如何在C#中创建关键字/类型？

int myNumber = 10;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class MyList<T>
{
    private List<T> _items = new List<T>();

    public void Add(T item)
    {
        _items.Add(item);
    }

    public T Get(int index)
    {
        return _items[index];
    }
}

var intList = new MyList<int>();
intList.Add(10);
int myNumber = intList.Get(0);