How can I implement validation in ASP.NET Core?

How can I implement validation in ASP.NET Core?

You can implement validation in ASP.NET Core using data annotations or by creating custom validation attributes.

What are data annotations?

Data annotations are attributes you can apply to model properties to enforce validation rules, like [Required] or [StringLength].

Can you give me an example of using data annotations?

Sure! For example, you can use [Required] on a property to ensure it must have a value: public string Name { get; set; } [Required].

What if I need more complex validation?

For complex validation, you can create custom validation attributes by inheriting from ValidationAttribute and overriding the IsValid method.