从appsettings获取值。.net core中的Json

不确定我在这里错过了什么，但我无法从我的应用程序设置中获得值。Json在我的。net核心应用程序。我有我的appsettings。json:

{
    "AppSettings": {
        "Version": "One"
    }
}

启动:

public class Startup
{
    private IConfigurationRoot _configuration;
    public Startup(IHostingEnvironment env)
    {
        _configuration = new ConfigurationBuilder()
    }
    public void ConfigureServices(IServiceCollection services)
    {
      //Here I setup to read appsettings        
      services.Configure<AppSettings>(_configuration.GetSection("AppSettings"));
    }
}

模型:

public class AppSettings
{
    public string Version{ get; set; }
}

控制器:

public class HomeController : Controller
{
    private readonly AppSettings _mySettings;

    public HomeController(IOptions<AppSettings> settings)
    {
        //This is always null
        _mySettings = settings.Value;
    }
}

_mySettings总是空的。我是不是遗漏了什么?

当前回答

花了一个小时试图解决同样的问题，我的解决方案是为appconfig添加PreserveNewest/CopyAlways。csproj中的Json

<None Update="appsettings.json">
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>

2022-01-13 10:51:49

其他回答

我发现用。net Core 3+最容易做到以下几点。我发现所有使用HostBuilders等的其他方法都有点啰嗦，而且可读性不强。这不是专门针对ASP的。但是你可以调整它…

这里有一个工作示例:https://github.com/NotoriousPyro/PyroNexusTradingAlertBot/blob/develop/PyroNexusTradingAlertBot/Program.cs

创建json:

{
"GlobalConfig": {
    "BlacklistedPairs": [ "USD", "USDT", "BUSD", "TUSD", "USDC", "DAI", "USDK" ]
},
"CoinTrackingConfig": {
    "Cookie1": "",
    "Cookie2": "",
    "ApiKey": "",
    "ApiSecret": "",
    "UpdateJobs": [
    {
        "Name": "Binance",
        "Path": "binance_api",
        "JobId": 42202
    },
    {
        "Name": "Bitfinex",
        "Path": "bitfinex_api",
        "JobId": 9708
    }
    ]
},
"DiscordConfig": {
    "BotToken": ""
}
}

创建json对象的类:

class GlobalConfig
{
    public string[] BlacklistedPairs { get; set; }
}
class CoinTrackingConfig
{
    public string Cookie1 { get; set; }
    public string Cookie2 { get; set; }
    public string ApiKey { get; set; }
    public string ApiSecret { get; set; }
    public List<CoinTrackingUpdateJobs> UpdateJobs { get; set; }
}

class CoinTrackingUpdateJobs
{
    public string Name { get; set; }
    public string Path { get; set; }
    public int JobId { get; set; }
}

class DiscordConfig
{
    public string BotToken { get; set; }
}

创建一个helper类:

private class Config
{
    private IConfigurationRoot _configuration;
    public Config(string config) => _configuration = new ConfigurationBuilder()
            .AddJsonFile(config)
            .Build();

    public T Get<T>() where T : new()
    {
        var obj = new T();
        _configuration.GetSection(typeof(T).Name).Bind(obj);
        return obj;
    }
}

服务提供者选项和服务构造函数:

public class DiscordServiceOptions
{
    public string BotToken { get; set; }
}

public DiscordService(IOptions<DiscordServiceOptions> options, ILogger<DiscordService> logger)
{
    _logger = logger;
    _client = new DiscordSocketClient();
    _client.Log += Log;
    _client.Ready += OnReady;
    _client.Disconnected += OnDisconnected;
    _client.LoginAsync(TokenType.Bot, options.Value.BotToken);
    _client.StartAsync();
}

像这样初始化它(将配置传递给服务提供者- IOptions将在服务构建时传递进来):

static async Task Main(string[] args)
{
    var _config = new Config("config.json");

    var globalConfig = config.Get<GlobalConfig>();
    var coinTrackingConfig = config.Get<CoinTrackingConfig>();
    var discordConfig = config.Get<DiscordConfig>();

    _services = new ServiceCollection()
        .AddOptions()
        .Configure<DiscordServiceOptions>(options =>
        {
            options.BotToken = discordConfig.BotToken;
        })
        .AddSingleton<IDiscordService, DiscordService>()
        .AddLogging(logging =>
        {
            logging.SetMinimumLevel(LogLevel.Trace);
            logging.AddNLog(new NLogProviderOptions
            {
                CaptureMessageTemplates = true,
                CaptureMessageProperties = true
            });
        })
        .BuildServiceProvider();
}

2021-03-01 18:11:22

appsetting.json

{   
  "Settings": {      
    "ProjectName": "Sample Project"   
  }
}

定义一个具有相同属性名的类:

 public class Settings
 {
     public string ProjectName { get; set; }  
 }

在Startup.cs中添加配置:

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<Settings>(Configuration.GetSection("Settings")); 
}

注入控制器:

public class TestController : Controller
{
    private readonly Settings _settings;       
    
    public TestController(IOptions<Settings> settings)
    {
         _settings = settings.Value;
    }
       
    [AllowAnonymous]
    public async Task<IActionResult> test()
    {
        var _projectname = _settings.ProjectName;
                
        return View();
    }
}

2021-11-29 06:36:19

花了一个小时试图解决同样的问题，我的解决方案是为appconfig添加PreserveNewest/CopyAlways。csproj中的Json

<None Update="appsettings.json">
  <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
</None>

2022-01-13 10:51:49

像这样在这里添加所需的键。在这种情况下，它的securecookie:

在startup.cs中添加构造函数公共启动(IConfiguration配置) ｛配置=配置; ｝ public IConfiguration Configuration {get;｝使用Configuration[" secucookie "]访问设置

2021-01-08 06:30:57

如果以上解决方案没有帮助，您可以参考此链接。对我来说，命名选项支持使用IConfigureNamedOptions工作!你可能还会发现其他方法可能对你有帮助。

使用IConfigureNamedOptions支持命名选项

2022-11-01 07:04:14

从appsettings获取值。.net core中的Json

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