Strongly typed collection

Question

Good Morning

Lets I want to validate something inside a property...

private string _phoneType;

public string PhoneType
{
    get
    {
        return _phoneType;
    }
    set
   {
         _phoneType = value;
   }
}

valid values for PhoneType are: "Home", "Mobile" and "Work". If an invalid value
is supplied, an ArgumentOutOfRangeException must be thrown using the 5th
overload with 3 parameters, with meaningful messages

Please explain what that above statement mean.

Vulpes · Answer

My guess is that the statement is talking about the 5th overload of the ArgumentException constructor which takes 3 parameters though it's actually the 6th overload in the latest version of the MSDN docs: http://msdn.microsoft.com/en-US/library/system.argumentexception.argumentexception(v=vs.110).aspx So I think what's needed is something like this: private string _phoneType; public string PhoneType { get { return _phoneType; } set { if(value != Home && value != Mobile && value != Work) { string message = String.Format(Value must be Home Mobile or Work - {0} was passed value); throw new ArgumentException(message PhoneType null); } _phoneType = value; } }

Emile De wilde · Answer

uhm thats not it Q is what is the ArgumentOutOfRangeException 5th overload with 3 parameters ???

Vishal Gilbile · Answer

Hello Friend Try the following Code. using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace querytest { /// /// Specifying the Enumeration Value /// setting None as Default with value as Zero /// enum EPhoneType { None = 0 Home = 1 Mobile = 2 Work = 3 } class Program { private string _phoneType; public string PhoneType { get { return _phoneType; } set { EPhoneType phoneValue = GetEnumConstants (value); //Checking if the phoneValue!=None then set the value to _phoneType Property if (phoneValue.ToString() != None) _phoneType = value; } } /// /// Generic Function which will return the value from the Enumeration /// EPhoneType /// /// Enum Type /// enumeration Value /// returns T private T GetEnumConstants (string enumValue) where T : struct { T str; bool isValid = Enum.TryParse (enumValue true out str); if (isValid) return str; else return default(T); } static void Main(string[] args) { Console.WriteLine(Enter your Phone Type); string phoneType = Console.ReadLine(); Program obj = new Program(); obj.PhoneType = phoneType; Console.WriteLine(obj.PhoneType); Console.ReadLine(); } } }