What are the differences between data annotations and fluent validation?

What are the differences between data annotations and fluent validation?

Data annotations are attributes you can apply to model properties for validation, while fluent validation uses a more expressive syntax.

Can you give me examples of both?

Sure! For data annotations, you might use [Required] or [StringLength(100)]. For fluent validation, you would write: RuleFor(x => x.Name).NotEmpty().Length(0, 100);.

Which one is better for complex validation scenarios?

Fluent validation is generally better for complex scenarios as it allows for more flexibility and readability.

Are there any performance differences between the two?

Performance differences are usually negligible, but fluent validation can be more efficient in complex cases due to its chaining capabilities.