I Emumabrable Example

I Emumabrable:

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Collections;

namespace Demos

{

    //In Heric the List Collection from IEnumerable<T> Collection

    //Implemt the Interfaceto  the IEnumerator<T> GetEnumerator()

    class clsMylist<T> : IEnumerable<T>

    {

        T[] arr;

        int size;

        int count;

        //1

        //Creating Public proeprty

        public int Count

        {

            get { return count; }

            set { count = value; }

        }

        //2

        //Constructer of the same class

        //Is like a method but no return type

        public clsMylist()

        {

            //Access the property

            //assign value to property

            size = 5;

            arr = new T[size];

        }

        //3

        //Method in Class

        public void Add(T data)

        {

            arr[count] = data;

            count++;

        }

       

        //step 5(a)

        //Defining the Indexer for T(Because we dont knwoe the dataType of T)

        public T this[int x]

        {

            get

            {

                //beacuse we are storing the list in array so that

                //X is the index for list

                return arr[x];

            }

            set

            {

                arr[x] = value;

            }

        }

        //Step 6

        public IEnumerator<T> GetEnumerator()

        {

            for (int i = 0; i < arr.Length; i++)

            {

                yield return arr[i];

            }

        }

        IEnumerator IEnumerable.GetEnumerator()

        {

            throw new NotImplementedException();

        }

    }

    class TestMylist

    {

        static void Main()

        {

            //Step 4

            clsMylist<int> nums = new clsMylist<int>();

            nums.Add(10);

            nums.Add(20);

            nums.Add(30);

            nums.Add(40);

            nums.Add(50);

            /* Console.WriteLine(nums[2]);

           for (int i = 0; i < nums.Count-1; i++)

           {

               Console.WriteLine(nums[i]);

           }

           //Indexer Concept

            

            */

            //Step 5(c)

            clsMylist<Employee> emps = new clsMylist<Employee>();

            emps.Add(new Employee { EmpNo = 1010, EmpName = "Venu", Dept = "HR", Salary = 12000 });

            emps.Add(new Employee { EmpNo = 1010, EmpName = "Venu", Dept = "SWE", Salary = 12000 });

            emps.Add(new Employee { EmpNo = 1011, EmpName = "srinu", Dept = "CISF", Salary = 13000 });

            emps.Add(new Employee { EmpNo = 1012, EmpName = "Shekar", Dept = "BSF", Salary = 14000 });

            emps.Add(new Employee { EmpNo = 1013, EmpName = "Umakar", Dept = "Student", Salary = 15000 });

            /*  for (int i = 0; i < emps.Count; i++)

              {

               //Not require IEnumerator<> collection

              } */

            //Step 7(b)

            //foreach statement cannot operate on variables of type 'Demos.clsMylist<Demos.Employee>' because 'Demos.clsMylist<Demos.Employee>' does not contain a public definition for 'GetEnumerator'

            //For the above E

            foreach (Employee emp in emps)

            {

                Console.WriteLine("for IEmumarable   " + emp);

            }

            Console.ReadLine();

        }

    }

    class Employee

    {

        //Step 5(b)

        public int EmpNo { get; set; }

        public string EmpName { get; set; }

        public string Dept { get; set; }

        public int Salary { get; set; }

        //Step 7(a)

        public override string ToString()

        {

            return string.Format("{0},{1},{2},{3}", EmpNo, EmpName, Dept, Salary);

        }

    }

}