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# ResultFilter 同步实现

public class CustomResultFilterAttribute : Attribute, IResultFilter
    {
        public void OnResultExecuted (ResultExecutedContext context)
        {
            Console.WriteLine ("结果过滤器之后");
        }
        public void OnResultExecuting (ResultExecutingContext context)
        {
            Console.WriteLine ("结果过滤器之前");
        }
    }
标注 action
[Route ("/api/[action]")]
public class ResultController:ControllerBase
{
      public ResultController () 
      {
         Console.WriteLine ("构造函数");
      }
      [HttpGet]
      [CustomResultFilterAttribute]
      public  string ResultIndex () 
      {
          Console.WriteLine ("方法执行");
          return "resultFilter";
      }
}
# 运行项目
# 结论
控制器构造函数-》调用的API(action)-》OnResultExecuting-》OnResultExecuted
# ResultFilter 异步实现
public class CustomAsyncResultFilterAttribute : Attribute, IAsyncResultFilter
    {
        public async Task OnResultExecutionAsync (ResultExecutingContext context, ResultExecutionDelegate next)
        {
            Console.WriteLine ("结果过滤器之前");
            await next.Invoke ();
            Console.WriteLine ("结果过滤器之后");
        }
    }
# ResultFilter 在业务上能用来做什么
对接口(action)中的结果进行处理。例如将返回的结果变成统一的json格式
处理之前的结果
public class CustomResultFilterAttribute : Attribute, IResultFilter
    {
        public void OnResultExecuted (ResultExecutedContext context)
        {
            Console.WriteLine ("结果过滤器之后");
        }
        public void OnResultExecuting (ResultExecutingContext context)
        {
            dynamic result = context.Result;
            context.Result = new JsonResult (new Result 
            {
                Data=result.Value,
                Code=200,
                Msg="success"
            });
            Console.WriteLine ("结果过滤器之前");
        }
    }
    public class Result
    {
        public string Msg { get; set; }
        public int Code { get; set; }
        public object Data { get; set; }
    }
处理之后的结果