polly异常重试、熔断

//处理ArgumentException，NullReferenceException异常
            //ISyncPolicy policy = Policy
            //    .Handle<ArgumentException>()
            //    .Or<NullReferenceException>()
            //    .Fallback(cancellToken=> {
            //    Console.WriteLine("出错");
            //});

            ////处理包含"没有姓名参数"ArgumentException的异常
            //ISyncPolicy policy = Policy
            //    .Handle<ArgumentException>(argEx => (argEx.Message == "没有姓名参数"))
            //    .Fallback(cancellToken => {
            //    Console.WriteLine("出错");
            //});

            ////重试3次
            //ISyncPolicy policy = Policy
            //    .Handle<Exception>()
            //    .Retry(3);//.RetryForever()//一直试

//间隔1s、5s、10s、20s、1min各重试一次
Polly.Policy.Handle<WebException>().WaitAndRetry(
                  new[] {
            TimeSpan.FromSeconds(1),
            TimeSpan.FromSeconds(5),
            TimeSpan.FromSeconds(10),
            TimeSpan.FromSeconds(20),
            TimeSpan.FromMinutes(1)
        },(ex, ts, i, context) =>{Console.WriteLine("出错");});

            //重试3次,每次等待2秒
            ISyncPolicy policy = Policy
                .Handle<Exception>()
                .WaitAndRetry(3, i => TimeSpan.FromSeconds(1));

            //多次出错，断路保护
            ISyncPolicy policyCir = Policy
               .Handle<Exception>().CircuitBreaker(2, TimeSpan.FromSeconds(5));
            policy = policy.Wrap(policyCir);

            policy.Execute(() =>
            {
                Console.WriteLine("任务开始");
                throw new Exception("没有姓名参数");
            });