public Attribute this[int index],this[int

public Attribute this[int index],this[int
怎么用?

对象自身索引的意思.
public class MyCollection
{
private List m_list;
public MyCollection()
{
m_list = new List();
}
public void Add(Attribute item)
{
m_list.Add(item);
}
public Attribute this[int index]
{
get { return m_list[index]; }
}
static void Main()
{
MyCollection mc = new MyCollection();
mc.Add(new ObsoleteAttribute());
mc.Add(new WebMethodAttribute());
Attribute atti = mc[1]; //WebMethodAttribute
}
}