Filter的注入方式 NET Core

1全局注册

2ServiceFilter (要记得ConfigureService)

3TypeFilte

对于ActionFilter这类有进有出的filter

执行顺序  全局Executing->控制器Executing->Action的Executing->Action的Executed->控制器Executed->全局Executed

1全局注册 

 public class ExceptionFilter : IExceptionFilter
    {
        public void OnException(ExceptionContext context)
        {
            if (!context.ExceptionHandled)
            {
                Console.WriteLine($"你没处理列{context.HttpContext.Request.Path}{context.Exception.Message}");
                context.Result = new JsonResult(new { Result = false, Msg = "异常，请联系管理员" });
                context.ExceptionHandled = true;//表示异常已经处理
            }
        }
    }

//然后在Startup的ConfigureServices中注册
 public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews(
                s =>
                {
                    s.Filters.Add(typeof(ExceptionFilter));
                }
                );
        ｝

还可以定义ExceptionFilterAttribute自己决定放在全局、控制器、Action方法

 public class CustomExceptionFilterAttribute : ExceptionFilterAttribute
    {
        /// <summary>
        /// 当异常的发生时会进来
        /// </summary>
        /// <param name="context"></param>
        public override void OnException(ExceptionContext context)
        {
            if (!context.ExceptionHandled)
            {
                Console.WriteLine($"你没处理列{context.HttpContext.Request.Path}{context.Exception.Message}");
                context.Result = new JsonResult(new  { Result=false,Msg="异常，请联系管理员"});
                context.ExceptionHandled = true;//表示异常已经处理
            }
        }
    }

Filter特性放在Action方法上给该Action方法注册

  [CustomExceptionFilterAttribute]
        public IActionResult Index()

给控制器注册

[CustomExceptionFilterAttribute]
    public class AopController : Controller

全局注册

    public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllersWithViews(
                s =>
                {
                    s.Filters.Add(typeof(CustomExceptionFilterAttribute));//全局注册
                    //s.Filters.Add(typeof(ExceptionFilter));
                }
                );
}

2 ServiceFilter (要记得ConfigureService) 

  [ServiceFilter(typeof(CustomExceptionFilterAttribute))]
        public IActionResult Index()

//在ConfigureServices中单独注册
   services.AddSingleton<CustomExceptionFilterAttribute>();

3TypeFilter 

  [TypeFilter(typeof(CustomExceptionFilterAttribute))]
        public IActionResult Index()