Strongly typed collection

Kopano Choane

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.

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
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 wilde13y ago
uhm, thats not it, Q is what is the ArgumentOutOfRangeException 5th overload with 3 parameters ???
Vishal Gilbile13y ago
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();
}
}
}