asp.net core web api project how to with fluentvalidation auto-validation

I want to use fluentvalidation to automatically verify exceptions, but I can’t do this now. If I put the Validator in the same one project, it will work, but if I put it Validator in another library, it will not work。 The following project one

public class TestValidator : AbstractValidator<WeatherForecast>
{
    public TestValidator()
    {
        RuleFor(x => x.Summary).NotEmpty().WithMessage("Username or email are required");
    }

}

The following project two

I said that registration and verification are placed in different projects, which leads to abnormal verification.

services.AddMvc(options =>
    {
        options.Filters.Add(new ExceptionFilter());
    })
    .AddFluentValidation(options =>
    {
        options.RegisterValidatorsFromAssemblyContaining<Startup>();
    });

You need change your startup to :

 .AddFluentValidation(options =>
{
    options.RegisterValidatorsFromAssemblyContaining<TestValidator>();
});

Test result: