C# Retry库

比如网络访问或硬件参数设置需要重试，可引用gunet上的Polly库。

同步方式（每次重试有不同的时间间隔）

            var polly = Policy.Handle<Exception>().WaitAndRetry(new[] { new TimeSpan(0, 0, 1), new TimeSpan(0, 0, 2), new TimeSpan(0, 0, 3) }, (ex, t, retryCnt, context) => {
                Debug.WriteLine($"{ex.Message}, {t}, {retryCnt}");
            });
            polly.ExecuteAndCapture(() => {
                Thread.Sleep(1000);
                var random = new Random();
                var v = random.Next(0, 10);
                if (v < 50)
                    throw new Exception("V < 50");
                Debug.WriteLine($"polly.ExecuteAndCapture {Thread.CurrentThread.ManagedThreadId}");
            });

异步方式（每次重试有不同的时间间隔）

            var polly = Policy.Handle<Exception>().WaitAndRetryAsync(new[] { new TimeSpan(0, 0, 1), new TimeSpan(0, 0, 5), new TimeSpan(0, 0, 10) }, (ex, t, retryCnt, context) => {
                Debug.WriteLine($"{ex.Message}, {t}, {retryCnt}  ThreadID={Thread.CurrentThread.ManagedThreadId}");
            });
            polly.ExecuteAndCaptureAsync(async () => {
                await Task.Run(() => {
                    Thread.Sleep(1000);
                    var random = new Random();
                    var v = random.Next(0, 10);
                    if (v < 50)
                        throw new Exception("V < 50");
                    Debug.WriteLine($"polly.ExecuteAndCapture {Thread.CurrentThread.ManagedThreadId}");
                });
            });