Ip validation .net core

public class IPAddressAttribute : ValidationAttribute
{

    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        YourViewModel yourviewmodel = (YourViewModel)validationContext.ObjectInstance;

        const string regexPattern = @"^([\d]{1,3}\.){3}[\d]{1,3}$";
        var regex = new Regex(regexPattern);
        if (string.IsNullOrEmpty(yourviewmodel.IpAddress))
        {
            return new ValidationResult("IP address  is null");
        }
        if (!regex.IsMatch(yourviewmodel.IpAddress )|| yourviewmodel.IpAddress.Split('.').SingleOrDefault(s => int.Parse(s) > 255)!=null)
        return new ValidationResult("Invalid IP Address");


        return ValidationResult.Success;
    }
}

// use
[IPAddressAttribute]
[Display(Name = "IP Address")]
public string IpAddress { get; set; }

Source: stackoverflow.com

Similar codes

0 vote172 views1 answer
Membership get user id
C#
1 vote183 views1 answer
Get both item and index in c#
C#
11 votes185 views1 answer
C# check to see if dictionary key exists
C#
-1 vote192 views1 answer
C# count items in listbox
C#
2 votes200 views2 answers
Dictionary to list c#
C#
0 vote205 views1 answer
Unity run all interfaces
C#Unity
0 vote166 views1 answer
C# namespace name form1 could not be found
C#
0 vote169 views1 answer
Wpf get name of clicked element
C#
1 vote217 views1 answer
Get all devices in game unity
C#Unity
80 votes176 views4 answers
How to get random numbers in c#
C#