Скачать или смотреть How to Fix XML Document Value Retrieval Issues in C#

Learn how to successfully retrieve data from an XML document in C# with this easy-to-follow guide on correcting namespace and selection errors.
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This video is based on the question https://stackoverflow.com/q/62387074/ asked by the user 'thealamezon' ( https://stackoverflow.com/u/13403797/ ) and on the answer https://stackoverflow.com/a/62387704/ provided by the user 'Mohammed Sajid' ( https://stackoverflow.com/u/1745795/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Fix XML Document Value Retrieval Issues in C#

When working with XML documents in C# , you might run into a frustrating issue where your code fails to retrieve data from your XML file. You may find yourself facing a scenario where you expect to see a value like Aram, but instead, your console outputs nothing. If this is your case, don't worry! In this guide, we'll walk through the common pitfalls in handling XML documents and how to fix them step by step.

Understanding the Problem

In the question posed, the user had an XML document structured like this:

[[See Video to Reveal this Text or Code Snippet]]

The user attempted to retrieve the <xsl:Name> value using the following C# code:

[[See Video to Reveal this Text or Code Snippet]]

The output was nothing instead of Aram. Let's solve this issue by addressing three specific mistakes in the user's approach.

Step-by-Step Solution

1. Correct the Namespace

The first mistake lies in the XML namespace being added to the XmlNamespaceManager. The user has mistakenly used rate instead of xsl. Here's how to adjust it:

[[See Video to Reveal this Text or Code Snippet]]

2. Update the XPath Expression

Next, the XPath expression used in the SelectNodes method needs to reflect the correct structure and the xsl namespace. The correct way to access the name would be:

[[See Video to Reveal this Text or Code Snippet]]

3. Display the Value Correctly

Finally, the original code was using var for the item in the foreach loop. This doesn't allow direct access to the inner value of the XmlNode. Change it to explicitly use XmlNode and leverage InnerText to get the content. Here’s the corrected code snippet:

[[See Video to Reveal this Text or Code Snippet]]

Complete Solution Code

Once all the changes have been implemented, the complete code should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Expected Result

Upon executing the corrected code, you should see Aram printed in the console as expected:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By carefully reviewing your namespace definitions, XPath queries, and output methods, you can easily resolve issues related to data retrieval from XML documents in C# . These adjustments not only help fix the immediate issue but also lay a solid foundation for better XML handling in your C# applications. Happy coding!