Question

我有一个XML文件，如下所示

<xml xmlns="http://schemas.microsoft.com/wix/2006/wi">
<Product>


<Feature Id="f1" Absent="qqq"  Title="test" Level="1">

  <ComponentGroupRef Id="ComponentGroupRef1" />
  <ComponentGroupRef Id="ComponentGroupRef2" />
  <ComponentGroupRef Id="ComponentGroupRef3" />
  <ComponentGroupRef Id="ComponentGroupRef4" />
  <ComponentGroupRef Id="WindowsFolder1" />
  <ComponentGroupRef Id="ComponentGroupRef5" />
  <ComponentGroupRef Id="ComponentGroupRef6" />
  <ComponentGroupRef Id="ComponentGroupRef7" />
  <Feature Id="f2"  Display="hidden">
    <ComponentRef Id="Component1" />
  </Feature>
 <FeatureGroupRef Id ="fg1"/>
</Feature>

       </Product>

</xml>

需要在第一个功能标记功能ID = f1之间添加元素。我要添加的元素格式如下所示

<ComponentGroupRef Id="Mycomponentname" />.

生成的xml应如下所示

<Feature Id="f1" Absent="qqq"  Title="test" Level="1">

  <ComponentGroupRef Id="ComponentGroupRef1" />
  <ComponentGroupRef Id="ComponentGroupRef2" />
  <ComponentGroupRef Id="ComponentGroupRef3" />
  <ComponentGroupRef Id="ComponentGroupRef4" />
  <ComponentGroupRef Id="WindowsFolder1" />
  <ComponentGroupRef Id="ComponentGroupRef5" />
  <ComponentGroupRef Id="ComponentGroupRef6" />
  <ComponentGroupRef Id="ComponentGroupRef7" />
  <ComponentGroupRef Id="Mycomponentname" />
  <Feature Id="f2"  Display="hidden">
    <ComponentRef Id="Component1" />
  </Feature>
 <FeatureGroupRef Id ="fg1"/>
</Feature>

       </Product>

</xml>

我尝试使用以下代码添加元素，但它失败了

$filePath="C:\Filename.xml"
[xml]$doc=Get-Content $filePath
$x= $doc.CreateElement("ComponentGroupRef")
$x.SetAttribute('id','Mycomponentname')
$doc.Product.Feature.AppendChild($x)

我在最后一行代码中得到的错误在下面给出

You cannot call a method on a null-valued expression.

Answer 1

不要忘记xml标记。

$filePath="C:\Filename.xml"
[xml]$doc=Get-Content $filePath
$x= $doc.CreateElement("ComponentGroupRef", $doc.xml.Product.NamespaceURI)
$x.SetAttribute('id','Mycomponentname')
$doc.xml.Product.Feature.AppendChild($x)

一个注意事项是，因为它被附加，它将在fg1之后显示在最后。像这样：

<xml xmlns="http://schemas.microsoft.com/wix/2006/wi">
  <Product>
    <Feature Id="f1" Absent="qqq" Title="test" Level="1">
      <ComponentGroupRef Id="ComponentGroupRef1" />
      <ComponentGroupRef Id="ComponentGroupRef2" />
      <ComponentGroupRef Id="ComponentGroupRef3" />
      <ComponentGroupRef Id="ComponentGroupRef4" />
      <ComponentGroupRef Id="WindowsFolder1" />
      <ComponentGroupRef Id="ComponentGroupRef5" />
      <ComponentGroupRef Id="ComponentGroupRef6" />
      <ComponentGroupRef Id="ComponentGroupRef7" />
      <Feature Id="f2" Display="hidden">
        <ComponentRef Id="Component1" />
      </Feature>
      <FeatureGroupRef Id="fg1" />
      <ComponentGroupRef id="Mycomponentname" />
    </Feature>
  </Product>
</xml>

使用powershell将新元素添加到xml

1 个答案: