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Question

我可以创建一个类似于$x = Get-Process的引用，然后可以使用$x进行调用。太好了，每次我键入$x时，过程都会更新，但是对于我正在做的事情，我并不希望如此。我想在某个时间点捕获过程的快照，然后能够查询该捕获点在该时间点的所有属性。

因此，我正在寻找一种声明$x的方法，以便在调用时收集所有内容，然后在我引用$ x时，它包含该时间点的历史值，而无需重新处理Get-Process。我该怎么办？

Answer 1

看起来您想要的是克隆对象。
为此，有一种简单的方法:$y = $x | Select-Object *，但这并不总是足够的，因为它将使您的副本很浅。

为了能够进行深拷贝，您可以尝试以下功能:

function Clone-Object ([object]$obj, [switch]$DeepClone) {
    if ($DeepClone) {
        # create a deep-clone of an object
        # test if the object implements the IsSerializable Interface
        if ([bool]($obj.GetType().IsSerializable)) {      # or: if ([bool]($obj.GetType().Attributes -band 'Serializable')) {
            $ms = New-Object System.IO.MemoryStream
            $bf = New-Object System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
            $bf.Serialize($ms, $obj)
            $ms.Position = 0
            $clone = $bf.Deserialize($ms)
            $ms.Close()
        }
        else {
            # try PSSerializer that serializes to CliXml
            # source: https://stackoverflow.com/a/32854619/9898643
            try {
                $clixml = [System.Management.Automation.PSSerializer]::Serialize($obj, 100)
                $clone  = [System.Management.Automation.PSSerializer]::Deserialize($clixml)
            }
            catch {
                Write-Error "Could not Deep-Clone object of type $($obj.GetType().FullName)"
            }
        }
    }
    else {
        # create a shallow copy of the same type
        # if the object has a Clone() method
        if ($obj -is [System.ICloneable]) {
            $clone = $obj.Clone()
        }
        # test if the object implements the IEnumerable Interface
        elseif ($obj -is [System.Collections.IEnumerable]) {
            try {
                # this only works for objects that have a parameter-less constructor
                $clone = New-Object -TypeName $($obj.GetType().FullName) -ErrorAction Stop
                foreach ($pair in $obj.GetEnumerator()) { $clone[$pair.Key] = $pair.Value }
            }
            catch {
                Write-Error "Could not Clone object of type $($obj.GetType().FullName)"
            }        
        }
        # not Cloneable, not Enumerable..
        else {
            # this returns an object with the properties copied, 
            # but it is NOT OF THE SAME TYPE as the source object
            $clone = $obj | Select-Object *
        }
    }

    return $clone
}

像这样使用它:

$y = Clone-Object $x -DeepClone

希望能有所帮助