.net - 具有自动属性的集合初始值设定项

Question

有没有办法在使用自动属性的同时使用集合初始值设定项？

// Uses collection initializer but not automatic properties
private List<int> _numbers = new List<int>();
public List<int> Numbers
{
    get { return _numbers; }
    set { _numbers = value; }
}


// Uses automatic properties but not collection initializer
public List<int> Numbers { get; set; }


// Is there some way to do something like this??
public List<int> Numbers { get; set; } = new List<int>();

Answer 1

不，基本上。您必须在构造函数中初始化集合。老实说，无论如何，可设置的集合很少是个好主意；；我实际上只使用(更改您的第一个版本，删除 set):

private readonly List<int> _numbers = new List<int>();
public List<int> Numbers { get { return _numbers; } }

或者如果我想将构造推迟到第一次访问时:

private List<int> _numbers;
public List<int> Numbers {
    get { return _numbers ?? (_numbers = new List<int>()); }
}