value from a hashtable like the one below.

$Hashtable1AuthTestID = @{ 
    "BID_XPI" = "(id 2)";
    "MBID_XPI" = "(id 3)";
    "T_XPI" = "(id 4)";
    "ST_XPI" = "(id 5)";
    "SI_XPI" = "(id 6)";
    "T_SAML" = "(id 7)";
    "ST_SAML" = "(id 8)";
    "SI_SAML" = "(id 9)";
    "BID_SAML" = "(id 10)";
    "MBID_SAML" = "(id 11)";
}

如果我使用$Hashtable1AuthTestID.BID_XPI可以很好地工作，但是由于这将是针对几种不同类型的数据(和环境)的通用脚本，因此我在调用哈希表(例如下面的表)时希望包含多个变量.

It's working fine if I use $Hashtable1AuthTestID.BID_XPI but since this will be a generic script for several different type of data (and environments) I would like to include several variable when I call the hashtable such as the one below.

# Without variables (Example): $Hashtable1AuthTestID.BID_XPI 
# With variables (Example): $<Hashtable><Type><Environment>.<Method>

$hashtable = "Hashtable1"
$type = "Auth"
$environment = "Test"
$method = "BID_XPI"
# ID is the example is a string.

$'$hashtable1'$environment"ID".$method
$$hashtable1$environment+"ID".$method

我已经测试了几种不同的方法，但是无法使其正常工作.我确实获得了正确的语法(如果我从变量中打印出值)，例如$Hashtable1AuthTestID.BID_XPI，但是我没有从哈希表((id 2))中获得实际值.

I've tested several different approaches but can't get it working. I do get the correct syntax (if I print the values from the variables) such as $Hashtable1AuthTestID.BID_XPI but I don't get the actual value from the hashtable ((id 2)).

推荐答案

通过使用另一个变量的名称(尽管可能)引用单独命名的变量是一种错误的方法.不要这样处理这种情况的规范方法是，如果要按索引访问数据结构或对象，则使用数组:

Referencing individually named variables by using a name from another variable -although possible- is a misguided approach. Don't do it. The canonical way of dealing with situations like this is to use either an array, if you want to access the data structure or object by index:

$hashtables = @()
$hashtables += @{
    "BID_XPI"  = "(id 2)"
    "MBID_XPI" = "(id 3)"
    ...
}

$hashtables[0].MBID_XPI

或哈希表(如果要按名称访问数据结构或对象)

or a hashtable, if you want to access the data structure or object by name:

$hashtables = @{}
$hashtables['Hashtable1AuthTestID'] = @{
    "BID_XPI"  = "(id 2)"
    "MBID_XPI" = "(id 3)"
    ...
}

$hashtable   = 'Hashtable1'
$type        = 'Auth'
$environment = 'Test'
$method      = 'BID_XPI'

$name = "${hashtable}${type}${environment}ID"

$hashtables.$name.$method

---

为了完整起见，这是通过使用另一个变量中的名称来获取变量的方法，但是再次强调，不推荐.

$Hashtable1AuthTestID = @{
    "BID_XPI"  = "(id 2)"
    "MBID_XPI" = "(id 3)"
    ...
}

$hashtable   = 'Hashtable1'
$type        = 'Auth'
$environment = 'Test'
$method      = 'BID_XPI'

$name = "${hashtable}${type}${environment}ID"

(Get-Variable -Name $name -ValueOnly).$method

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