如何使用powershell检查节点是否存在而不会出现异常? [英] How to check whether a node exists or not using powershell without getting exception?

问题描述

我正在尝试检查特定节点是否存在，如下所示.

I am trying to check whether a particular node exists or not like follows.

在我的配置文件中有一个名为 client 的节点，它可能可用也可能不可用.

In my config file there is a node named client ,it may or may not available.

如果它不可用，我必须添加它.

If it is not available i have to add it.

    $xmldata = [xml](Get-Content $webConfig)    

        $xpath="//configuration/system.serviceModel"    
        $FullSearchStr= Select-XML -XML $xmldata -XPath $xpath

If ( $FullSearchStr -ne $null) {  

        #Add client node
        $client = $xmldata.CreateElement('Client')
        $client.set_InnerXML("$ClientNode")
        $xmldata.configuration."system.serviceModel".AppendChild($client) 
        $xmldata.Save($webConfig) 

    }

我正在检查的条件可能会返回数组.

The condition i am checking may return array.

我想检查客户端节点之前是否可用?

i would like to check whether the client node available before or not?

推荐答案

为什么你不能这样做:

$xmldata = [xml](Get-Content $webConfig)    
$FullSearchStr = $xmldata.configuration.'system.serviceModel'    

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