如何使用 FluentValidation 验证文件

Question

I want to check with FluentValidation if the file I received with IFormFile has the image extension. How can I do that?

Answer 1

you can do something like this

public class FormFileValidator : AbstractValidator<IFormFile>
{
    public FormFileValidator()
    {
        RuleFor(x => x.FileName).Must(a =>a.EndsWith(".png")) // put your logic based on extension you want.
            .WithMessage("Given file is not a image type");
    }
}

and then in your controller you can validate file like this.

var result = new FormFileValidator().Validate(file);