如何修復 .NET Core 中 Startup.cs 類中的依賴注入錯誤

Question

我使用 ASP.NET Core 2.2 我試圖從 Startup 調用基本服務類。 它拋出這個異常：

InvalidOperationException：嘗試激活“AdminCentral.NetCore.Startup”時無法解析“TIR.NetCore.ICommonLogService”類型的服務。

這是我的代碼：

public class Startup
{
    private readonly ICommonLogService _CommonLogService;
    public Startup(IConfiguration configuration, ICommonLogService CommonLogService)
    {
         _CommonLogService = CommonLogService;
         Configuration = configuration;
    }

    public IConfiguration Configuration { get; }
    public string connectionString;

    public IServiceProvider ConfigureServices(IServiceCollection services)
    {
        var container = new Container();
        container.Configure(config =>
        {
            config.AddRegistry(new StructuremapRegistry());
            config.Populate(services);
        });

        return container.GetInstance<IServiceProvider>();
    }
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
      LogException(Exception )
   }

    private void LogException(Exception error, HttpContext context)
    {
         _CommonLogService.InsertLogDetail();
  }
}

Answer 1

如果你想在Startup.cs類中使用ICommonLogService ，你需要像這樣從容器中獲取一個實例：

public IServiceProvider ConfigureServices(IServiceCollection services)
{
     var container = new Container();
     container.Configure(config =>
     {
         config.AddRegistry(new StructuremapRegistry());
         config.Populate(services);
     });

     //Get an instance of ICommonLogService from container
     ICommonLogService CommonLogService = container.GetInstance<ICommonLogService>();
     //Use CommonLogService here

     return container.GetInstance<IServiceProvider>();
}