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

22 votes183 views2 answers
How do i convert to base64 c#
C#
0 vote174 views1 answer
Eleventy set default layout
C#
4 votes193 views1 answer
C# get user directory
C#
0 vote198 views1 answer
Unity input get axis
C#
0 vote180 views1 answer
Csharp functions
C#
1 vote196 views1 answer
Group by ef core
C#
0 vote191 views1 answer
C# is string nullable
C#
1 vote215 views1 answer
Nullable unique constraint ef
C#
0 vote175 views2 answers
C# how to disable a event
C#
16 votes225 views3 answers
Remove item from list in for loop c#
C#