基本的使用方式可以去GitHub上看，这里只介绍如和与polly联合起来使用，要达到这样一个目的
HelloAsync有可能会抛异常，若执行失败就降级执行HelloFallbackAsync 方法
注意 方法标注[HystrixCommand]并且是 virtual 标注
创建拦截器
[AttributeUsage(AttributeTargets.Method)] ???public class HystrixCommandAttribute:AbstractInterceptorAttribute ???{ ???????private string fallbackMethod; ???????public HystrixCommandAttribute(string fallbackMethod) ???????{ ???????????this.fallbackMethod = fallbackMethod; ???????} ???????public override async Task Invoke(AspectContext context, AspectDelegate next) ???????{ ???????????try ???????????{ ???????????????await next(context); ???????????} ???????????catch (Exception) ???????????{ ???????????????Console.WriteLine("出错"); ???????????????//1获得降级方法 ??????????????var fallback = context.Implementation.GetType().GetMethod(fallbackMethod); ???????????????//2调用降级方法 ???????????????var returnVal =fallback.Invoke(context.Implementation, context.Parameters); ???????????????//3把降级方法的返回直返回 ???????????????context.ReturnValue = returnVal; ???????????????//throw; ???????????} ???????} ???}编写需要被代理拦截的类
public class Person{ ????????[HystrixCommand(nameof(HelloFallbackAsync))] ???????public virtual async Task<string> HelloAsync(string name){ ???????????Console.WriteLine("name" +name); ???????????throw new Exception("i am ex"); ???????????return "ok"; ???????} ???????public virtual async Task<string> HelloFallbackAsync(string name){ ???????????Console.WriteLine("执行失败" +name); ???????????return "fail"; ???????} ???}创建
???ProxyGeneratorBuilder proxyGeneratorBuilder = new ProxyGeneratorBuilder(); ???using (IProxyGenerator proxyGenerator = proxyGeneratorBuilder.Build()) ???{ ???????var p = proxyGenerator.CreateClassProxy<Person>(); ???????var re = p.HelloAsync("rup").Result; ???????Console.WriteLine(re); ???}微服务入门06AspectCore ?Aop
原文地址：https://www.cnblogs.com/Amayer/p/9690447.html