从 json 文件下载列表值

Question

我有简单的class

class Person
{
    public string Name { get; set; }
    public string Surname { get; set; }
    public int Age { get; set; }
    public string Login { get; set; }
    public string Password { get; set; }
    public List<string> ParentsNames { get; set; }
}

还有一个json文件

[
  {
    "Name": "Frank",
    "Surname": "Wilson",
    "Age": "52",
    "Login": "fwillock",
    "Password": "willock123",
    "ParentsNames": [
      "Charles",
      "Sarah"
    ]
  },
  { 
    "Name": "Karen",
    "Surname": "Davies",
    "Age": "35",
    "Login": "kdavies",
    "Password": "davies123",
    "ParentsNames": [
      "Jason",
      "Angela"
    ]
  }
]

我需要在控制台中获取人员列表中存在的所有名字或姓氏。我试着用这样的东西：

var JsonDeserialize = File.ReadAllText(fileName);
List<Person> result = JsonSerializer.Deserialize<List<Person>>(JsonDeserialize);
Console.WriteLine(result.Select(x => x.Name).ToList());

但我不知道在我的代码中使用它。提前致谢。

Answer 1

名单

var names= result.Select(i=> new {Name=i.Name, Surname=i.Surname}).ToList();

打印

foreach (var n in result) Console.WriteLine ( $"{n.Name} {n.Surname}");

Answer 2

如果您想自定义在 class 中显示信息的方式，一种选择是为您的 Person 覆盖 ToString() class:

class Person
{
    ...
    // customize however you like
    public override string ToString() => $"{Name} {Surname}";
}

然后单行显示，可以用string.Join():

Console.WriteLine(string.Join(", ", result));

或者如果您希望每个人换行：

result.ForEach(person => Console.WriteLine(person));
// which can be shortened to
result.ForEach(Console.WriteLine);

从 json 文件下载列表值

Download values of list from json file

c#

json.net