Validation filter to automatically return BadRequest respones for invalid models and IsEqualToAttribute for comparing Password and ConfirmPasswords in models

ApiModelStateValidationFilter.cs

using System;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Filters;

namespace Filters
{
    public class ApiModelStateValidationFilter : IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext context)
        {
            if (!context.ModelState.IsValid && context.HttpContext.Request.Path.StartsWithSegments("/Api", StringComparison.OrdinalIgnoreCase))
            {
                var apiErrorResult = new ApiResponse<object>(new ApiError(context.ModelState));
                context.Result = new BadRequestObjectResult(apiErrorResult);
            }
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
            // Not doing anything after the action has executed
        }
    }
}

IsEqualToAttribute.cs

using System.ComponentModel.DataAnnotations;
using System.Reflection;

namespace Attributes
{
    public class IsEqualToAttribute : ValidationAttribute
    {
        public IsEqualToAttribute(string compareTo)
        {
            _compareTo = compareTo;
        }

        public override bool RequiresValidationContext => true;

        private readonly string _compareTo;

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var validationPartner = validationContext.ObjectInstance.GetType().GetTypeInfo().GetProperty(_compareTo).GetValue(validationContext.ObjectInstance);
            return validationPartner?.Equals(value) == true
                ? ValidationResult.Success
                : new ValidationResult($"The property is expected to be equal to \"{_compareTo}\".");
        }
    }
}