c# - 如何同时声明和填充集合？

Question

我正在尝试以下操作:

    public class ResultDTO
    {
        public int Id { get; set; }
        public string Text { get; set; }
        public int AnswerId { get; set; }
        public string AnswerText { get; set; }
    }

List<ResultDTO> result1 = new List<ResultDTO> () {
   new ResultDTO () { Id:1, Text: "abc", AnswerId: "1", AnswerText: "Aab1" },
   new ResultDTO () { Id:1, Text: "abc", AnswerId: "2", AnswerText: "Aab2" },
   new ResultDTO () { Id:1, Text: "abc", AnswerId: "3", AnswerText: "Aab3" },
   new ResultDTO () { Id:1, Text: "def", AnswerId: "4", AnswerText: "Aab4" },
   new ResultDTO () { Id:1, Text: "def", AnswerId: "5", AnswerText: "Aab5" },
   new ResultDTO () { Id:1, Text: "def", AnswerId: "6", AnswerText: "Aab6" }
}

这让我在 IDE 中出现许多语法错误。有人可以告诉我做错了什么吗？

Answer 1

这不是 JSon 对象和数组。可以使用 = 运算符分配属性。

List<ResultDTO> result1 = new List<ResultDTO> () {
   new ResultDTO () { Id=1, Text= "abc", AnswerId= 1, AnswerText= "Aab1" },
   ....
}

我建议您创建具有属性参数的构造函数；

public class ResultDTO
{
    public int Id { get; private set; }
    public string Text { get; set; }
    public int AnswerId { get; set; }
    public string AnswerText { get; set; }

    public ResultDTO(int id, string _text, int ansId, string ansText)
    {
        Id=id;
        Text = _text;
        AnswerId = ansId;
        AnswerText = ansText;
    }
}

然后像这样初始化列表。

List<ResultDTO> result1 = new List<ResultDTO> () {
   new ResultDTO (1,"abc",1,"Aab1"),
   new ResultDTO (1,"abc",2,"Aab2"),
   new ResultDTO (1,"abc",3,"Aab3"),
   ....
}

当您将属性指定为只读时，这会给您带来一些好处。看上面的类我已经声明了Id属性公开可读并且不能在类外设置。