Remote validation parameters?

Question

I can use remote validation

[Remote("NameValidation","Validation",AdditionalFields="__RequestVerificationToken",ErrorMessage="exists",HttpMethod="POST")]
[Required]
public string Name{get;set;}

it only has one parameter name

how to add additional parameter Id?

I want to validate the Name except current name?

Answer 1

Hi @mc

it only has one parameter name how to add additional parameter Id?

To add additional parameter with Remote validation, you can use the AdditionalFields attribute. To validate two or more additional fields, provide them as a comma-delimited list, code like this:

    public class MyClass
    {
        [Remote("NameValidation", "Home", 
            AdditionalFields = "__RequestVerificationToken," + nameof(Id), 
            ErrorMessage = "exists", HttpMethod = "POST")]
        [Required]
        public string Name { get; set; }

        [Required]
        public string Id { get; set; }
    }

The Home controller:

        public IActionResult RemoteValidationTest()
        {
            return View();
        }
        [HttpPost]
        public IActionResult RemoteValidationTest(MyClass myClass)
        {
            if (ModelState.IsValid)
            {

            }
            return View();
        }
         
        [AcceptVerbs("GET", "POST")]
        public IActionResult NameValidation(string Name, string Id)
        {
            if (string.IsNullOrEmpty(Id))
            {
                return Json($"Id is null.");

            }
            else if (Name=="AA" && Id == "A1")
            {
                return Json($"A user named {Name} already exists.");
            }

            return Json(true);
        }

After that the result as below:

More detail information, see Model validation in ASP.NET Core MVC and Razor Pages(#Additional fields).

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Dillion