ASP.NET Core Filter如何支持依赖注入

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;
        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)        { }    }

https://gitee.com/conanOpenSource_admin/service-filter_-type-filter

标签：Core,ASP,Filter,typeof,context,TestActionFilterAttribute,logger,public
来源： https://www.cnblogs.com/yakniu/p/16669712.html