c# - List<T> 在类中使用

Question

我找到了一个关于在类中使用 List 的代码示例。有些代码我不明白。Name 和 Description 字段在 List 定义中有值，但 Album 字段没有值。(

new genre { Name = "Rock", Description = "Rock music", Album?? }

)。为什么？

public class Genre
{
    public string  Name { get; set; }
    public string  Description { get; set; }
    public List<Album> Albums { get; set; }
}

public class Album
{
    public string  Title { get; set; }
    public decimal  Price { get; set; }
    public Genre  Genre { get; set; }
}

var genre = new List<Genre>
{
    new genre { Name = "Rock" , Description = "Rock music" },
    new genre { Name = "Classic" , Description = "Middle ages music" }
};

new List<Album>
{
    new Album { Title = "Queensrÿche", Price = 8.99M, Genre = genre.Single(g => g.Name == "Rock") },
    new Album { Title = "Chopin", Price = 8.99M, Genre = genre.Single(g => g.Name == "Classic") }
};

Answer 1

此 C# 语法称为对象和集合初始值设定项。

这是 documentation .

此语法允许您设置在对象或集合初始化期间有权访问的属性。