如何在一个界面中使用多个部分 asp.net core 6？

Question

我的 appsettings.json 文件中有多个部分在 ASP.NET Core 6 应用程序中。

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  "AllowedHosts": "*",
  "OracleSettings": {
    "Host": "host.com",
    "Port": "1521"
  },
  "ElasticSettings": {
    "Hosts": "elastic.com"
  },
  "RedisSettings": {
    "Ip": "redis.com",
    "Timeout": 1,
    "Duration": 50
  }  
}

而且我已经为部分创建了类。

public class OracleSettings
{
    public string Host { get; set; }
    public string Port { get; set; }
}

public class ElasticSettings
{
    public string Hosts { get; set; }
}

public class RedisSettings
{
    public string Ip { get; set; }
    public int Timout { get; set; }
    public int Duration { get; set; }
}

我只想使用一个名为 IApplciationSettings.

的界面访问所有设置

public interface IApplciationSettings
{
    OracleSettings OracleSettings { get; set; }
    ElasticSettings ElasticSettings { get; set; }
    RedisSettings RedisSettings { get; set; }
}

添加构建器服务：

builder.Services.Configure<ElasticSettings>(builder.Configuration.GetSection(nameof(ElasticSettings)));
builder.Services.Configure<OracleSettings>(builder.Configuration.GetSection(nameof(OracleSettings)));
builder.Services.Configure<RedisSettings>(builder.Configuration.GetSection(nameof(RedisSettings)));

所以我想将所有配置绑定到 IApplciationSettings 接口，并在构造函数依赖注入中使用它，如下所示：

[Route("api/[controller]")]
[ApiController]
public class ProductController : ControllerBase
{
    readonly IProductService productService;

    public PoructController(
        IApplciationSettings settings, IProductService productService)
    {
        this.productService = productService;
        
        var oraclesetting = settings.OracleSettings;
    }
}

我该怎么做？

Answer 1

您可以根据您的 IApplicationSettings 创建您的 Class，并在程序中编写：

builder.Services.Configure<ApplicationSettings>(builder.Configuration);

然后在你的构造函数中你

[Route("api/[controller]")]
[ApiController]
public class ProductController : ControllerBase
{
    readonly IProductService productService;

    public PoructController(IOptions<ApplicationSettings> settings, IProductService productService)
    {
        this.productService = productService;
        
        var oraclesetting = settings.Value.OracleSettings;
    }
}

Answer 2

假设有IApplciationSettings

的具体实现

public class ApplciationSettings : IApplciationSettings {
    public OracleSettings OracleSettings { get; set; }
    public ElasticSettings ElasticSettings { get; set; }
    public RedisSettings RedisSettings { get; set; }
}

直接从配置中提取设置并将其添加到依赖注入服务容器。

//...

ApplciationSettings settings = builder.Configuration.Get<ApplciationSettings>();

if(settings == null) throw new Exception("message here"); //fail early

builder.Services.AddSingleton<IApplciationSettings>(settings);

//...

ConfigurationBinder.Get<T> 扩展方法绑定并 returns 指定类型。

Attempts to bind the configuration instance to a new instance of type T. If this configuration section has a value, that will be used. Otherwise binding by matching property names against configuration keys recursively.

这将允许 IApplciationSettings 根据需要注入，而不必与 IOptions 紧密耦合。

引用Bind hierarchical configuration

如何在一个界面中使用多个部分 asp.net core 6？

How to use multiple sections in one interface asp.net core 6?

c#

dependency-injection

.net-core

asp.net-core

asp.net-core-6.0