如何从 appsettings.json 文件中的对象数组中读取值

Question

我的应用设置json文件

       {
         "StudentBirthdays": [
                { "Anne": "01/11/2000"},
                { "Peter": "29/07/2001"},
                { "Jane": "15/10/2001"},
                { "John": "Not Mentioned"}
            ]
        }

我有一个单独的配置 class。

public string GetConfigValue(string key)
{
    var value = _configuration["AppSettings:" + key];
    return !string.IsNullOrEmpty(value) ? Convert.ToString(value) : string.Empty;
}

我试过的是，

 list= _configHelper.GetConfigValue("StudentBirthdays");

对于以上我没有得到值。

如何读取值（我想分别读取学生的姓名和生日）。

感谢任何帮助

Answer 1

试试这个

using System.Linq;

public List<Student> GetStudentsFromConfig()
{
    return  _configuration
    .GetSection("StudentBirthdays")
    .Get<Dictionary<string, string>[]>()
    .SelectMany(i => i)
    .Select(ie => new Student {Name=ie.Key, DOB=ie.Value})
    .ToList();
}

测试

items= _configHelper.GetStudentsFromConfig();

foreach (var item in items) Console.WriteLine($"Name: {item.Name} , DOB: {item.DOB} ");

结果

Name: Anne , DOB: 01/11/2000 
Name: Peter , DOB: 29/07/2001 
Name: Jane , DOB: 15/10/2001 
Name: John , DOB: Not Mentioned

class

public class Student
{
    public string Name { get; set; }
    public string DOB { get; set; }
}

Answer 2

您可以使用以下代码获取生日：

// get the section that holds the birthdays
var studentBirthdaysSection = _configuration.GetSection("StudentBirthdays");

// iterate through each child object of StudentBirthdays
foreach (var studentBirthdayObject in studentBirthdaysSection.GetChildren())
{
    // your format is a bit weird here where each birthday is a key:value pair,
    // rather than something like { "name": "Anne", "birthday": "01/11/2000" }
    // so we need to get the children and take the first one
    var kv = studentBirthdayObject.GetChildren().First();
    string studentName = kv.Key;
    string studentBirthday = kv.Value;
    Console.WriteLine("{0} - {1}", studentName, studentBirthday);
}

Try it online

Answer 3

试试这个：像下面这样创建 Model/Class：

public class StudentBirthday
{
   String Name,
   String Birthday
}

然后像这样访问值：

List<StudentBirthday StudentBirthdays = 
   _config.GetSection("Main:StudentBirthdays").Get<List<StudentBirthday();

如何从 appsettings.json 文件中的对象数组中读取值

How to read values from array of objects in appsettings.json file

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