Скачать или смотреть How to Throw XmlSchemaException on XML Schema Validation Errors in C#

Learn how to effectively throw `XmlSchemaException` during XML Schema validation in C#. Explore practical code examples and best practices.
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This video is based on the question https://stackoverflow.com/q/155912/ asked by the user 'Neil C. Obremski' ( https://stackoverflow.com/u/9642/ ) and on the answer https://stackoverflow.com/a/155925/ provided by the user 'Micah' ( https://stackoverflow.com/u/17744/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Handling XML Schema Validation Errors in C#

XML Schema validation is a common requirement when working with XML documents, especially in software development utilizing the .NET framework. However, one of the common challenges developers face is how to appropriately handle exceptions during this validation process. Specifically, many developers seek knowledge on how to throw an XmlSchemaException when validation encounters errors.

In this guide, we will discuss how to manage XML Schema validation errors and provide a simple yet effective solution to throw an XmlSchemaException when validation fails.

Understanding the Problem

When you call the Validate() method on an XmlDocument in C#, a delegate known as ValidationEventHandler must be provided to handle validation events. This handler will have access to a ValidationEventArgs parameter, which includes the Exception property of type XmlSchemaException. Your goal is to throw this exception when an error occurs, effectively aborting the validation process.

Here’s a typical scenario:

You have an XML document.

You want to ensure it adheres to a specific schema.

If it fails validation, you want to throw an exception so that your application can handle it gracefully.

Step-by-Step Solution

1. Define the ValidationHandler

The first step is to define the ValidationEventHandler. This will be the core function that processes validation events and throws the exception when validation fails:

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

2. Invoke the Validation Method

Next, you utilize this handler when calling the Validate() method of the XmlDocument instance. Here’s how you integrate the validation handler with the XML document:

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

3. Understanding the Flow

When doc.Validate(onValidationError) is called, it starts the validation process.

If there's a validation error, the onValidationError handler is triggered.

Within this handler, the XmlSchemaException is thrown, signaling that the XML document does not conform to the defined schema.

Conclusion

In summary, handling XML schema validation errors in C# can be efficiently achieved by utilizing the ValidationEventHandler. By defining a simple handler that throws the XmlSchemaException, developers can ensure that their applications can gracefully deal with XML validation issues.

Code Example Summary

Here’s the complete code snippet encapsulating the entire process:

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

This approach allows you to focus on handling critical validation errors while ignoring warnings, aligning your application behavior with your specific requirements.

By following this structured approach, you can confidently manage XML schema validation errors and ensure that your XML documents meet all necessary standards.