.Net Core Aop之IResourceFilter的具体使用

public class CustomerResourceFilterAttribute : Attribute, IResourceFilter
    {
        private static Dictionary<string,object> cacheDic=new Dictionary<string, object>();
        public void OnResourceExecuting(ResourceExecutinGContext context)
        {
            var path=context.HttpContext.Request.Path; 
            if (cacheDic.ContainsKey(path))
            {
                context.Result = (IActionResult)cacheDic[path];
            }
            Console.WriteLine("CustomerResourceFilterAttribute.OnResourceExecuting");
        }
        public void OnResourceExecuted(ResourceExecutedContext context)
        {
            var path = context.HttpContext.Request.Path;
            cacheDic[path] = context.Result;
            Console.WriteLine("CustomerResourceFilterAttribute.OnResourceExecuted");
        }

        
    }

public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;

        public HomeController(ILogger<HomeController> logger)
        {
            _logger = logger;
            Console.WriteLine($"执行 {this.GetType().Name} 构造函数");
        }

        [CustomerResourceFilter]
        public IActionResult Index()
        {
            ViewBag.Data = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss");
            return View();
        }
    }

@{
    ViewData["Title"] = "Home Page";
}


<h3>来自于控制器的结果：@ViewBag.Data</h3>
<h3>来自于页面的结果：@DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss")</h3>

public class CustomerAsyncResourceFilterAttribute : Attribute, IAsyncResourceFilter
    {
        private static Dictionary<string, object> cacheDic = new Dictionary<string, object>();
        public async Task OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next)
        {
            Console.WriteLine("CustomerResourceFilterAttribute.OnResourceExecutionAsync Before");

            var path = context.HttpContext.Request.Path;
            if (cacheDic.ContainsKey(path))
            {
                context.Result = (IActionResult)cacheDic[path];
            }
            else
            {
                ResourceExecutedContext resource =await next.Invoke();
                cacheDic[path] = resource.Result; // 这句话的执行就是去执行控制器的构造函数+Action
                Console.WriteLine("CustomerResourceFilterAttribute.OnResourceExecutionAsync After");
            }
            

        }
    }