When there are multiple invalid properties that are decorated with data annotations and validated with custom validation, I want to obtain validation results for all the invalid properties rather than just the first invalid one (as what is produced by the following code).

using MiniValidation;
using System.ComponentModel.DataAnnotations;

var widget = new Widget { Name = "A", Age = 0 };

if (!MiniValidator.TryValidate(widget, out var errors))
{
    foreach (var entry in errors)
    {
        Console.WriteLine($"  {entry.Key}:");
        foreach (var error in entry.Value)
        {
            Console.WriteLine($"  - {error}");
        }
    }
}

class Widget : IValidatableObject
{
    [Required, MinLength(3)] 
    public string Name { get; set; } = null!;
    public int Age { get; set; }
    public IEnumerable<ValidationResult> Validate(ValidationContext ctx)
    {
        if (Age < 10)
            yield return new ValidationResult("Age cannot be less than 10.", [nameof(Age)]);
    }
}

I don’t want to replace the attribute-based validations with custom validation.

class Widget : IValidatableObject
{
    public string Name { get; set; } = null!;
    public int Age { get; set; }
    public IEnumerable<ValidationResult> Validate(ValidationContext ctx)
    {
        if (Name is null)
            yield return new ValidationResult("Name must be specified.", [nameof(Name)]);
        if (Name?.Length < 3)
            yield return new ValidationResult($"{Name} must contain at least 3 characters.", [nameof(Name)]);


        if (Age < 10)
            yield return new ValidationResult("Age cannot be less than 10.", [nameof(Age)]);
    }
}