无法将 json 部分加载到字典中答案

【问题标题】：Can't load json section into a dictionary无法将 json 部分加载到字典中
【发布时间】：2018-11-27 06:43:29
【问题描述】：

我在 appsettings.json 中有一个配置，例如：

"ClientId": {
      "US": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "UK": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "PK": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "DK": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "IN": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "LV": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "EE": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      }
    }

现在我想将此部分映射到一个字典中，例如：

 public class ClientIds
    {
        public Dictionary<string, List<string>> US { get; set; }
        public Dictionary<string, List<string>> UK { get; set; }
        public Dictionary<string, List<string>> PK { get; set; }
        public Dictionary<string, List<string>> DK { get; set; }
        public Dictionary<string, List<string>> IN { get; set; }
        public Dictionary<string, List<string>> LV { get; set; }
        public Dictionary<string, List<string>> EE { get; set; }
    }

但我每次都得到空值。这是我的启动配置：

  services.Configure<ClientIds>((settings) =>
  {
     Configuration.GetSection("ClientId").Bind(settings);
  });

这是我的服务注入：

    private readonly ClientIds _clientIds;
    public MyService(IOptions<ClientIds> clientIds)
    {
      _clientIds = clientIds.Value;
    }

这里有什么问题？

【问题讨论】：

您的示例代码对我有用。你能创建一个minimal reproducible example吗？

标签： .net json asp.net-core

【解决方案1】：

所以首先你的 json 应该是这样的：

{
"ClientId": {
      "US": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "UK": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "PK": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "DK": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "IN": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "LV": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      },
      "EE": {
        "xxxxxxxx": [ "xxxxxxxx" ]
      }
    }
}

那么你的 c# 类应该是这样的：

public class US
{
    public List<string> xxxxxxxx { get; set; }
}

public class UK
{
    public List<string> xxxxxxxx { get; set; }
}

public class PK
{
    public List<string> xxxxxxxx { get; set; }
}

public class DK
{
    public List<string> xxxxxxxx { get; set; }
}

public class IN
{
    public List<string> xxxxxxxx { get; set; }
}

public class LV
{
    public List<string> xxxxxxxx { get; set; }
}

public class EE
{
    public List<string> xxxxxxxx { get; set; }
}

public class ClientId
{
    public US US { get; set; }
    public UK UK { get; set; }
    public PK PK { get; set; }
    public DK DK { get; set; }
    public IN IN { get; set; }
    public LV LV { get; set; }
    public EE EE { get; set; }
}

public class RootObject
{
    public ClientId ClientId { get; set; }
}

当您了解了适用于 .NET 的 Newtonsoft JSON nuget 包并使用反序列化方法时。

它应该看起来像这样。

var object = JsonConvert.DeserializeObject<DestinationObject>(json);

【讨论】：

【解决方案2】：

在您的startup.cs 中添加代码

public Startup(IConfiguration configuration)
 {
     Configuration = configuration;
 }

 public IConfiguration Configuration { get; }

在ConfigureServices方法中添加这部分

  services.Configure<ClientIds>(Configuration.GetSection("ClientId"));

你的ClientIds 班级

    public class ClientIds
    {
        public Dictionary<string, string[]> US { get; set; }
        public Dictionary<string, string[]> UK { get; set; }
        public Dictionary<string, string[]> PK { get; set; }
        public Dictionary<string, string[]> DK { get; set; }
        public Dictionary<string, string[]> IN { get; set; }
        public Dictionary<string, string[]> LV { get; set; }
        public Dictionary<string, string[]> EE { get; set; }
    }

【讨论】：