如何获取类的所有实例？

Question

我的课堂知识相对较新。但是我想用powershell输出类的所有对象/实例。这有可能吗？下面是我如何创建类计算机的两个对象的示例。

Class Computer {
    [String]$Name
    [String]$Description
    [String]$Type

}

$NewComputer = New-Object 'Computer'
$NewComputer.Name = 'ultra1'
$NewComputer.Description = 'Lenovo Yoga 900'
$NewComputer.Type = 'Ultrabook' 

$NewComputer = New-Object 'Computer'
$NewComputer.Name = 'ultra2'
$NewComputer.Description = 'Lenovo Yoga X1'
$NewComputer.Type = 'Ultrabook' 

现在我想输出这两个对象，我如何做到这一点？

Answer 1

从您的评论“如果有可能获得类的对象而不将它们放入集合”，我认为您想要做的是使用类创建新的Computer对象，然后使用这些对象作为单独的变量。

为了更容易地创建，我建议您向类中添加一个构造函数，这样您就可以在一行中创建对象：

Class Computer {
    [String]$Name
    [String]$Description
    [String]$Type

    # add a constructor
    Computer(
        [string]$n,
        [string]$d,
        [string]$t
    ){
        $this.Name = $n
        $this.Description = $d
        $this.Type = $t
    }
}

# now create the computer objects
[Computer]$pcUltra1 = [Computer]::new('ultra1','Lenovo Yoga 900','Ultrabook')
[Computer]$pcUltra2 = [Computer]::new('ultra2','Lenovo Yoga X1','Ultrabook')

# show what you have now
$pcUltra1
$pcUltra2

输出：

名称描述类型

希望这有帮助

Answer 2

也许这个能帮上忙

Class Computer {
    [String]$Name
    [String]$Description
    [String]$Type

}

# a collection of computers
$computers =@()

$NewComputer = New-Object 'Computer'
$NewComputer.Name = ‘ultra1’
$NewComputer.Description = ‘Lenovo Yoga 900’
$NewComputer.Type = ‘Ultrabook’ 

# append a computer to teh collection
$computers += $NewComputer

$NewComputer = New-Object 'Computer'
$NewComputer.Name = ‘ultra2’
$NewComputer.Description = ‘Lenovo Yoga X1’
$NewComputer.Type = ‘Ultrabook’ 

# append a computer to teh collection
$computers += $NewComputer

# this outputs each of the computers
$computers

# or you can format the data in a table
$computers | Format-Table -AutoSize

# or in a list
$computers | Format-List *

# or as json
$computers | ConvertTo-Json

Answer 3

假设您没有重新绑定任何名称，则可以执行以下操作：

Get-Variable | Select-Object -ExpandProperty Value |
    Where-Object { $_.GetType().Name -eq 'Computer' }