IAsyncActionFilter写日志

1、配置log4net查看

https://www.cnblogs.com/handsomeziff/p/16213689.html

2、创建类CustomAsyncActionFilterAttribute继承Attribute, IAsyncActionFilter

using Microsoft.AspNetCore.Mvc.Filters;

namespace Project6.Utility.Filters
{
    public class CustomAsyncActionFilterAttribute : Attribute, IAsyncActionFilter
    {
        private readonly ILogger<CustomAsyncActionFilterAttribute> _logger;

        public CustomAsyncActionFilterAttribute(ILogger<CustomAsyncActionFilterAttribute> logger)
        {
            _logger = logger;
        }
        public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)
        {
            var controllerName = context.HttpContext.GetRouteValue("controller");
            var actionName = context.HttpContext.GetRouteValue("action");
            var para = context.HttpContext.Request.QueryString.Value;
            _logger.LogInformation($"执行{controllerName} - {actionName}方法:参数为:{para}");

            //去执行控器里面的Action
            ActionExecutedContext executedContext = await next.Invoke();

            var result = Newtonsoft.Json.JsonConvert.SerializeObject(executedContext.Result);
            _logger.LogInformation($"执行{controllerName} - {actionName}方法:结果为:{result}");
        }
    }
}

3、创建控制器CustomAsyncActionFilterController

using Microsoft.AspNetCore.Mvc;
using Project6.Utility.Filters;

namespace Project6.Controllers
{
    public class CustomAsyncActionFilterController : Controller
    {
        public CustomAsyncActionFilterController()
        {
            Console.WriteLine("控制器构造函数");
        }

        [TypeFilter(typeof(CustomAsyncActionFilterAttribute))]
        //[ServiceFilter(typeof(CustomActionFilterAttribute))]
        public IActionResult Index(int id)
        {
            ViewBag.user = Newtonsoft.Json.JsonConvert.SerializeObject(new
            {
                Id = id,
                Name = "ViewBag"
            });
            ViewData["UserInfo"] = Newtonsoft.Json.JsonConvert.SerializeObject(new
            {
                Id = id + 1,
                Name = "ViewData"
            });

            object description = "描述信息";
            return View(description);
        }
    }
}

4、在各个方法处设置断点，运行/CustomAsyncActionFilter?id=1

可以发现程序的执行顺序CustomAsyncActionFilterAttribute构造方法-->

CustomAsyncActionFilterController构造方法-->

CustomAsyncActionFilterAttribute.OnActionExecutionAsync方法-->

执行到ActionExecutedContext executedContext = await next.Invoke();跳到控制器的Action方法CustomAsyncActionFilterController.Index-->

控制器Action方法执行完后，继续执行上一步代码之后的内容