How I can validate urls in C# for localhost

Question

I am using UrlAttribute in MVC

but its not accepting the localhost urls e.g http://localhost/GCWeb

[Url(ErrorMessage = "please_enter_valid_ftp_url", ErrorMessage = null)] 
public string Url { get; set; }

This validates the urls but not for localhost urls.

How can I do this?

Answer 1

I also suggest to create a custom validator attribute class. But I'd like to use System.Uri class to validate instead of custom personal regex.

public class UriAttribute: ValidationAttribute
{
    protected override ValidationResult IsValid(object value, ValidationContext validationContext)
    {
        Uri uri;
        bool valid = Uri.TryCreate(Convert.ToString(value), UriKind.Absolute, out uri);

        if (!valid)
        {
            return new ValidationResult(ErrorMessage);
        }
        return ValidationResult.Success;
    }
}

By using System.Uri class, we can leave out chances of error for own regex.