.net core(.net 6) IResourceFilter 的基础使用（IAsyncResourceFilter）

a 定义CustomResourceFilterAttribute扩展类，继承父类Attribute,实现 IResourceFilter接口

b 实现接口方法

c 标记在API action上

1、CustomResourceFilterAttribute扩展类

Attribute类为标记类。

IResourceFilter接口包括OnResourceExecuted、OnResourceExecuting两个方法；OnResourceExecuting在API执行前执行，OnResourceExecuted在API执行后执行。

using Microsoft.AspNetCore.Mvc.Filters;
using System;

namespace Demo02.Utility.Filters
{
    /// <summary>
    /// 自定义ResourceFilter标记类
    /// </summary>
    public class CustomResourceFilterAttribute : Attribute, IResourceFilter
    {
        /// <summary>
        /// API执行后 执行
        /// </summary>
        /// <param name="context"></param>
        /// <exception cref="NotImplementedException"></exception>
        public void OnResourceExecuted(ResourceExecutedContext context)
        {
            Console.WriteLine("======执行CustomResourceFilterAttribute.OnResourceExecuted====");
        }

        /// <summary>
        /// API执行前 执行
        /// </summary>
        /// <param name="context"></param>
        /// <exception cref="NotImplementedException"></exception>
        public void OnResourceExecuting(ResourceExecutingContext context)
        {
            Console.WriteLine("======执行CustomResourceFilterAttribute.OnResourceExecuting====");
        }
    }
}

2、在action上标记并测试

在action上标记‘CustomResourceFilterAttribute‘,Attribute可省。

using Demo02.Model;
using Demo02.Utility.Filters;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;

namespace Demo02.Controllers
{
    /// <summary>
    /// Filters
    /// </summary>

    [ApiVersion("1.0")]
    [Route("[controller]/V{version:apiVersion}")]
    [ApiController]
    public class FiltersController : ControllerBase
    {
        private readonly ILogger<FiltersController> _logger;

        /// <summary>
        /// 构造函数
        /// </summary>
        /// <param name="logger">控制台日志</param>
        public FiltersController(ILogger<FiltersController> logger)
        {
            _logger = logger;
        }

        /// <summary>
        /// GET AOP测试 ResourceFilter
        /// </summary>
        /// <returns></returns>
        [HttpGet()]
        [Route("ResourceFilter/CustomResourceFilter")]
        [CustomResourceFilter]
        public IActionResult GetString()
        {
            return new JsonResult(new ApiResut<String>()
            {
                Success = true,
                Data = "AOP ResourceFilter 测试",
                Time = DateTime.Now.ToString()

            });
        }
     
    }
}

执行测试：

3、IAsyncResourceFilter（异步）

IAsyncResourceFilter，实现步骤同IResourceFilter，只是接口不同实现方法不同。

CustomAsyncResourceFilterAttribute 类

using Microsoft.AspNetCore.Mvc.Filters;
using System;

namespace Demo02.Utility.Filters
{
    /// <summary>
    /// 自定义AsyncResourceFilter标记类
    /// </summary>
    public class CustomAsyncResourceFilterAttribute : Attribute, IAsyncResourceFilter
    {
        /// <summary>
        /// API异步action 执行前后
        /// </summary>
        /// <param name="context"></param>
        /// <param name="next"></param>
        /// <returns></returns>
        public async Task OnResourceExecutionAsync(ResourceExecutingContext context, ResourceExecutionDelegate next)
        {
            Console.WriteLine("======Before======CustomAsyncResourceFilterAttribute.OnResourceExecutionAsync================");
            await next.Invoke();
            Console.WriteLine("======After======CustomAsyncResourceFilterAttribute.OnResourceExecutionAsync================");

        }
    }
}

测试API Action

　　　　 /// <summary>
        ///  GET AOP测试 AsyncResourceFilter
        /// </summary>
        /// <returns></returns>
        [HttpGet()]
        [Route("ResourceFilter/CustomAsyncResourceFilter")]
        [CustomAsyncResourceFilter]
        public IActionResult GetSomeThing()
        {
            return new JsonResult(new ApiResut<String>()
            {
                Success = true,
                Data = "AOP AsyncResourceFilter 测试"

            });
        }