C# 列表类型 增加 删除 计数

Console.WriteLine();
names.Add("Maria");
names.Add("Bill");
names.Remove("Ana");
foreach (var name in names)
{
  Console.WriteLine($"Hello {name.ToUpper()}!");
}

Console.WriteLine($"My name is {names[0]}.");
Console.WriteLine($"I've added {names[2]} and {names[3]} to the list.");
Console.WriteLine($"The list has {names.Count} people in it");