[Asp.Net Core]Filter的生效范围和执行顺序

Posted 2022-01-05 厦门德仔

Filter的生效范围和执行顺序

1.标记在Action上，就只对当前Action生效

2.标记在Controller上，就对Controller上中的所有Action生效

3.全局注册，对于当前整个项目中的Action都生效，在ConfigureServices中增加以下代码即可

如果有三个actionFilter，分别注册全局，控制器、Action;执行顺序如何呢？
定义三个ActionFilter，分别注册全局，控制器，Action
执行顺序如下：
1.控制器实例化
2.全局注册的Filter-OnActionExecuting
3.控制器注册的Filter-OnActionExecuting

            services.AddMvc(option=> 
                //option.Filters.Add<CustomActionFilterAttribute>();
                option.Filters.Add<CustomGlobalActionFilterAtrribute>();
            );

4.Actioin注册的Filter-OnActionExecuting
5.执行Action内部的逻辑算计
6.Action注册的Filter-OnActionExecuted
7.控制器注册的Filter-OnActionExecuted
8.全局注册的Filter-OnActionExecuted
俄罗斯套娃~
执行顺序不能改吗？ 能改，在注册Filter的时候，指定Order的值，执行顺序，按照Order的值，从小到大执行；例如：[CustomActionActionFilterAtrribute(Order = -1)]
Filter:

    public class CustomGlobalActionFilterAtrribute : ActionFilterAttribute
    
        public override void OnActionExecuting(ActionExecutingContext context)
        
            Console.WriteLine("CustomGlobalActionFilterAtrribute.OnActionExecuting");
        

        public override void OnActionExecuted(ActionExecutedContext context)
        
            Console.WriteLine("CustomGlobalActionFilterAtrribute.OnActionExecuted");
        
    


    public class CustomControllerActionFilterAtrribute : ActionFilterAttribute
    
        public override void OnActionExecuting(ActionExecutingContext context)
        
            Console.WriteLine("CustomControllerActionFilterAtrribute.OnActionExecuting");
        

        public override void OnActionExecuted(ActionExecutedContext context)
        
            Console.WriteLine("CustomControllerActionFilterAtrribute.OnActionExecuted");
        
    

    public class CustomActionActionFilterAtrribute : ActionFilterAttribute
    
        public override void OnActionExecuting(ActionExecutingContext context)
        
            Console.WriteLine("CustomActionActionFilterAtrribute.OnActionExecuting");
        

        public override void OnActionExecuted(ActionExecutedContext context)
        
            Console.WriteLine("CustomActionActionFilterAtrribute.OnActionExecuted");
        
    

测试