using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace ExtensionExample {

    class ExtensionExample {

        static void Main(string[] args) {

            Console.WriteLine("ExtensionExample.cs");
            Console.Write("Enter a number between 1 and 10 ==> ");

            int i = int.Parse(Console.ReadLine());

            Console.WriteLine("The value is {0} ",
                i.CheckRange(1, 10) ? i.ToString() : "out of range");

            i.

            Console.Write("Enter of these values {CA | NY | TX | FL | NC} ==> ");
            String state = Console.ReadLine().ToUpper();

            Console.WriteLine("The state is {0} ",
                state.CheckValues("CA", "NY", "TX", "FL", "NC") ? state : " not in the list");

            Console.WriteLine("End of tester");
            Console.ReadLine();
        }
    }

    /// <summary>
    /// Class that contains commonly used "check" extensions to 
    /// perform DDS-like checking of data types.
    /// </summary>
    /// <remarks>
    /// The class that contains extension methods must be a static class.
    /// The methods within the class are static methods.
    /// </remarks>
    public static class CheckExtensions {

        /// <summary>
        /// Extension method that adds a range checking feature to integer data.
        /// </summary>
        /// <param name="number">The integer value to check.</param>
        /// <param name="lowValue">The inclusive low value of the range to check.</param>
        /// <param name="highValue">The inclusive high value of the range to check.</param>
        /// <returns>Boolean indicating whether or not the value is within the range.</returns>
        public static bool CheckRange(this int number,
                                      int lowValue,
                                      int highValue) {

            if ((number >= lowValue) && (number <= highValue)) { return true;  }
            else                                               { return false; }
        }

        /// <summary>
        /// Extension method that adds a list of values checking feature to string data.
        /// </summary>
        /// <param name="testValue">The string value to check.</param>
        /// <param name="values">A comma-delimited list of string values that are the
        /// valid values.</param>
        /// <returns>Boolean indicating whether or not the value is in the list.</returns>
        public static bool CheckValues(this String testValue,
                                       params String[] values) {

            if (values.Contains(testValue)) { return true;  }
            else                            { return false; }
        }
    }
}