IEnumerable interface exposes the enumerator, which supports a simple iteration over a non-generic collection. : IEnumerable « Collections Data Structure « C# / C Sharp

1. C# / C Sharp
2. Collections Data Structure
3. IEnumerable

IEnumerable interface exposes the enumerator, which supports a simple iteration over a non-generic collection.

   


using System;
using System.Collections;

public class Employee
{
    public Employee(string fName, string lName)
    {
        this.firstName = fName;
        this.lastName = lName;
    }

    public string firstName;
    public string lastName;
}

public class EmployeeCollection : IEnumerable
{
    private Employee[] _people;
    public EmployeeCollection(Employee[] pArray)
    {
        _people = new Employee[pArray.Length];

        for (int i = 0; i < pArray.Length; i++)
        {
            _people[i] = pArray[i];
        }
    }

    IEnumerator IEnumerable.GetEnumerator()
    {
       return (IEnumerator) GetEnumerator();
    }

    public EmployeeCollectionEnum GetEnumerator()
    {
        return new EmployeeCollectionEnum(_people);
    }
}

public class EmployeeCollectionEnum : IEnumerator
{
    public Employee[] _people;

    int position = -1;

    public EmployeeCollectionEnum(Employee[] list)
    {
        _people = list;
    }

    public bool MoveNext()
    {
        position++;
        return (position < _people.Length);
    }

    public void Reset()
    {
        position = -1;
    }

    object IEnumerator.Current
    {
        get
        {
            return Current;
        }
    }

    public Employee Current
    {
        get
        {
            try
            {
                return _people[position];
            }
            catch (IndexOutOfRangeException)
            {
                throw new InvalidOperationException();
            }
        }
    }
}

class App
{
    static void Main()
    {
        Employee[] peopleArray = new Employee[3]
        {
            new Employee("A", "D"),
            new Employee("B", "E"),
            new Employee("C", "F"),
        };

        EmployeeCollection peopleList = new EmployeeCollection(peopleArray);
        foreach (Employee p in peopleList)
            Console.WriteLine(p.firstName + " " + p.lastName);

    }
}

   
    
    
  

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