Question

参考Replace placeholders with actual values in PowerShell dictionary 我试图用实际元素值dynamically替换PowerShell字典中的占位符。我从上面的帖子中得到了一个合适的答案，但这并没有多大帮助，因为它是一个静态的解决方案。需求经常变化，所以我不能在PowerShell脚本中硬编码。我对PowerShell脚本进行了一些更改并尝试运行。但是遇到了一些错误。以下是我的代码：

$xmldata = @"
<configuration>
    <environment id="Development">
    <type>Dev</type>
    <client>Arizona%%type%%</client>
    <dataSource>Local%%client%%</dataSource>
    <path>App_Data\%%type%%\%%client%%_%%dataSource%%</path>
    <targetmachines>
        <targetmachine>
        <name>Any</name>
        <remotedirectory>D:\Inetpub\Test</remotedirectory>
        </targetmachine>
    </targetmachines>
    </environment>
</configuration>
"@

[System.Xml.XmlDocument] $configxml = [xml]$xmldata
$environmentId = "Development"
$keyValuePairs = New-Object "System.Collections.Generic.Dictionary``2[System.String,System.String]"
$configxml.SelectNodes("//configuration/environment[@id='$($environmentId)']//*[not(*)]") | `
    ForEach-Object {
                    if($_.ParentNode.ToString() -ne "targetmachine")
                    {

                        $keyValuePairs.Add($_.Name, $_.InnerText)
                    }
                }

Write-Output $keyValuePairs

Foreach ($key in $keyValuePairs.Keys)
{

    $strings = [regex]::Matches($keyValuePairs[$key], '%%([^/)]+?)%%') |ForEach-Object { $_.Groups[1].Value }
    $strings = $strings | sort -unique

    if ($strings.Count -gt 0)
    {
        $finalValue = $keyValuePairs[$key]
        $finalValue

        foreach ($placeholder in $strings)
        {
            write-host "one of the place holder is" -ForegroundColor Green
            $placeholder
            #replacing all of the placeholders (which exists between %%---%%) with actual values
            $finalValue = $finalValue.Replace("%%$placeholder%%",$keyValuePairs[$placeholder])
        }

        #Replace the original value with actual value
        $keyValuePairs[$key] = $finalValue 
    }
}

Write-Output $keyValuePairs

尝试覆盖字典值时出现以下错误

Collection was modified; enumeration operation may not execute.
At line:33 char:10
+ Foreach ($key in $keyValuePairs.Keys)
+          ~~~~
    + CategoryInfo          : OperationStopped: (:) [], InvalidOperationExcept 
   ion
    + FullyQualifiedErrorId : System.InvalidOperationException

注意：基本上我尝试使用动态方法替换字典值中的占位符。有人可以帮助我如何实现以下输出

Key                        Value
---                        -----
type                       Dev
client                     ArizonaDev
dataSource                 LocalArizonaDev
path                       App_Data\Dev\ArizonaDev_LocalArizonaDev

Answer 1

对于给定的xml数据集，以下脚本应按预期工作。对于更复杂的嵌套占位符结构，请参阅### loop while ...条评论（并考虑一下）。

$xmldata = @" <configuration> <environment id="Development"> <type>Dev</type> <client>Arizona%%type%%</client> <dataSource>Local%%client%%</dataSource> <path>App_Data\%%type%%\%%client%%_%%dataSource%%</path> <targetmachines> <targetmachine> <name>Any</name> <remotedirectory>D:\Inetpub\Test</remotedirectory> </targetmachine> </targetmachines> </environment> </configuration> "@ [System.Xml.XmlDocument] $configxml = [xml]$xmldata $environmentId = "Development" $keyValuePairs = New-Object "System.Collections.Generic.Dictionary``2[System.String,System.String]" $configxml.SelectNodes("//configuration/environment[@id='$($environmentId)']//*[not(*)]") | ` ForEach-Object { if($_.ParentNode.ToString() -ne "targetmachine") { $keyValuePairs.Add($_.Name, $_.InnerText) } } "BEFORE---->" Write-Output $keyValuePairs | ft -AutoSize -Wrap ### loop while [Regex]::Matches($keyValuePairs.path,"%%(.+?)%%*") START $aux = $($keyValuePairs.GetEnumerator()) for ($i=0; $i -lt $aux.Count; $i++) { $auxKey = $aux[$i].Key $auxVal = $aux[$i].Value $m = [Regex]::Matches($keyValuePairs.path,"%%(.+?)%%*") $m | % { $tag = $_.Groups[1].Value if ( $tag -match '%%') { # wait until replaced } else { $keyValuePairs.$auxKey = $keyValuePairs.$auxKey -replace "%%$tag%%", $($keyValuePairs.$tag) $aux = $($keyValuePairs.GetEnumerator()) # renew values after replace } } } ### loop while [Regex]::Matches($keyValuePairs.path,"%%(.+?)%%*") END "AFTER---->" Write-Output $keyValuePairs | ft -AutoSize -Wrap

<强>输出：

PS D:\PShell> D:\PShell\SO\42687374.ps1 BEFORE----> Key Value --- ----- type Dev client Arizona%%type%% dataSource Local%%client%% path App_Data\%%type%%\%%client%%_%%dataSource%% AFTER----> Key Value --- ----- type Dev client ArizonaDev dataSource LocalArizonaDev path App_Data\Dev\ArizonaDev_LocalArizonaDev

Answer 2

=IF(F4>0, "Should Save", IF(F4<0, "Owed", ""))

使用动态方法替换PowerShell字典中的占位符

2 个答案: