What are the different validation methods in C# and how do they compare?

What are the different validation methods in C# and how do they compare?

In C#, common validation methods include Data Annotations, IValidatableObject, and custom validation logic. Data Annotations are simple and declarative, while IValidatableObject allows for more complex validation scenarios. Custom validation gives you full control but requires more code.

Can you explain how Data Annotations work?

Data Annotations are attributes you can apply to model properties to enforce validation rules. For example, using [Required] ensures a property must have a value, while [StringLength] can limit the length of a string.

What are the pros and cons of using IValidatableObject?

The main advantage of IValidatableObject is that it allows for complex validation that involves multiple properties. However, it can make your models more complex and harder to maintain.

How do custom validation methods differ from the built-in ones?

Custom validation methods provide flexibility to implement any logic you need, unlike built-in methods which are limited to predefined rules. However, they require more effort to implement and test.