如何使用值数组读取appsettings.json

Question

我有以下appSettings.json文件：

  "SundrySettings": {

    "CookieName": "Cookie",

    "AccessGroup": "Software Development",

    "Terminals" :  {
      "Raucherplatz" : "tablet1.local",
      "Service" :      "tablet2.local",  
      "Technik" :      "tablet3.local",  
      "Technik" :      "tablet4.local",  
      "Container" :    "tablet5.local"
    }
  }
}

我想加载到以下结构：

    public class Terminal
    {
        public string Name;
        public string Description;
    }

    public class SundryOptions
    {
        public string CookieName { get; set; } = "dummy";
        public string HRAccessGroup { get; set; } = "dummy";
        public List<Terminal> Terminals;
    }

我会尝试使用以下命令加载：

ServiceProvider sp = services.BuildServiceProvider();
SundryOptions sundryOptions = sp.GetService<IOptions<SundryOptions>>().Value;

我遇到的问题是使用Property Initialisers永远不会正确设置终端列表。我确实需要一个列表（而不是字典），因为在我的例子中，enties可能是双重的，即Technik。

我假设我在类中有一些错误 - >我会很高兴任何指针。

Answer 1

实现以下适当的配置处理：

var cookieName = 
Configuration.GetSection("SundrySettings:CookieName").Value;
var accessGroup = Configuration.GetSection("SundrySettings:AccessGroup").Value;

var terminals = new List<Terminal>()

var terminalSections = this.Configuration.GetSection("Terminals").GetChildren();
foreach (var item in terminalSections)
{
    terminals.Add(new Terminal 
    {
           // perform type mapping here 
    });
}

SundryOptions sundryOption = new SundryOptions()
{
        CookieName = cookieName,
        HRAccessGroup = accessGroup,
        Terminals = terminalList
};

当然可以有更短的版本，但你可以从这里开始。

Answer 2

做如下：

var cookieName = Configuration.GetSection("SundrySettings:CookieName").Value;
var accessGroup = Configuration.GetSection("SundrySettings:AccessGroup").Value;
var terminals = Configuration.GetSection("SundrySettings:Terminals").GetChildren();

List<Terminal>  terminalList = new List<Terminal>();

foreach (var keyValuePair in terminals)
{
     Terminal termial = new Terminal()
     {
          Name = keyValuePair.Key,
          Description = keyValuePair.Value
     };

     terminalList.Add(termial);
}

SundryOptions sundryOption = new SundryOptions()
{
            CookieName = cookieName,
            HRAccessGroup = accessGroup,
            Terminals = terminalList
};

我已经检查了您提供的确切配置，它完美无缺。

Answer 3

如果Terminals是一个列表，则在appSettings中，它应该是一个数组，而不是一个对象。

  "Terminals" :  [
  "Raucherplatz" : "tablet1.local",
  "Service" :      "tablet2.local",  
  "Technik" :      "tablet3.local",  
  "Technik" :      "tablet4.local",  
  "Container" :    "tablet5.local"
]