c# - ASP.NET Core - 如何注入 IOptionsMonitor

Question

如何注入IOptionsMonitor<T[]>控制器？

在 appsettings.json

{
      "MyArray": [
       {
          "Name": "Name 1",
          "SomeValue": "Value 1",
       },
       {
          "Name": "Name 2",
          "SomeValue": "Value 2",
       }
      ]
}

在 Startup.cs

public void ConfigureServices(IServiceCollection services)
{
     services.AddOptions();
     services.Configure<MyOptions[]>(Configuration.GetSection("MyArray"));
}

在 HomeController

public class HomeController : Controller
{
    private readonly MyOptions[] myOptions;
    public HomeController(IOptionsMonitor<MyOptions[]> myOptions)
    {
        this.myOptions = myOptions.CurrentValue;
    }
}

我得到了 Unable to resolve service for type 'Microsoft.Extensions.Options.IOptionsMonitor`1[MyOptions[]]' while attempting to activate 'Api.Controllers.HomeController'.例外。

我可以通过它访问配置configuration.GetSection("MyArray").Get<MyOptions[]>()并且它可以工作，但我想将它作为构造函数参数注入。

标签： c#asp.net-coreasp.net-core-mvcasp.net-core-webapi

Answer 1

您需要创建一个具有MyOptions[]属性的类并注入该类并添加不带部分的整个配置。

public class Options
{
    public MyOptions[] MyArray { get; set; }
}

启动.cs

public void ConfigureServices(IServiceCollection services)
{
     services.AddOptions();
     services.Configure<Options>(Configuration);
}

家庭控制器.cs

public class HomeController : Controller
{
    private readonly MyOptions[] myOptions;
    public HomeController(IOptionsMonitor<Options> myOptions)
    {
        this.myOptions = myOptions.CurrentValue.MyArray;
    }
}