PowerShell-有没有一种方法可以创建一种包含多个ValidateSet参数的“别名”？

Question

下午好,

param(
    [string]$script = "help",
    [ValidateSet("localhost", "Server1", "Server2")]
    [string]$server,
    [ValidateSet("DC0_C0", "DC0_C1", "DC0_C2", "Customer1")]
    [string[]]$cluster,
    [switch]$help
)

./viexec vminfo localhost Cluster1,Cluster3,Cluster10

./viexec vminfo localhost Customer1 #And have the script run automatically on all the right clusters.

问候你，亚历桑德罗

Answer 1

以下是基于JSON的答案的一个变体：

>

根据请求使用CSV文件作为数据源。

显示了一个更简单的组合制表符完成和验证解决方案，其基础是将一个实现System.Management.Automation.IValidateSetValuesGenerator接口的类传递给ValidateSet属性（感谢地改编自此答案），但请注意，它需要PowerShell(Core)7+。

首先，创建一个包含2个客户及其关联集群的示例CSV文件：

# Create a sample CSV file that maps customer names to clusters.
# This will serve as the basis for tab-completion / argument validation.
# IMPORTANT: Be sure that you have enough headers (colum names) to cover 
#            the maximum number of columns values.
@'
Customer,Cluster1,Cluster2,Cluster3,Cluster4,Cluster5
Customer1,DC0_C0,DC0_C1,DC0_C2
Customer2,DC1_C0,DC1_C1
'@ > CustomersToClusters.csv

在此基础上构建的代码：

# Parse the CSV file, assumed to be located in the same dir.
# as this script.
$csvRows = Import-Csv $PSScriptRoot/CustomersToClusters.csv

# Build a hashtable of customer names mapped to their associated clusters.
$colCount = $csvRows[0].psobject.Properties.Name.Count
$htCustomersToClusters = [ordered] @{}
foreach ($row in $csvRows) {
  $htCustomersToClusters[$row.Customer] = $row.psobject.Properties.Value[1..($colCount-1)] -ne $null
}
# Build an array of all customer and cluster names.
[string[]] $allCustomersAndClusters = $htCustomersToClusters.Keys + $htCustomersToClusters.GetEnumerator().ForEach({ $_.Value })

# Define the custom class that implements the System.Management.Automation.IValidateSetValuesGenerator
# interface, to be passed to the [ValidateSet()] attribute.
class CustomerAndClusters : System.Management.Automation.IValidateSetValuesGenerator {
  [string[]] GetValidValues() { return $script:allCustomersAndClusters }
}

function Invoke-VI {
  param(
    # Provide tab-completion and validation based on the values
    # returned by a [CustomersAndClusters] instance's .GetValidValues() call.
    [ValidateSet([CustomerAndClusters])]
    [string[]] $Cluster
  )

  # Resolve the specified cluster arguments and remove duplicates from the
  # resulting list of cluster-only names.
  $resolvedClusters = $Cluster | ForEach-Object {
    # If a customer name was specified, resolve it to the list of associated clusters.
    if ($customerClusters = $htCustomersToClusters[$_]) { $customerClusters }
    else { $_ }
  } | Select-Object -Unique
  
  "Specified or implied clusters: $resolvedClusters"

}