不要通过PowerShell命令

Question

我有一个要求运行时节点下的条目的XML文件（以红色突出显示）添加相同的条目上的xml：

我能够通过以下PowerShell来实现这一目标脚本

$appFrameContainerAppConfig = 'D:\H.Infrastructure.AppFrame.Container.exe.config' 
$doc = (Get-Content $appFrameContainerAppConfig) -as [Xml] 

$root = $doc.get_DocumentElement() 

$newDependentAssembly = $doc.CreateElement("dependentAssembly") 

$newAssemblyIdentity = $doc.CreateElement("assemblyIdentity") 
$newAssemblyIdentity.SetAttribute("name","EntityFramework") 
$newAssemblyIdentity.SetAttribute("publicKeyToken","b77a5c561934e089") 
$newAssemblyIdentity.SetAttribute("culture","neutral") 
$newDependentAssembly.AppendChild($newAssemblyIdentity) 

$newCodeBase = $doc.CreateElement("codeBase") 
$newCodeBase.SetAttribute("version","6.0.0.0") 
$newCodeBase.SetAttribute("href","EntityFramework_6.1.3/EntityFramework.dll") 
$newDependentAssembly.AppendChild($newCodeBase) 

$root.runtime.assemblyBinding.AppendChild($newDependentAssembly) 

$newDependentAssembly = $doc.CreateElement("dependentAssembly") 

$newAssemblyIdentity = $doc.CreateElement("assemblyIdentity") 
$newAssemblyIdentity.SetAttribute("name","EntityFramework.SqlServer") 
$newAssemblyIdentity.SetAttribute("publicKeyToken","b77a5c561934e089") 
$newAssemblyIdentity.SetAttribute("culture","neutral") 
$newDependentAssembly.AppendChild($newAssemblyIdentity) 

$newCodeBase = $doc.CreateElement("codeBase") 
$newCodeBase.SetAttribute("version","6.0.0.0") 
$newCodeBase.SetAttribute("href","EntityFramework_6.1.3/EntityFramework.SqlServer.dll") 
$newDependentAssembly.AppendChild($newCodeBase) 

$root.runtime.assemblyBinding.AppendChild($newDependentAssembly) 

$newDependentAssembly = $doc.CreateElement("dependentAssembly") 

$newAssemblyIdentity = $doc.CreateElement("assemblyIdentity") 
$newAssemblyIdentity.SetAttribute("name","System.Data.SQLite") 
$newAssemblyIdentity.SetAttribute("publicKeyToken","db937bc2d44ff139") 
$newAssemblyIdentity.SetAttribute("culture","neutral") 
$newDependentAssembly.AppendChild($newAssemblyIdentity) 

$newCodeBase = $doc.CreateElement("codeBase") 
$newCodeBase.SetAttribute("version","1.0.98.0") 
$newCodeBase.SetAttribute("href","SQLite_1.0.98.1/System.Data.SQLite.dll") 
$newDependentAssembly.AppendChild($newCodeBase) 

$root.runtime.assemblyBinding.AppendChild($newDependentAssembly) 

$newDependentAssembly = $doc.CreateElement("dependentAssembly") 

$newAssemblyIdentity = $doc.CreateElement("assemblyIdentity") 
$newAssemblyIdentity.SetAttribute("name","System.Data.SQLite.EF6") 
$newAssemblyIdentity.SetAttribute("publicKeyToken","db937bc2d44ff139") 
$newAssemblyIdentity.SetAttribute("culture","neutral") 
$newDependentAssembly.AppendChild($newAssemblyIdentity) 

$newCodeBase = $doc.CreateElement("codeBase") 
$newCodeBase.SetAttribute("version","1.0.98.0") 
$newCodeBase.SetAttribute("href","SQLite_1.0.98.1/System.Data.SQLite.EF6.dll") 
$newDependentAssembly.AppendChild($newCodeBase) 

$root.runtime.assemblyBinding.AppendChild($newDependentAssembly) 

$newDependentAssembly = $doc.CreateElement("dependentAssembly") 

$newAssemblyIdentity = $doc.CreateElement("assemblyIdentity") 
$newAssemblyIdentity.SetAttribute("name","System.Data.SQLite.Linq") 
$newAssemblyIdentity.SetAttribute("publicKeyToken","db937bc2d44ff139") 
$newAssemblyIdentity.SetAttribute("culture","neutral") 
$newDependentAssembly.AppendChild($newAssemblyIdentity) 

$newCodeBase = $doc.CreateElement("codeBase") 
$newCodeBase.SetAttribute("version","1.0.98.0") 
$newCodeBase.SetAttribute("href","SQLite_1.0.98.1/System.Data.SQLite.Linq.dll") 
$newDependentAssembly.AppendChild($newCodeBase) 

$root.runtime.assemblyBinding.AppendChild($newDependentAssembly) 
Write-Output $root.runtime.assemblyBinding.dependentAssembly 
$doc.Save($appFrameContainerAppConfig) 

我需要其评估如果条目以红色突出显示存在于XML若然避免添加相同的条件。

if($root.SelectNodes('//configuration/runtime/assemblyBinding/dependentAssembly/assemblyIdentity[@name="EntityFramework"]')) { 
} else { 
} 

我在这里使用的条件似乎不起作用。它不会进入内部，如果或条件。有什么建议么？

Answer 1

检查<runtime>节点是否已包含条目，例如，像这样：

if ($root.SelectNodes('//runtime/dependentAssembly').Count -eq 0) { 
    ... 
} 

如果您需要更细粒度的检查，请调整XPath expression。

编辑：显然你的XML数据使用的命名空间，所以你需要有一个命名空间选择节点命名空间管理：

$nsm = New-Object System.Xml.XmlNamespaceManager($doc.NameTable) 
$nsm.AddNamespace('ns', 'urn:schemas-microsoft-com:asm.v1') 
if ($doc.SelectNodes('//ns:assemblyBinding/dependentAssembly/assemblyIdentity[@name="EntityFramework"]', $nsm).Count -eq 0) { 
    ... 
}