FluentValidation NotNull on enum values

I have a model with enum property which based on 'int'. I need to validate that this property is not empty. But NotEmpty forbids 0 value. And NotNull just doesn't work because enum property cannot be null. I cannot make my property nullable. How can I do such validation?

As long as the enum type is int you can do the following:

public class Status
    {
        public StatusType type { get; set; }
    }

    public enum StatusType
    {
        open = 1,
        closed = 2
    }

    public class StatusValidator : AbstractValidator<Status>
    {
        public StatusValidator()
        {
            RuleFor(x => x.type).Must(x => x != 0);
        }

    }

If you can't avoid 0 you can define a workaround for the model as follow (source: Choosing the default value of an Enum type without having to change values):

[Note: you need to include using System.ComponentModel;]

public class Status
{
    public StatusType type { get; set; }
}

[DefaultValue(_default)]
public enum StatusType
{
    _default = -1,
    test = 0,
    open = 1,
    closed = 2,

}

public static class Utilities
{
    public static TEnum GetDefaultValue<TEnum>() where TEnum : struct
    {
        Type t = typeof(TEnum);
        DefaultValueAttribute[] attributes = (DefaultValueAttribute[])t.GetCustomAttributes(typeof(DefaultValueAttribute), false);
        if (attributes != null &&
            attributes.Length > 0)
        {
            return (TEnum)attributes[0].Value;
        }
        else
        {
            return default(TEnum);
        }
    }
}

public class StatusValidator : AbstractValidator<Status>
{
    public StatusValidator()
    {
        RuleFor(x => x.type).Must(x => x != Utilities.GetDefaultValue<StatusType>());
    }

}