Unable to Validate Existing email Id using [Remote] data annotation attribute

问题

I want to validate existence of Email Id in database using [Remote] data Annotation in Model. But when I call a remote JsonResult Action method the parameter will be null and the result will be always be false and error message will be displayed. What is the problem in my code?

Model :

public class RegisterModel
{
    [Required(ErrorMessage = "Email is Required!", AllowEmptyStrings = false)]
    [Remote("IsEmailIdExists", "Account", ErrorMessage = "Email Id already exists in Database")]
    [Display(Name = "Email Id")]
    [RegularExpression("[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}", ErrorMessage = "Invalid Email Id")]
    public string Email { get; set; }

    [Required(ErrorMessage = "Password is Required!", AllowEmptyStrings = false)]
    [DataType(DataType.Password)]
    [RegularExpression(@"(?=^.{8,15}$)((?=.*\d)(?=.*[A-Z])(?=.*[a-z])|(?=.*\d)(?=.*[^A-Za-z0-9])(?=.*[a-z])|(?=.*[^A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z])|(?=.*\d)(?=.*[A-Z])(?=.*[^A-Za-z0-9]))^.*", ErrorMessage = "Invalid Password!")]
    public string Password { get; set; }

    [System.ComponentModel.DataAnnotations.Compare("Password", ErrorMessage = "Confirm password dose not match!")]
    [Required(ErrorMessage = "Confirm Password is Required!")]
    [DataType(DataType.Password)]
    public string ConfirmPassword { get; set; }
}


public class EmailExists
    {
         public bool EmailCheck(string _email)
         {
              try
              {
                 var con = new SqlConnection();
                 con.ConnectionString = ConfigurationManager.ConnectionStrings["DBConnection"].ConnectionString;
                 SqlCommand com = new SqlCommand("spCheckEmail", con);
                 com.CommandType = CommandType.StoredProcedure;
                 com.Parameters.Add("@uname", SqlDbType.NVarChar, -1).Value = _email;
                 con.Open();
                 com.CommandTimeout = 120;
                 SqlDataReader reader = com.ExecuteReader();
                 if (reader.HasRows)
                 {
                     if (reader.Read())
                     {
                          if (reader["Active"].ToString() == "True")
                          {
                               reader.Dispose();
                               com.Dispose();
                               return true;
                          }
                          else
                          {
                               return false;
                          }
                     }
                     else
                     {
                          return false;
                     }
                 }
                 else
                 {
                     reader.Dispose();
                     com.Dispose();
                     return false;
                 }
                 con.Close();
                 com.Dispose();
            }
            catch(Exception ex)
            {
                return false;
            }
       }
   }

Account Controller

public JsonResult IsEmailIdExists(string EmailId) -> Always Null

{
      Model.EmailExists emailCheck = new FresherModel.EmailExists();
      if(!emailCheck.EmailCheck(EmailId))
      {
           return Json(false);
      }
      else
      {
          return Json(true);
      }
}

回答1:

The name of your property is Email. Change the signature of your action method to match

public JsonResult IsEmailIdExists(string Email)
{
  .....

来源：https://stackoverflow.com/questions/25963697/unable-to-validate-existing-email-id-using-remote-data-annotation-attribute