.Net Core ActionFilter

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所属分类：.NET技术
摘要

执行顺序为:
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作用

  • 在请求AuthorizeFilter -> ResourceFilter -> ActionFilter, 可以Action的日志
  • ActionFilter 在控制器实例化之后执行
  • ResourceFilter 可以在全局, Controller, Action 都可以设置, 并且都会执行(一个ResourceFilter可以重复设置)

执行顺序为:

  1. 全局
  2. Controller
  3. Action
  4. Action 方法
  5. Action
  6. Controller
  7. 全局

实现

IActionFilter

  1. 需要继承 Attribute 并 并实现 IActionFilter
  2. 实现接口方法
  • 执行顺序为:
  1. OnActionExecuting
  2. Action
  3. OnActionExecuted

IAsyncActionFilter

  1. 需要继承 Attribute 并 并实现 IAsyncActionFilter
  2. 实现接口方法
  3. 该接口只提供一个 OnActionExecutionAsync方法,如果想执行ActionExecutedContext方法,需要执行方法中ActionExecutionDelegate委托并取返回值然后代码在执行为ActionExecutedContext方法
  • 执行顺序为:
  1. OnActionExecuting
  2. Action
  3. OnActionExecuted

ActionFilterAttribute

  1. 需要继承 ActionFilterAttribute
  2. 重写 OnActionExecuting OnActionExecuted OnResultExecuting OnResultExecuted 方法
  • 执行顺序为:
  1. OnActionExecuting
  2. Action
  3. OnActionExecuted
  4. OnResultExecuting
  5. OnResultExecuted

Demo

CustomAsyncActionFilter.cs

using Microsoft.AspNetCore.Mvc.Filters; namespace Cnpc.Com.Ioc.WebApp.Filter.ActionFilter {     public class CustomAsyncActionFilter : Attribute, IAsyncActionFilter     {         public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)         {             {                 Console.WriteLine("ActionExecutingContext.....");             }             ActionExecutedContext executed = await next();             {                 Console.WriteLine("ActionExecutedContext.....");             }         }     } }

TestFilterController.cs

using Cnpc.Com.Ioc.WebApp.Filter; using Microsoft.AspNetCore.Mvc;  namespace Cnpc.Com.Ioc.WebApp.Controllers {     [Route("api/[controller]/[action]")]     [ApiController]     public class TestFilterController : ControllerBase     {         //[TypeFilter(typeof(CustomAsyncActionFilter))]  如果想在ActionFilter支持Nlog 并使用构造注入就这样写         [CustomAsyncActionFilter]         [HttpGet]         public async Task Action_AsyncActionFilter()         {             Console.WriteLine("Func...");             await Task.CompletedTask;         }     } }

如何在Actionfilter使用日志

Action.cs

//[ServiceFilter(typeof(CustomAsyncActionFilter))] 如果使用SerciceFilter 要先将CustomAsyncActionFilter 注册到ioc中 [TypeFilter(typeof(CustomAsyncActionFilter))] //如果想在ActionFilter支持Nlog 并使用构造注入就这样写 [HttpGet] public async Task Action_AsyncActionFilter() {     Console.WriteLine("Func...");     await Task.CompletedTask; }

CustomAsyncActionFilter.cs

using Cnpc.Com.Ioc.IBll; using Cnpc.Com.Ioc.IDal; using Microsoft.AspNetCore.Mvc.Filters;  namespace Cnpc.Com.Ioc.WebApp.Filter.ActionFilter {     public class CustomAsyncActionFilter : Attribute, IAsyncActionFilter     {          ILogger<CustomAsyncActionFilter> logger { get; set; }         IStudent student { get; set; }         IWrite write { get;set; }         public CustomAsyncActionFilter(ILogger<CustomAsyncActionFilter> logger,IStudent student,IWrite write)         {             this.logger = logger;             this.student = student;             this.write = write;         }          public async Task OnActionExecutionAsync(ActionExecutingContext context, ActionExecutionDelegate next)         {             {                 Console.WriteLine("ActionExecutingContext.....");                 logger.LogInformation(context.HttpContext.Request.Path + "before..");                 this.student.DoHomeWork(write);             }             ActionExecutedContext executed = await next();             {                 Console.WriteLine("ActionExecutedContext.....");                 logger.LogInformation(context.HttpContext.Request.Path + "after..");             }         }     } }

全局注册

Program.cs

//全局注册 builder.Services.AddControllersWithViews(options => {     options.Filters.Add<CustomAsyncActionFilter>(); });
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