Скачать или смотреть How to Loop Through a List string Using Fluent Validation in C#

Discover how to validate multiple entries in a List with Fluent Validation. Learn to loop through and check each item effectively in your C# application.
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Validating Multiple Records in C# with Fluent Validation

When working with data in C# , especially when you're dealing with complex structures like XML and objects, validation becomes an essential task to ensure the integrity of your data. If you're using Fluent Validation, a popular .NET validation library, you might encounter a situation where you need to validate multiple records in a list.

In this guide, we'll tackle this scenario, specifically focusing on how to loop through a List<string> in your validation logic using Fluent Validation. Let's break it down step-by-step.

Understanding the Problem

Imagine you have a structured XML with multiple records, and you've created corresponding C# classes to represent this data. Here’s a simplified view of your XML structure:

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

You have a corresponding C# model defined like this:

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You initially set up a validator which only checks the first record in your list:

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While this is effective for the first record, it falls short if you want to validate every record in the set.

The Solution: Using RuleForEach

To validate all records in the Record list, Fluent Validation provides a convenient method called RuleForEach. This allows you to apply validation rules to each item in a collection individually. Here's how you can implement it:

Step-by-Step Implementation

Modify your SchemaValidator Class:

Instead of targeting just the first record, use RuleForEach to apply the same validation rules to every record in the list.

SchemaValidator.cs:

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Record Validator Class:

Ensure your RecordValidator still checks the properties properly.

RecordValidator.cs:

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Validation Logic:

Use your validation logic in your program as you typically would. The Validate method remains largely unchanged:

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

Conclusion

Using RuleForEach with Fluent Validation is a clean and efficient way to validate all entries in a list. It simplifies your validation logic and ensures that each item is checked against the specified rules. With this method, you can confidently validate complex data structures in your C# applications.

If you’ve been struggling to validate multiple records in your applications, give this approach a try. Happy coding!