C＃动态填充匿名类列表

Question

如果我具有列表的静态初始化：

var list = new[]
{
    new { Username = "Falcore", Score = 1293, },
    new { Username = "Dunsby", Score = 2342, },
    new { Username = "Habisham", Score = 5234, },
};

如何动态声明和填充这样的列表？即错误的伪代码：

var list = new[] {};

list.Add(new { Username = "Falcore", Score = 1293, });