• .NET Core Filter如何支持依赖注入?
  • 发布于 2个月前
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通过Filter来支持;分别有IResourceFilter AuthorizeFilter ActionFilter ExceptionFilter ResultFilter,Filter也被称为拦截器。

那么 ASP.NET Core Filter如何支持依赖注入?可以通过全局注册,支持依赖注入。通过TypeFilter(typeof(Filter)) 标记在方法,标记在控制器。通过ServiceType(typeof(Filter))标记在方法,标记在控制器,必须要注册Filter这类;TypeFilter和ServiceType的本质是实现了一个IFilterFactory接口;

代码如下:
   public class HomeController : Controller
    {
        private readonly ILoggerFactory _loggerFactory;
        // 堆代码 duidaima.com
        public HomeController(ILoggerFactory factory)
        {
            _loggerFactory = factory;
        }

        //[TestActionFilter]
        //  [TypeFilter(typeof(TestActionFilterAttribute))]
        //  [ServiceFilter(typeof(TestActionFilterAttribute))]
        public IActionResult Index()
        {
            return View();
        }

        public IActionResult Privacy()
        {
            return View();
        }

    public class TestActionFilterAttribute : Attribute, IActionFilter
    {
        private readonly ILogger _logger;

        public TestActionFilterAttribute(ILoggerFactory logger)
        {
            _logger = logger.CreateLogger("TestActionFilterAttribute");
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
            _logger.LogDebug($"11111");

            if (context.HttpContext.Request.Query.TryGetValue("id", out StringValues value))
            {
                Console.WriteLine(value.First());
            }
            else
            {
                context.HttpContext.Response.Redirect("/Error/404");
            }
        }

        public void OnActionExecuting(ActionExecutingContext context)
        { }
    }

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