C# 类索引器Class Indexer

public class CTest
{
    private List<string> _strList = new List<string>();

    public List<string> Items
    {
        get{ return(_strList); }
        set{ _strList = value; }
    }

    //int 索引器
    public string this[int i]
    {
        get 
        {
            if (i >= 0 && i < _strList.Count)
                return (_strList[i]);
            else
                throw new IndexOutOfRangeException("Error Index" + i);
        }
        set
        {
            if (i >= 0 && i < _strList.Count)
                _strList[i] = value;
            else
                throw new IndexOutOfRangeException("Error Index" + i);
        }        
    }
}

static void Main(string[] args)
{
    CTest test = new CTest();
    test.Items.Add("test1");
    test.Items.Add("test2");
    test.Items.Add("test3");
    test[0] = "test";

    for (int ix = 0; ix < test.Items.Count; ix++)
    {
        Console.WriteLine(test[ix]);
    }            
}