如何将 LoggerFactory 的实例传递给 ActionFilterAttribute

Question

美好的一天。

我正在尝试通过在我的自定义 ActionFilterAttribute 类中注入 LoggerFactory 来使用日志记录，但是在控制器方法之一中使用 Attribute 时，我收到一条错误消息

[CS7036] There is no argument given that corresponds to the required formal parameter 'logger' of 'Tracker.Tracker(ILoggerFactory)' 

下面是这个类的实现：

using System;

using Microsoft.AspNetCore.Mvc.Filters;

using Microsoft.EntityFrameworkCore;

using Microsoft.AspNetCore.Identity;

using Microsoft.Extensions.Logging;

namespace ImmoSales.Tracking

{

    public class Tracker : ActionFilterAttribute

    {

        public string ActionType { get; set; }

        public string ActionName { get; set; }

        private readonly ILoggerFactory _logger;

        public Tracker(ILoggerFactory logger)

        {

            _logger = logger;

        }

        public override void OnActionExecuting(ActionExecutingContext context)

        {

            base.OnActionExecuting(context);

        }

        public override void OnActionExecuted(ActionExecutedContext context)

        {

            base.OnActionExecuted(context);

        }

        public override void OnResultExecuting(ResultExecutingContext context)

        {

            base.OnResultExecuting(context);

        }

        public override void OnResultExecuted(ResultExecutedContext context)

        {

            base.OnResultExecuted(context);

        }

    }

}

当我尝试在控制器中使用跟踪器时出现上述错误，如下所示：

[Tracker(ActionType="testType", ActionName="testName")]

public IActionResult Index()

{

    return View();

}

可以做些什么来修复错误？

Answer 1

由于您正在操作过滤器中进行构造函数注入，因此您可以使用ServiceFilter属性启用它，您可以在其中传递过滤器的类型[ServiceFilter(typeof(Tracker))]public IActionResult Index(){&nbsp; &nbsp; // to do : return something}确保您已在ConfigureServices方法中注册过滤器services.AddScoped<Tracker>();如果要将其他参数传递给过滤器，可以更新过滤器构造函数以包含这些参数。public class Tracker : ActionFilterAttribute{&nbsp; &nbsp; private string _actionType { get; set; }&nbsp; &nbsp; private string _actionName { get; set; }&nbsp; &nbsp; private readonly ILoggerFactory _logger;&nbsp; &nbsp; public Tracker(ILoggerFactory logger, string actionType, string actionName)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; this._logger = logger;&nbsp; &nbsp; &nbsp; &nbsp; this._actionName = actionName;&nbsp; &nbsp; &nbsp; &nbsp; this._actionType = actionType;&nbsp; &nbsp; }&nbsp; &nbsp; public override void OnActionExecuting(ActionExecutingContext context)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; base.OnActionExecuting(context);&nbsp; &nbsp; }&nbsp; &nbsp; public override void OnActionExecuted(ActionExecutedContext context)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; base.OnActionExecuted(context);&nbsp; &nbsp; }&nbsp; &nbsp; public override void OnResultExecuting(ResultExecutingContext context)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; base.OnResultExecuting(context);&nbsp; &nbsp; }&nbsp; &nbsp; public override void OnResultExecuted(ResultExecutedContext context)&nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; base.OnResultExecuted(context);&nbsp; &nbsp; }}并使用TypeFilter属性来启用您的过滤器，您可以在其中显式传递参数[TypeFilter(typeof(Tracker), Arguments = new object[] { "Abc", "Xyz" })]public IActionResult Index(){&nbsp; &nbsp; // to do : return something}