从配置文件中读取 Json 对象列表并在控制器中返回它总是返回 null

问题描述

我有一个这样的 GameSettingOptions 类：

id   Cost   LineNo          TotalCost
-----------------------     ---------
1     10      01             10
2     20      02             40
3     30      03            150

我正在尝试从这样设置的服务中检索它：

public class GameSettingOptions
    {
        public int gameId { get; set; }
        public string iconSize { get; set; }
        public int sortOrder { get; set; }
        public string[] chips { get; set; }
    }

这是我的 json 对象，其中游戏设置是一个数组：

 public Startup(IConfiguration configuration,IHostingEnvironment environment)
        {
            
            var builder = new ConfigurationBuilder()
                .SetBasePath(environment.ContentRootPath)
                .AddJsonFile("GameSettingOptions.json",optional: true,reloadOnChange: true);
            Configuration = builder.Build();
        }
public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.AddCors(c =>
            {
                c.AddPolicy("AllowOrigin",options => options.AllowAnyOrigin());
            });
            services.Configure<GameSettingOptions>(Configuration.GetSection("GameSettings"));
        }

这就是我尝试使用此控制器和依赖项注入来检索它的方式

{
  "GameSettings": [
    {
      "gameId": 1,"iconSize": "big","sortOrder": 6
    },{
      "gameId": 2,"iconSize": "small","sortOrder": 4
    }
  ]
}

我尝试过的：

1. 将服务和使用该服务的属性都变成一个列表，返回null

public class GameSettingsControllers : ControllerBase
    {
        private readonly GameSettingOptions Options;
        public GameSettingsControllers(IOptionsSnapshot<GameSettingOptions> options)
        {
            Options = options.Value;

        }

        public object GetGameSettings()
        {
            
                return new JsonResult($"gameId: {Options.gameId}," + $"iconSize: {Options.iconSize},"
                    + $"sortOrder: {Options.sortOrder}," + $"chips: {Options.chips} ");
          
        }
    }

2. 创建另一个具有 GameSettingOptions 属性集合的类，然后我绑定并注入新类，这也返回 null

services.Configure<List<GameSettingOptions>>(Configuration.GetSection("GameSettings"));
IOptions<List<GameSettingOptions>>

3. 对于控制器，我尝试对 IOptions 值执行 foreach，但它说 GameSetingsOptions 敌人不包含公共实例或“GetEnumerator”的定义

解决方法

请定义GameSettingsOtions，如下所示

public class GameSettingOptions: List<GameSetting>
{
}

public class GameSetting
{
    public int gameId { get; set; }
    public string iconSize { get; set; }
    public int sortOrder { get; set; }
    public string[] chips { get; set; }
}

现在来配置它，使用下面的代码 ConfigureServices 方法：

services.Configure<GameSettingOptions>(options => Configuration.GetSection("GameSettings").Bind(options));

上面你可以看到定义的选项被注入。这是我调试的截图：

这是我的 appsettings.json 文件以供参考：

{
    "Logging": {
        "LogLevel": {
            "Default": "Information","Microsoft": "Warning","Microsoft.Hosting.Lifetime": "Information"
        }
    },"AllowedHosts": "*","MySettings": {
        "SettingValue": 2
    },"GameSettings": [
        {
            "gameId": 1,"iconSize": "big","sortOrder": 6
        },{
            "gameId": 2,"iconSize": "small","sortOrder": 4
        },{
            "gameId": 3,"iconSize": "medium","sortOrder": 2
        },{
            "gameId": 4,"sortOrder": 5
        },{
            "gameId": 5,"sortOrder": 8,"chips": []
        },{
            "gameId": 6,"sortOrder": 7
        },{
            "gameId": 7,"sortOrder": 1,"chips": []
        }
    ]
}