I am trying to create a remote validation as follows:
[Remote("CheckValue", "Validate", ErrorMessage="Value is not valid")]
public string Value { get; set; }
I am using ASP.NET Core (ASP.NET 5) and it seems Remote is not available. Does anyone know how to do this with ASP.NET CORE?
The RemoteAttribute is part of ASP.Net MVC Core:
Microsoft.AspNet.Mvc namespace. See RemoteAttribute in github.Microsoft.AspNetCore.Mvc namespace. See RemoteAttribute in github.For example, in RC1 create a new MVC site with authentication. Then update the generated LoginViewModel with a dummy remote validation calling a method in the home controller:
using Microsoft.AspNet.Mvc;
using System.ComponentModel.DataAnnotations;
public class LoginViewModel
{
[Required]
[EmailAddress]
[Remote("Foo", "Home", ErrorMessage = "Remote validation is working")]
public string Email { get; set; }
...
}
If you create that dummy method in the home controller and set a breakpoint, you will see it is hit whenever you change the email in the login form:
public class HomeController : Controller
{
...
public bool Foo()
{
return false;
}
}
In the meantime, the documentation is there and available here. In a nutshell you just need to decorate your view model's property with the following:
[Remote(action: "Foo", controller: "Bar", ErrorMessage = "Remote validation is working")]
[Required]
[Display(Name = "Name")]
public string Name { get; set; }
Then create an action (named 'Foo' in this example) in the controller (named 'Bar' in this example) and add your logic there:
[AcceptVerbs("Get", "Post")]
public async Task<IActionResult> Foo(string name)
{
bool exists = await this.Service.Exists(name);
if (exists)
return Json(data: false);
else
return Json(data: true);
}
Final note: the Remote attribute is in the Microsoft.AspNetCore.Mvc namespace.
