Ienumrator enumerators and IEnumerable interfaces in C #

The enumerator that declares the IEnumerator

To create an enumerator for a non-generic interface, you must declare the class that implements the IEnumerator interface, and the IEnumerator interface has the following characteristics:

1, she is a member of the System.Collections namespace

2, it contains 3 methods current, MoveNext and reset

For example, the following code implements an enumerator class that lists the color array groups:

Using System.Collections;
     
Class Colorenumerator:ienumerator
{
    string [] Colors;    
    int position=-1;
     
    The public object,
    {get
        {
            if (position==-1), return
                new Exception ();
            if (position==colors.length) return the
                new Exception ();
            return colors[position];
        }
     
    public bool MoveNext ()
    {
        if (position<colors.length-1)
        {
            position++;
            return true;
        }
        else
        {return
            false;
        }
    }
     
    pulic void Reset ()
    {
        position=-1
    }
     
    Public Colorenumerator (string[] thecolors)
    {
        colors=new string[thecolors.length];
        for (int i=0;i<thecolors.length;i++)
        {
            colors[i]=thecolors[i];
        }
    }

See more highlights of this column: http://www.bianceng.cnhttp://www.bianceng.cn/Programming/csharp/

The IEnumerable interface has only one member--getenumerator method, which returns an enumerator for the object.

The following code gives an instance of using the Colorenumerator enumerator class above, and remember that Colorenumerator implements IEnumerator.

Class mycolors:ienumerable
{
    string[] colors={"", "", ""};
    Public IEnumerator GetEnumerator ()//Returns an object of type IEnumerator, which is the enumerable type
    {return
        new Colorenumerator (Colors);
    }