在Powershell中,如何重载数组运算符的索引?
这是我现在正在做的事情:
class ThreeArray {
$myArray = @(1, 2, 3)
[int] getValue ($index) {
return $this.myArray[$index]
}
setValue ($index, $value) {
$this.myArray[$index] = $value
}
}
$myThreeArray = New-Object ThreeArray
Write-Host $myThreeArray.getValue(1) # 2
$myThreeArray.setValue(2, 5)
Write-Host $myThreeArray.getValue(2) # 5
而且,我想这样做:
$myThreeArray = New-Object ThreeArray
Write-Host $myThreeArray[1] # 2
$myThreeArray[2] = 5
Write-Host $myThreeArray[2] # 5
那么,如何对数组的索引进行运算符重载呢?
这有可能吗?
Thanks!
最简单的方法是从System.Collections.ObjectModel.Collection<T> https://learn.microsoft.com/en-us/dotnet/api/system.collections.objectmodel.collection-1
class ThreeArray : System.Collections.ObjectModel.Collection[string]
{
ThreeArray() : base([System.Collections.Generic.List[string]](1, 2, 3)) {}
}
展示:
$myThreeArray = [ThreeArray]::new() # same as: New-Object ThreeArray
$myThreeArray[1] # print the 2nd element
$myThreeArray[2] = 5 # modify the 3rd element...
$myThreeArray[2] # and print it
'--- all elements:'
$myThreeArray # print all elmements
上面的结果是:
2
5
--- all elements:
1
2
5
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