如何从 appsettings.json 读取嵌套循环 json 值并分配给对象

Question

"SalesOrderFilters": {
    "skip": 0,
    "take": 0,
    "sort": [
      {
        "sortBy": "productGroup",
        "sortDirection": "Ascending"
      }
    ],
    "filters": [
      {
        "columnFilters": [
          {
            "field": "productGroup",
            "operator": "eq",
            "value": "CC05"
          },
          {
            "field": "productGroup",
            "operator": "eq",
            "value": "CC07"
          }
        ],
        "logic": "or"
      },
      {
        "columnFilters": [
          {
            "field": "specFileDate",
            "operator": "lte",
            "value": "6/26/2017 11:17:20 AM"
          },
          {
            "field": "specFileDate",
            "operator": "gte",
            "value": "4/26/2017 11:17:20 AM"
          }
        ],
        "logic": "and"
      },
      {
        "columnFilters": [
          {
            "field": "designSpecialIndicator",
            "operator": "eq",
            "value": "N"
          }
        ],
        "logic": "and"
      },
      {
        "columnFilters": [
          {
            "field": "buMfgLocId",
            "operator": "eq",
            "value": "5"
          }
        ],
        "logic": "and"
      },
      {
        "columnFilters": [
          {
            "field": "orderType",
            "operator": "eq",
            "value": "SO"
          }
        ],
        "logic": "and"
      },
      {
        "columnFilters": [
          {
            "field": "buMfgLocation",
            "operator": "contains",
            "value": "lexi"
          }
        ],
        "logic": "and"
      }
    ]
  }

Answer 1

你应该看看options pattern。

选项模式使用类来提供对相关设置组的强类型访问。当配置设置按场景隔离到单独的类中时，应用程序遵循两个重要的软件工程原则：

接口隔离原则 (ISP) 或封装：场景 （类）依赖于配置设置只依赖于 他们使用的配置设置。关注点分离：设置 对于应用程序的不同部分不依赖或耦合到一个 另一个。

Answer 2

只是想分享一下我是如何在我的应用上执行此操作的（假设 appsettings.json 是您的默认配置文件）：

public class ConfigHelper : IConfigHelper
{
    private IConfiguration Configuration { get; }

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

    public string GetAppSettings(string key)
    {
        return Configuration[key];
    }
}

用法：

...
ConfigHelper.GetAppSettings("SalesOrderFilters:Skip");
...

或者这种方法：

创建一个类来表示您的配置：

public class SalesOrderFilters
{
    public int Skip { get; set; }
    public int Take { get; set; }
    public List<Filters> Filters { get; set; }
    ...
}

public class Filter
{
   public List<ColumnFilter> ColumnFilters { get; set; }
   ...
}

在您的 Startup.cs 中

public void ConfigureServices(IServiceCollection services)
{
    ...
    services.AddSingleton(typeof(SalesOrderFilters), Configuration.GetSection("SalesOrderFilters").Get<SalesOrderFilters>());
    ...
}

然后你可以在你的控制器/服务类中注入这个对象：

public class MyController
{
    private SalesOrderFilters _settings;

    public MyController(SalesOrderFilters settings)
    {
        _settings = settings;
    }
}