Menu
I am trying to create a custom validation attribute.
public class PhoneValidator : ValidationAttribute
{
public override bool IsValid(object value)
{
return new RegularExpressionAttribute(@"^[+0]\d+").IsValid(Convert.ToString(value).Trim());
}
}
And I use this to use
[PhoneValidator]
public string PhoneNumber { get; private set; }
I copied it from a website, in theory this should work. But I couldn't make it work.
711
Here is example from MSDN:
PhoneMaskAttribute .cs:
using System;
using System.Globalization;
using System.ComponentModel.DataAnnotations;
[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field, AllowMultiple = false)]
sealed public class PhoneMaskAttribute : ValidationAttribute
{
// Internal field to hold the mask value.
readonly string _mask;
public string Mask
{
get { return _mask; }
}
public PhoneMaskAttribute(string mask)
{
_mask = mask;
}
public override bool IsValid(object value)
{
var phoneNumber = (String)value;
bool result = true;
if (this.Mask != null)
{
result = MatchesMask(this.Mask, phoneNumber);
}
return result;
}
// Checks if the entered phone number matches the mask.
internal bool MatchesMask(string mask, string phoneNumber)
{
if (mask.Length != phoneNumber.Trim().Length)
{
// Length mismatch.
return false;
}
for (int i = 0; i < mask.Length; i++)
{
if (mask[i] == 'd' && char.IsDigit(phoneNumber[i]) == false)
{
// Digit expected at this position.
return false;
}
if (mask[i] == '-' && phoneNumber[i] != '-')
{
// Spacing character expected at this position.
return false;
}
}
return true;
}
public override string FormatErrorMessage(string name)
{
return String.Format(CultureInfo.CurrentCulture,
ErrorMessageString, name, this.Mask);
}
}
Usage:
CustomerMetadata.cs:
using System.Web.DynamicData;
using System.ComponentModel.DataAnnotations;
[MetadataType(typeof(CustomerMetadata))]
public partial class Customer
{
}
public class CustomerMetadata
{
[PhoneMask("999-999-9999",
ErrorMessage = "{0} value does not match the mask {1}.")]
public object Phone;
}
Links:
How to: Customize Data Field Validation in the Data Model Using Custom Attributes
60
1-create a class for this
[AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
public class MobileValidationAttribute : ValidationAttribute
{
public MobileValidationAttribute(string errorMessage)
{
ErrorMessage = errorMessage;
}
public override bool IsValid(object value)
{
if (value == null) return false;
return value.ToString().Length == 13;
}
}
2-create a model
public class UserModel
{
[Display(Name ="Phone Number")]
[MobileValidation("{0} is invalid")]
[Required(AllowEmptyStrings =false,ErrorMessage ="{0} is required")]
public string PhoneNumber { get; set; }
}
3- in view use this code
@model TestAttribute.Models.UserModel
@{
Layout = null;
}
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width" />
<title>Index</title>
</head>
<body>
<div>
<form method="post" action="/Home/Index">
@Html.LabelFor(a=>a.PhoneNumber)
@Html.TextBoxFor(a=>a.PhoneNumber)
@Html.ValidationMessageFor(a=>a.PhoneNumber)
<br />
<br />
<button type="submit">Add</button>
</form>
</div>
</body>
</html>
4- and Controller
public class HomeController : Controller
{
public ActionResult Index()
{
return View(new UserModel());
}
[HttpPost]
public ActionResult Index(UserModel model)
{
if (ModelState.IsValid)
{
return Content("Ok");
}
return View(model);
}
}
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
