Как скопировать содержимое XML-файлов из одного XML-файла в другой файл XML с помощью Powershell

Question

From below web.config file I want to copy the contents to another config file: 
<?xml version="1.0"?>  
    <configSections>...</configSections> 
    <system.webserver>...</system.webserver> 
     <configuration> 
       <appSettings> 
        <add key="ConnectionString" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
        <add key="ConnectionString1" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
        <add key="ConnectionString2" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
        <add key="key1" value ="value1"/> 
        <add key="key2" value ="value2"/> 
        <add key="key3" value ="value3"/> 
        <add key="key4" value ="value4"/> 
        .....<add key="key30" value ="value30"/> 
        </appSettings> 
      </configuration> 

Теги, которые были скопированы из выше конфигурационного файла необходимо, чтобы показать, как показано ниже ожидаемого файла конфигурации «web1.config» с следующим содержанием:

From above xml file I want to copy only "ConnectionString,ConnectionString1,ConnectionString2" tags from <appSettings> parent tag as 

<?xml version="1.0"?> 
      <appSettings> 
        <add key="ConnectionString" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
        <add key="ConnectionString1" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
        <add key="ConnectionString2" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
      </appSettings> 
      <settings> 
      <add key="key1" value ="value1"/> 
        <add key="key2" value ="value2"/> 
        <add key="key3" value ="value3"/> 
        <add key="key4" value ="value4"/> 
        .....<add key="key30" value ="value30"/> 
      </settings> 

Answer 1

сценарий извлекает ключи ConnectionString и значение из эталонного XML с использованием регулярного выражения и добавляет его в XML назначения с использованием System.Xml.XmlDocument.

$referenceXMLPath = 'c:\test1.xml' 
$destinationXMLPath = 'c:\test2.xml' 

$referenceContent = (gc $referenceXMLPath -Raw) 
$destinationContent = [xml](gc $referenceXMLPath -Raw) 

foreach ($connectionString in [regex]::Matches($referenceContent, '<add key="(ConnectionString[^"]*).*value="([^"]*)')) 
{ 
    $key = $connectionString.Groups[1].Value 
    $value = $connectionString.Groups[2].Value 

    $child = $destinationContent.CreateElement("add") 

    $keyAttribute = $destinationContent.CreateAttribute("key") 
    $keyAttribute.Value = $key 
    $child.Attributes.Append($keyAttribute) 

    $valueAttribute = $destinationContent.CreateAttribute("value") 
    $valueAttribute.Value = $value 
    $child.Attributes.Append($valueAttribute) 

    $destinationContent.configuration.appSettings.AppendChild($child) 

} 

$destinationContent.Save($destinationXMLPath) 

Answer 2

Reference Файл конфигурации:

<?xml version="1.0"?> 
<configuration> 
     <appSettings> 
      <add key="ConnectionString" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
      <add key="ConnectionString1" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
      <add key="ConnectionString2" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
      <add key="key1" value ="value1"/> 
      <add key="key2" value ="value2"/> 
      <add key="key3" value ="value3"/> 
      <add key="key4" value ="value4"/> 
      .....<add key="key5" value ="value30"/> 
      </appSettings> 
    </configuration> 

Ожидаемый конфигурационный файл:

<?xml version="1.0"?> 
    <appSettings> 
      <add key="ConnectionString" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
      <add key="ConnectionString1" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
      <add key="ConnectionString2" value=" Data Source=192.168.1.19;Network Library=DBMSSOCN;Initial Catalog=Demo;Persist Security Info=True; User ID=sa;Password=powershell;Application Name=web;Connect Timeout=200; pooling='true'; Max Pool Size=200;"/> 
    </appSettings> 
    <settings> 
    <add key="key1" value ="value1"/> 
      <add key="key2" value ="value2"/> 
      <add key="key3" value ="value3"/> 
      <add key="key4" value ="value4"/> 
      .....<add key="key5" value ="value30"/> 
    </settings>