Upgrade solution to use fluentvalidation ver 10 exception issue

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validation

Please I need your help to solve FluentValidation issue. I have an old desktop application which I wrote a few years ago. I used FluentValidation Ver 4 and Now I'm trying to upgrade this application to use .Net framework 4.8 and FluentValidation Ver 10, but unfortunately, I couldn't continue because of an exception that I still cannot fix.

I have a base class as follow: 


<pre>    public abstract class ObjBase : IDataErrorInfo
    {
        public ObjBase()
        {
            _Validator = GetValidator();
            Validate();
        }

        protected IValidator _Validator = null;

        protected IEnumerable<ValidationFailure> _ValidationErrors = null;

        #region Validation

        protected virtual IValidator GetValidator()
        {
            return null;
        }

        public IEnumerable<ValidationFailure> ValidationErrors
        {
            get { return _ValidationErrors; }
            set { }
        }

        public void Validate()
        {
            if (_Validator != null)
            {
                ValidationResult results = _Validator.Validate(this); //<== Error in this line
                _ValidationErrors = results.Errors;
            }
        }

        public virtual bool IsValid
        {
            get
            {
                if (_ValidationErrors != null && _ValidationErrors.Count() > 0)
                    return false;
                else
                    return true;
            }
        }

        #endregion

        #region IDataErrorInfo members

        string IDataErrorInfo.Error
        {
            get { return string.Empty; }
        }

        string IDataErrorInfo.this[string columnName]
        {
            get
            {
                StringBuilder errors = new StringBuilder();

                if (_ValidationErrors != null && _ValidationErrors.Count() > 0)
                {
                    foreach (ValidationFailure validationError in _ValidationErrors)
                    {
                        if (validationError.PropertyName == columnName)
                            errors.AppendLine(validationError.ErrorMessage);
                    }
                }

                return errors.ToString();
            }
        }

        #endregion

    }

I have this customer class as follow:

internal class Customer : ObjBase
{
    string _CustomerName = string.Empty;

    public string CustomerName
    {
        get { return _CustomerName; }
        set
        {
            if (_CustomerName == value)
                return;

            _CustomerName = value;
        }
    }

    class CustomerValidator : AbstractValidator<Customer>
    {
        public CustomerValidator()
        {
            RuleFor(obj => obj.CustomerName).NotEmpty();
        }
    }

    protected override IValidator GetValidator()
    {
        return new CustomerValidator();
    }
}

I wrote my validator class inside my customer class because I don’t want to ruse it any ware else, I created a constructor and I put my customer rules their so the FluentValidation can call up on customer validator class and execute validation. I created virtual method in the customer class named ( GetValidator() ) to return an instance of the validator to my base class to call the validate method and obtaining the results.
So what I did works fine on the old version but when I upgrade to FluentValidation Ver 10 I’m getting exception on line “ValidationResult results = _Validator.Validate(this);” The message says “cannot convert from 'ObjBase' to 'FluentValidation.IValidationContext'”
So I tried to solve it but I couldn’t do it. Please I need your advice and help.

Thank you

What I have tried:

I tried this

var context = new ValidationContext<object>(entity);
            var result = validator.Validate(context); 

But doesn't work