Powershell Hashtable问题

Question

我创建了一个小脚本，用于接受用户ID，名字，姓氏，然后将该数据添加到哈希表中。我遇到的问题是当我显示我的哈希表时，用户的值是System.Object。我做错了什么？

$personHash = @{}
$userID=""
$firstname=""  
$lastname=""


    While([string]::IsNullOrWhiteSpace($userID))
    {
        $userID = Read-Host "Enter ID"
    }

    While([string]::IsNullOrWhiteSpace($firstname))
    {
        $firstname = Read-Host "Enter First Name"
    }


    While([string]::IsNullOrWhiteSpace($lastname))
    {
        $lastname = Read-Host "Enter Last Name"
    }


$user = New-Object System.Object
$user | Add-Member -type NoteProperty -Name ID -value $userID
$user | Add-Member -type NoteProperty -Name First -value $firstname
$user | Add-Member -type NoteProperty -Name Last -Value $lastname
$personHash.Add($user.ID,$user)

$personHash

Answer 1

看起来当PowerShell显示哈希表的内容时，它只是在表中的对象上调用ToString。它不会像通常那样使用DefaultDisplayPropertySet格式化它们。

另一种方法是使用PSCustomObject而不是System.Object，如下所示：

$user = New-Object PSCustomObject -Property @{ ID = $userID; First = $firstname; Last = $lastname }
$personHash.Add($user.ID, $user)

然后显示将是：

Name         Value  
----         -----  
1            @{ID=1;First="Mike";Last="Z"}

Answer 2

使用[PSCustomObject]创建PowerShell知道如何呈现为字符串的类型：

$personHash = @{}
$userID=""
$firstname=""  
$lastname=""

While([string]::IsNullOrWhiteSpace($userID))
{
    $userID = Read-Host "Enter ID"
}

While([string]::IsNullOrWhiteSpace($firstname))
{
    $firstname = Read-Host "Enter First Name"
}

While([string]::IsNullOrWhiteSpace($lastname))
{
    $lastname = Read-Host "Enter Last Name"
}

$personHash[$userID] = [pscustomobject]@{ID=$userID; First=$firstname; Last=$lastname}
$personHash