/// <summary>
/// IterateOverList removes the 3rd item of a list and then
/// writes it to console.
/// </summary>
/// <typeparam name="T">The type of iterator</typeparam>
/// <param name="myList">The list to iterate over</param>
public static void IterateOverList <T>(MyGenericList <T> myList)
{
//Get list iterator
IMyEnumeratorInterface <T> myEnumerator = myList.GetMyEnumerator();
//Remove the 3rd item in the list (if a 3rd item exists)
if (myEnumerator.MoveNext())
{
if (myEnumerator.MoveNext())
{
if (myEnumerator.MoveNext())
{
myEnumerator.Remove(); //removes the third item
}
}
}
//Resets to index -1
myEnumerator.Reset();
//Write all items in the list to the console
//This is basically a foreach loop
Console.WriteLine();
while (myEnumerator.MoveNext())
{
Console.Write(myEnumerator.Current + " ");
}
}
/// <summary>
/// Main creates two MyGenericList objects, one of type int and one
/// of type string. They are both initialised with values and then
/// call the generic method IterateOverList for each which removes the 3rd
/// value in the list and then writes the list to console.
/// </summary>
/// <param name="args"></param>
static void Main(string[] args)
{
MyGenericList <int> myIntegerList = new MyGenericList <int>();
MyGenericList <string> myStringList = new MyGenericList <string>();
//MyGenericList add (MyGenericList is initialised to a size 10 array but
//grows as the list grows)
for (int i = 15; i > 0; i--)
{
myIntegerList.Add(i);
}
string[] aToQ = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l",
"o", "p", "q" };
foreach (string letter in aToQ)
{
myStringList.Add(letter);
}
//Show the integer list with the 3rd item removed
IterateOverList <int>(myIntegerList);
Console.ReadKey();
//Show the string list with the 3rd item removed
IterateOverList <string>(myStringList);
Console.ReadKey();
}
/// <summary>
/// The constructor for MyGenericListIterator takes an instance of a
/// MyGenericList(T) as an inparameter. That list becomes the referenced
/// list that is iterated over and the current position is set to -1.
/// A MoveNext() is required to initialise and iterate to positon 0 so
/// Current points to the first item at index 0.
/// </summary>
/// <param name="aList"></param>
public MyGenericListIterator(MyGenericList <T> aList)
{
this.aList = aList;
this.currentPosition = -1;
}
