IAlwaysRunResultFilter

1、IResourceFilter设置context.Result后，程序不在往后执行，可以利用这个特性来做页面缓存，查看
https://www.cnblogs.com/handsomeziff/p/16215572.html

当需要在context.Result后对结果在做一些处理，可以利用IAlwaysRunResultFilter

2、新建类CustomAlwayRunResultFilterAttribute继承Attribute, IAlwaysRunResultFilter

using Microsoft.AspNetCore.Mvc.Filters;

namespace Project6.Utility.Filters
{
    public class CustomAlwayRunResultFilterAttribute : Attribute, IAlwaysRunResultFilter
    {
        public void OnResultExecuted(ResultExecutedContext context)
        {
            Console.WriteLine("OnResultExecuted");
        }

        public void OnResultExecuting(ResultExecutingContext context)
        {
            Console.WriteLine("OnResultExecuting");
        }
    }
}

3、新建控制器CustomAlwaysRunResultController

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

namespace Project6.Controllers
{
    public class CustomAlwaysRunResultController : Controller
    {
        [CustomResourceFilterAttribute]
        [CustomAlwayRunResultFilterAttribute]
        public IActionResult Index()
        {
            return Json(new
            {
                Id = 123,
                Name = "net"
            });
        }
    }
}

4、在各个方法处设置断点，执行/CustomAlwaysRunResult

可以发现在程序在返回结果前都要执行CustomAlwayRunResultFilterAttribute里面的OnResultExecuting和OnResultExecuted