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

1 vote285 views1 answer
C# add byte to byte array
C#
42 votes321 views2 answers
How to replace last character of string in c#
C#
0 vote284 views1 answer
C# timer single tick
C#
10 votes276 views2 answers
Forech unity
C#Unity
2 votes274 views1 answer
Set player position unity
C#
0 vote485 views1 answer
How to access path position variable in unity
C#
2 votes253 views1 answer
Command to create blazor server app using cli commands
C#
0 vote254 views2 answers
Combobox in datagrid wpf
C#
4 votes268 views2 answers
Wpf label text in center
C#
0 vote274 views1 answer
Convert int to short c#
C#