C＃清洁写重试逻辑的方式？

本文介绍了C＃清洁写重试逻辑的方式？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

有时候予有需要之前放弃重试操作几次。我的code是这样的：

Occasionally I have a need to retry an operation several times before giving up. My code is like:

int retries = 3; while(true) { try { DoSomething(); break; // success! } catch { if(--retries == 0) throw; else Thread.Sleep(1000); } }

我想改写这个在一般的重试功能，如：

I would like to rewrite this in a general retry function like:

TryThreeTimes(DoSomething);

是否有可能在C＃中？会是什么code为 TryThreeTimes（）的方法？

推荐答案

毛毯catch语句，简单地重试相同的呼叫，如果作为一般的异常处理机制可能是危险的。话虽如此，这里是一个lambda为基础的重试的包装，你可以用任何方法来使用。我选择因素重试的次数和重试超时出作为多一点灵活性参数：

Blanket catch statements that simply retry the same call can be dangerous if used as a general exception handling mechanism. Having said that, here's a lambda-based retry wrapper that you can use with any method. I chose to factor the number of retries and the retry timeout out as parameters for a bit more flexibility:

public static class Retry { public static void Do( Action action, TimeSpan retryInterval, int retryCount = 3) { Do<object>(() => { action(); return null; }, retryInterval, retryCount); } public static T Do<T>( Func<T> action, TimeSpan retryInterval, int retryCount = 3) { var exceptions = new List<Exception>(); for (int retry = 0; retry < retryCount; retry++) { try { if (retry > 0) Thread.Sleep(retryInterval); return action(); } catch (Exception ex) { exceptions.Add(ex); } } throw new AggregateException(exceptions); } }

现在您可以使用此工具方法来执行重试逻辑：

You can now use this utility method to perform retry logic:

Retry.Do(() => SomeFunctionThatCanFail(), TimeSpan.FromSeconds(1));

或

Retry.Do(SomeFunctionThatCanFail, TimeSpan.FromSeconds(1));

或

int result = Retry.Do(SomeFunctionWhichReturnsInt, TimeSpan.FromSeconds(1), 4);

或者，你甚至可以使一个异步过载。