How to handle more than 6 parameters in a validation function?

[winsonet]

It's seem just can handle there are 6 parameters in Toolchain.Instance.AddFunction, how about I need to pass more parameters?

Because there are complex with my validation, I need to connect to database to get data for some checking, so in my case, I will pass a string field and concate multiple parameters as below in client-side:

var param = par1 + '|' + par2 + '|' + .... + par8

and I use ajax call to pass to backend, then will split these parameters in backend function, I find that just can work find on client-side validation, but not in backend , when the form submit, the backend validation will be failed, because it will not pass these concate parameters at this time.

below is my register code:

Toolchain.Instance.AddFunction<string, bool>("CheckDuplicateOrderDate", 
                (parameters) => CheckDuplicateOrderDate(parameters));

backend function:

public static bool CheckDuplicateOrderDate(string parameters)
{
   var param = parameters.Split('|');
   var order_no = param[0];
   var scb_code = param[1];
   var item_code = param[2];
   var order_cat = param[3];
   var order_start_date = param[4];
   var order_end_date = param[5];
   var campaign_code = param[6];
   var source_code = param[7];

   //to do other logic....
}

in javascript:

ea.addMethod('CheckDuplicateOrderDate', function (scb_code) {

            var form = $(this.__meta__.form);
            var order_no = form.find('#order_no').val();
            var item_code = form.find('#item_code').val();
            var order_cat = form.find('#order_cat').val();
            var order_start_date = form.find('#order_start_date').val();
            var order_end_date = form.find('#order_end_date').val() ;
            var campaign_code = form.find('#campaign_code').val();
            var source_code = form.find('#source_code').val();
            var parameters = order_no + '|' + scb_code + '|' + item_code + '|' +
                order_cat + '|' + order_start_date + '|' + order_end_date + '|' + campaign_code + '|' + source_code

            //use ajax to pass to backend
           var jqXHR = $.ajax({
            url: '/Orders/CheckDuplicateOrderDate',
            type: 'POST',
            async: false, //disable async for handle the return value 
            data: {parameters :parameters }
        });
        return jqXHR.responseJSON;
}

in controller

[HttpPost]
public JsonResult CheckDuplicateOrderDate(string parameters)
{
    if(ModelValidationMethods.CheckDuplicateOrderDate(parameters))
    {
        return Json(new { success = false });
    }

    return Json(new { success = true });
}

I know this is not a good solution, do you have any ideas?

Thanks!