[英]How to pass a callback parameter to my service class with IServiceCollection in C#?
首先,我想為我糟糕的英語道歉,因為我是中國人。 我現在會盡力描述我的問題。 如果您能耐心地閱讀本文並給我一些建議,將不勝感激。
我將使用Microsoft.AspNetCore
開發一個 Web 應用程序。 有一個子項目,其中包含名為MyService
的服務 class 和用於將MyService
添加到WebHostBuilder
的ServiceCollectionExtensions
。
public class MyService: IMyService
{
public MyService(IHttpContextAccessor httpContextAccessor, Func<RequestContext> callBack = null)
{
_httpContextAccessor = httpContextAccessor;
_callBack = callBack;
}
}
public static class ServiceCollectionExtensions
{
public static IServiceCollection AddMyService(this IServiceCollection services, Func<RequestContext> callBack = null)
{
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
// TODO: pass callBack function to the constructor of MyService
return services.AddScoped<IMyService, MyService>();
}
}
所以我的問題是如何將callBack參數傳遞給MyService
class的構造函數?
addScoped 方法有一些重載,其中一個是創建服務實例的工廠,因此您可以使用該重載並傳入您創建的工廠,並在工廠定義中添加傳遞您的服務構造函數中的回調。 You will find more details here https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.dependencyinjection.servicecollectionserviceextensions.addscoped?view=aspnetcore-3.0#Microsoft_Extensions_DependencyInjection_ServiceCollectionServiceExtensions_AddScoped_Microsoft_Extensions_DependencyInjection_IServiceCollection_System_Type_System_Func_System_IServiceProvider_System_Object__
編寫擴展方法如下:
public static class ServiceCollectionExtensions
{
public static IServiceCollection AddMyService(this IServiceCollection services, Func<RequestContext> callBack = null)
{
services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
services.AddScoped<IMyService, MyService>(sp => new MyService(new HttpContextAccessor(), new Func<RequestContext>(target)));
return services;
}
}
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