From the author node you must first access its text node its first and only child , then the value of that text node line A in the next example. Alternately, you can use a slightly shorter expression with the InnerText property line B. One more variation uses the Select-Xml cmdlet which avoids a method call and so is, in some sense, a more distinctively PowerShell approach line C. All three lines return the same result.
Both support namespaces, which I have not mentioned yet. The two methods both take an XmlNamespaceManager as an optional second parameter, while the Select-Xml cmdlet takes an optional Namespace parameter that specifies your namespaces in a hash table. Select-Xml , on the other hand, returns a SelectXmlInfo object or an array of them and its Node property provides access to the underlying node. The example just above illustrates these differences.
Figure 2 illustrates this for the PowerShell ISE, where you get both selection choices and word completion , just like with PowerShell native tokens. NET …. Notice that all XML nodes in the document are converted to standard PowerShell properties, whether a node has children e. Which approach is better to access XML data? Table 1 helps you answer this question. The object approach is usually more concise e. XPath, however, is more expressive, in that it allows you to specify some selectors that are not possible with object notation line 7.
Thus either of these will modify the author of the 6th book:. Quite often, you might have an existing XML file where you want to change one or node values. You have seen the first two steps; the third step is done with the Save method on the XmlDocument.
Putting these all together, then, yields this basic code:. That code runs fine-except most of the time it will appear to have failed! This simple bit of code illustrates a seemingly minor but important PowerShell notion; ignorance of this has led to many blog posts claiming it is a bug in PowerShell.
The problem is that your working directory and your PowerShell location are not the same thing. The above code reads the file just fine, it modifies the data just fine, but it does not necessarily save the new file where you expect it to. The XmlDocument. If you have not executed Set-Location or its alias cd in your current PowerShell session, both point to the same directory. To confirm this, execute these two statements:. Although xpath is a world unto itself. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How to iterate through XML in Powershell? Ask Question. Asked 8 years, 4 months ago. Active 2 years, 11 months ago.
Viewed k times. Improve this question. Slogmeister Extraordinaire 2, 2 2 gold badges 23 23 silver badges 36 36 bronze badges. Mark Allison Mark Allison 6, 28 28 gold badges 93 93 silver badges bronze badges. Your XML appears to be serialized directly from in memory objects. Is there a reason you wouldn't just deserialize them back into memory? Add a comment. Active Oldest Votes. Also, make sure your email address is correct because it is used to notify you about prizes.
Last night, she told me that she wants me to help her look at the XML file she got by exporting her book database so that she can find titles of books and things like that. I think I will call her, and see if she is ready…. The Scripting Wife thought for a few seconds and began to type. Within a minute or so, she had composed the command that is shown here. The two commands and the output associated with the commands are shown in the image that follows.
Take your book element, pipe it to the Foreach-Object cmdlet, then pipe that to the Sort-Object cmdlet, and choose the DisplayName property. Then group it by DisplayName. She thought for a second, and then used the Up arrow to retrieve her previous command. She then modified it until the following command appeared. She turned the monitor to me, and the output that is shown in the image that follows was the result. Retrieve your command that lists all the titles.
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