如何添加csproj的Propertygroup？

Question

我们正在为我们所有的csproject做延迟签名。打开每个csproject文件来完成这项任务非常耗时，因此我决定编写一个PowerShell脚本。

function New-XMLNode 
{ 
    [CmdletBinding()] 
    [OutputType([string])] 
    Param 
    (
     # webconfig file full path 
     [Parameter(Mandatory=$true, 
        ValueFromPipelineByPropertyName=$true, 
        Position=0)] 
     [string]$Path, 
     [string] $xPath,    
     [string] $node,    
     [string] $LogFile = "$Env:Temp\NewXMLNode.log" 
    ) 

     try 
     {    
      if (-not (Test-Path -Path $Path)) 
      { 
        throw [System.IO.FileNotFoundException] "$Path not found." 
      } 
      Else 
      { 

       $xml = New-Object -TypeName XML 
       $xml.Load($Path)       


       # Getting all the values 
       $Items = Select-Xml -XML $xml -XPath $xPath 
       If ($Items -ne $null) # If xpath is valid 
       { 
        ForEach ($Item in $Items) 
        {  
         [System.Xml.XmlDocumentFragment] $newnode = $xml.CreateDocumentFragment() 
         $newnode.InnerXml = $node 
         $Item.Node.AppendChild($newnode) 
        } 
       } 
       else # if xpath is not valid then log the error 
       { 
        Write "$(Get-Date -Format $DateTimeFormat) ## ERROR ## $($MyInvocation.MyCommand.Name) ## Given xpath $xpath for xml $Path is not valid" | Out-File $LogFile -Append 
       } 
       $xml.Save($Path) 
      } 
     } 
     catch 
     { 
      Write $_.Exception.ErrorRecord | Out-File -FilePath $LogFile -Append 
      throw "$(Get-Date -Format $DateTimeFormat) ## ERROR ## $($MyInvocation.MyCommand.Name) ## $_ " 
     } 
} 

Function Set-StrongNameSign 
{ 
    Param 
    (
     $Path="M:\MyProject\MyProject.csproj" 
    ) 

     $ns = @{ dns = "http://schemas.microsoft.com/developer/msbuild/2003" } 

    New-XMLNode -Path $Path -xPath "/$ns:Project" -node '<PropertyGroup> 
    <SignAssembly>true</SignAssembly> 
    </PropertyGroup>' 
} 

Set-StrongNameSign 

当运行这个我得到以下错误。

## ERROR ## New-XMLNode ## Exception calling "AppendChild" with "1" argument(s): 
"This document already has a 'DocumentElement' node." 
At line:51 char:13 
+    throw "$(Get-Date -Format $DateTimeFormat) ## ERROR ## $($MyInvocati ... 
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 
    + CategoryInfo   : OperationStopped: (02/26/2016 11:1...lement' node." :String) [], RuntimeException 
    + FullyQualifiedErrorId : 02/26/2016 11:17:33 ## ERROR ## New-XMLNode ## Exception calling "AppendChild" with "1" argument(s): "This document already has a 'DocumentElement' node."

如何解决这个问题？我需要添加更多的propertygroup和一个Itemgroup。

Answer 1

尝试添加名称空间前缀映射为你的函数的另一个参数，说$namespaces，并在你的XPath使用已注册的前缀：

function New-XMLNode 
{ 
    ..... 
    # Getting all the values 
    $Items = Select-Xml -XML $xml -XPath $xPath -Namespace $namespaces 
    ...... 
} 

Function Set-StrongNameSign 
{ 
    Param 
    (
     $Path="M:\MyProject\MyProject.csproj" 
    ) 

    $ns = @{ dns = "http://schemas.microsoft.com/developer/msbuild/2003" } 

    # use the registered prefix `dns` in the XPath and pass the mapping as parameter : 
    New-XMLNode -Path $Path -xPath "/dns:Project" -namespaces $ns -node '<PropertyGroup> 
    <SignAssembly>true</SignAssembly> 
    </PropertyGroup>' 
}