how to do validations when composing object of a class in other class ?

Question

Hi,

I have an IPAddress class which has one property named ip and in its setter I am validating data coming and if data is invalid it throws an error. (Its code is as the following):

private string ip;

public string IP
{
  get { return ip; }
  set { string PartsOfIP = value.Split('.');

  if (PartsOfIP.Length == 4)
  {
    foreach (string part in PartsOfIP)
     { int a = 0; bool result = int.TryParse(part, out a);

        if (result != true)
        {
          throw new Exception("Invalid IP");

        }
        else { ip = value; }
      }

  }
  else { throw new Exception("Invalid IP");
  }
}

In User Class I want to compose an object of IPAddress class.

I am doing validations for properties of User in User class and validations of Ip in IPAddress class.

My question is how I will compose IPAddress object in UserClass and what will be syntax for this ?

If I again mention get and set here with IPAddress object in User class will my earlier mentioned (in IPAddress class) getter and setter work ?

Answer 1

1. Create constructor for UserClass like this:

   public IPAddress userIpAddress;
   // Other fields and properties
   
   
   public UserCLass(IPAddress ipAddress, .... other fields)
   {
       userIpAddress = ipAddress; // here validation for IPAddress will be called
   }
   

2. Use regular expressions for IPAddress validation

Answer 2

Wouldn't IPAddress.TryParse help here?