[AttributeUsage(AttributeTargets.Property | AttributeTargets.Parameter)]
public class MakeTinyMceRequiredAttribute : ValidationAttribute, IClientModelValidator
{
    public MakeTinyMceRequiredAttribute()
    {
        ErrorMessage = "لطفا {0} را وارد نمایید";
    }

    protected override ValidationResult IsValid(object value,
        ValidationContext validationContext)
    {
        var displayName = validationContext.DisplayName;
        ErrorMessage = ErrorMessage.Replace("{0}", displayName);

        if (string.IsNullOrWhiteSpace(value?.ToString()))
        {
            return new ValidationResult(ErrorMessage);
        }
        return ValidationResult.Success;
    }

    public void AddValidation(ClientModelValidationContext context)
    {
        var displayName = context.ModelMetadata.ContainerMetadata
            .ModelType.GetProperty(context.ModelMetadata.PropertyName)
            .GetCustomAttributes(typeof(DisplayAttribute), false)
            .Cast<DisplayAttribute>()
            .FirstOrDefault()?.Name;
        ErrorMessage = ErrorMessage.Replace("{0}", displayName);

        MergeAttribute(context.Attributes, "data-val", "true");
        MergeAttribute(context.Attributes, "data-val-makeTinyMceRequired", ErrorMessage);
    }
    public bool MergeAttribute(IDictionary<string, string> attributes, string key, string value)
    {
        if (attributes.ContainsKey(key))
        {
            return false;
        }
        attributes.Add(key, value);
        return true;
    }
}

if (jQuery.validator) {
    // For hidden inputs
    $.validator.setDefaults({
        ignore: []
    });

    // makeTinyMceRequired
    jQuery.validator.addMethod('makeTinyMceRequired', function (value, element, param) {
        var editorId = $(element).attr('id');
        var editorContent = tinyMCE.get(editorId).getContent();
        $('body').append(`<div id="test-makeTinyMceRequired">${editorContent}</div>`);
        var result = isNullOrWhitespace($('#test-makeTinyMceRequired').text());
        $('#test-makeTinyMceRequired').remove();
        return !result;
    });
    jQuery.validator.unobtrusive.adapters.addBool('makeTinyMceRequired');
}
function isNullOrWhitespace(input) {
    if (typeof input === 'undefined' || input == null)
        return true;
    return input.replace(/\s/g, '').length < 1;
}